CN102097258B - Switching device having a contact welding indicator - Google Patents

Abstract

A switching device in the invention has movable main contacts (47, 48) supported by contact arms (203, 204), a tripping mechanism (51), a manually-resetting device (40), a tripping device (41) acting on the contact arms via the tripping mechanism, and a mechanism for instructing welding of the contacts, the switching device is characterized in that, the instruction mechanism comprises a locking bar (231) coupled to the contact arms to locate a locking position of the locking bar when the contacts close, the locking bar (231) is provided with a hook (243) disposed to fix the manually-resetting device (40) in a middle position when the locking bar is at the locking position and after tripping of the switching device.

Description

The switching device with contact welding indicator

Technical field

The present invention relates to for electric equipment, is generally the protective device field of low-voltage equipment.These devices are generally used for and are arranged in electric terminal distribution board.

Especially, the present invention relates to switching device, this switching device comprises:

Movable main contact, it is supported by contact arm and coordinates with static main contact in make position,

Tripping mechanism, it acts in described contact arm,

Manual reseting device, it acts in described contact arm via described tripping mechanism and can occupy the position of the setting that represents described device and represent the position that described device is threaded off,

Trip gear, it acts in described contact arm via described tripping mechanism, and

Be used to indicate the mechanism of described main contact melting welding, it acts on described manual reseting device so that described manual reseting device occupies centre position to show to exist described main contact melting welding.

Background technology

French patent application FR2649826 describes a kind of circuit breaker that is provided with controlling organization, comprise the reset handle that can activate between limit closure and open position, be provided with the tripping mechanism of the release lever on the contact that acts on described circuit breaker and the melting welding of the described contact that shows to coordinate with described release lever handle is being stopped at during in closed melting welding state to the indicating device in centre position when contact.

A shortcoming of such circuit breaker is that the indicating device that is used to indicate the closed melting welding state of contact is actuated by being positioned at the tripping mechanism of the described contact certain distance of distance.

French patent application FR2,829,869 describe a kind of electric switch equipment, comprise movable contact conductive arm, contact pressure spring and are applied to power on described arm or according to minimize the magnetic device of this power at the mobile current value of described arm for improving by contact pressure spring.

A shortcoming of a kind of electric switch equipment is like this that magnetic device comprises two magnetic circuits, and one of them is movable, so they implement complicated.

Summary of the invention

The object of the invention is to make up by proposing a kind of switching device the shortcoming of the switching device of prior art, this switching device comprises:

Movable main contact, it is supported by contact arm and coordinates with static main contact in make position;

Tripping mechanism, it acts in described contact arm;

Manual reseting device, it acts in described contact arm via described tripping mechanism and can occupy the position of the setting that represents described device and represent the position that described device is threaded off;

Trip gear, it acts in described contact arm via described tripping mechanism; And

Be used to indicate the mechanism of the melting welding of described main contact, it acts on described manual reseting device so that described manual reseting device occupies centre position to show to exist the melting welding of described main contact.

It is characterized in that of described device, described indicating mechanism comprises locking-bar, this locking-bar is provided with the movable part that acts in described contact arm described locking-bar is positioned to snap close position when described main contact is closed, described locking-bar is provided with lock catch arm, this lock catch arm is with hook, and this hook is arranged as so that manual reseting device is fixed on to described centre position after described device is threaded off during in described snap close position when described locking-bar.

Described tripping mechanism preferably acts on movable main contact via the control actuator with electromagnet, and this activity main contact is coupled by the movable part of contact holder and described control actuator.

The movable part of snap close joystick is preferably coupled by contact holder and contact arm.

According to an embodiment, the movable part of locking-bar is the second arm.Contact holder is in fact preferably formed by fixture, and the second knee-joint of contact arm and locking-bar is combined in this fixture.The second arm of locking-bar preferably includes when main contact is closed by the portion that only stops on piece that only stops that is pressed in contact holder.

According to an embodiment, manual reseting device comprises that described hanging locking device can not approach when described manual reseting device mediates for coordinating the hanging locking device with switching device described in snap close with padlock annex.Hanging locking device preferably includes for receiving the opening of the hasp of padlock.

According to a feature, switching device comprises: the movable contact arm of being made by electric conducting material, and its movable support main contact is to open or closed described movable main contact, contact pressure spring, it acts in described contact arm to apply contact pressure between described movable main contact and static main contact, and the magnetic with the opening of U-shaped profile is strengthened loop, it is associated with described contact arm, described magnetic is strengthened loop and is formed by ferromagnetic material, and be arranged as so that at least a portion in the length of described contact arm covers this contact arm when described movable main contact is closed, so that contact pressure is strengthened described in when short-circuit current flows in described contact arm, this switching device is characterised in that, described magnetic is strengthened loop and is fixedly mounted in described switching device about described static main contact, and it is arranged as with respect to described contact arm so that contact arm is strengthened the predetermined overshoot distance of loop overshoot from magnetic described in when described movable main contact is closed.

According to another feature, in the described length part of contact arm of being strengthened loop covering by magnetic, overshoot range averaging gets up for 0.1-2 millimeter.

According to another feature, in the length part of contact arm of being strengthened loop covering by magnetic, overshoot range averaging gets up between 0.5 and 1 millimeter.

According to another feature, magnetic is strengthened loop and is had and be parallel to the yardstick between 20 and 35 millimeters that is included in that contact arm length direction limits.

According to another feature, magnetic reinforcement loop has the yardstick between 4 and 7 millimeters that is included in the direction restriction of the length perpendicular to contact arm.

According to another feature, contact arm is formed by blade, and this blade is arranged as so that its two maximized surfaces are strengthened the Liang Ge branch of the U that the profile in loop forms substantially in the face of the magnetic that is associated with described contact arm.

According to another feature, overshoot distance is more than or equal to the wearing clearance that main contact is formed on contact pads wherein.

According to another feature, magnetic is strengthened loop and directly in the contact arm being associated with it, is interacted, to strengthen the contact pressure when short-circuit current flows in described contact arm.

Accompanying drawing explanation

Other advantage and feature are by from only providing with the object of indefiniteness example and the description of specific embodiment illustrated in the accompanying drawings and become clearer of the present invention below.

Figure 1A and 1B are the perspective views according to switching device of the present invention.

Fig. 2 is the explanatory view that the critical piece of switching device is shown.

Fig. 3 A and 3B are the perspective views of heat and magnetic trip gear.

Fig. 4 is the perspective view that is illustrated in especially control actuator, tripping mechanism and trip gear in housing.

Fig. 5 is the cross sectional view according to switching device of the present invention.

Fig. 6 A and 6B are the perspective views that trip gear, tripping mechanism and control actuator are shown.

Fig. 7 A and 7B are the perspective views that a part for reset button and tripping mechanism is shown.

Fig. 8 is the fragmentary, perspective view of actuating unit.

Fig. 9 A and 9B illustrate according to the electric control circuit of the control actuator of different embodiment.

Figure 10 A, 10B and 10C are the perspective views that comprises the actuating unit of controlling actuator and base portion thereof.

Figure 11 A and 11B are schematically illustrated strengthens loop in the contact arm of the make position of main contact and the open position of main contact and the magnetic being associated with contact arm respectively.

Figure 12 is illustrated in and does not have contact arm with respect to described magnetic, to strengthen under two kinds of situations of overshoot (overshoot) in loop by magnetic, strengthening the powerful variation of opening distance with respect to the main contact in X-axis that adds that loop applies in Y-axis.

Figure 13 A, 13B and 13C arrange the perspective view of the switching device of (set), dropout and snap close after main contact welding.

Figure 14 illustrate comprise be placed in current limiting device feedline circuit load-side according to the power distribution equipment of switching device of the present invention.

Embodiment

With reference to Figure 1A and 1B, switching device 1 is contained in housing, and this housing is provided with two flange plates 11 and 12, and these two flange plates 11 and 12 support the main panel 14,15 of described device.Can be using these two flange plates respectively as housing and lid.Main panel 14,15 is substantially parallel to each other.Switching device 1 comprises the rear portion that is provided with device 17A and 17B, and this device 17A and 17B be the supporting rail in electrical panel for fixing described switching device.Such several electric switchgear can be by for previous and stationary device 17A and 17B are fixed to the identical support portion of identical panel via their main panel 14,15 one by one by a rear adjacency by these several electric switchgears.

In the embodiment shown, the range normalization between main panel 14,15, and be substantially equal to the standardized electrode distance that number of electrodes is multiplied by 9 millimeters, namely, the distance between panel 14,15 is substantially equal to or is slightly less than 18 millimeters.Such switching device has standardized profile, and it makes them can be fixed to the support portion with identical standard.Thereby standardization distance and profile give switching device 1 module attribute.

As found out from Figure 1A, 1B and 2, switching device 1 comprises the connection panel 21,22,23 that is provided with the opening 25,26,27,28 that allows to approach splicing ear.Switching device 1 is two electrodes, and comprises phase input terminal 31 and the phase output terminals 32 of power or circuitry phase, and the neutral input end of neutral circuit 34 and neutral lead-out terminal 35.Terminal 31,32 is contained in respectively after opening 25,26, and terminal 34,35 is contained in respectively after opening 27,28.The outside opening of opening 25-28 that makes it possible to approach these terminals is to connecting panel 21,22, away from device.This device is also provided with two control terminals 37,38, and this control terminal 37,38 can approach to the opening 29,30 connecting on panel 23 via outside opening.By different central divider 39 separately, described central divider 39 is independent of two flange plates 11,12 of housing and is fixedly mounted on described flange plate for circuitry phase and neutral circuit.If find out from Figure 1A and 1B, switching device 1 also comprises the front part that is equipped with reset button 40.Switching device also comprises the second manual trip push button 42.When switching device is arranged in electrical panel, user can approach this two buttons 40 and 42.In other embodiment not illustrating, these two buttons can be substituted by handle, and this handle makes user can carry out reset and hand tripping function simultaneously.Indicating device 44 is by reset button 40 to show whether switching device is set up, and in this case, indicator for displaying red color, if or switching device dropout, the in this case green color of indicator for displaying.

With reference to Fig. 2, the circuitry phase of switching device 1 extends between phase input terminal 31 and phase output terminals 32.Neutral circuit for this part extends between neutral input end 34 of neutral circuit and neutral lead-out terminal 35.Circuitry phase comprises the trip gear 41 that is electrically connected to phase input terminal 31 and illustrates in greater detail in Fig. 3.In other embodiments, trip gear can be electrically connected to phase output terminals 32.These trip gears comprise thermal release device 43 and the magnetic trip gear 45 being connected in series on circuitry phase.These trip gears 41 act on respectively on the movable main contact 47,48 of circuitry phase and neutral circuit indirectly.Opening by dropout chain of these contacts realizes, and this dropout chain comprises tripping mechanism 51, the control actuator 53 of being powered by rectifying device 55 of trip free and acts on the second mechanism 57 on movable contact 47,48.In switching device of the prior art, free tripping mechanism used refers to and can be independent of operating means, is reset button in this application, and the mechanism activateding.Therefore such mechanism can be threaded off and main contact is opened, even in the situation that reset button keeps depressing.

If find out in Fig. 2, tripping mechanism 51 can also be via button 40 and via the second button 42 actions, and described button 40 can be reset switching device, and described the second button 42 can make switching device hand tripping.This tripping mechanism 51 coordinates with control actuator 53 via the switch 59,169 of switching device inside.Term internal switch represents the switching device of any type, no matter switch motion is carried out by mechanical part or electronic unit.Advantageously, internal switch 59,169 comprises the movable contact 59 of controlling, movable contact bridge or the flexible blade for example described in the back.Like this, while carrying out hand tripping while occurring to thread off or by the second button when in electric fault, control contact 59 and open indirectly to open movable contact 47,48.The reset of switching device is carried out by reset button 40, and this reset button Closed control contact 59 is with closed movable contact 47,48, and wherein said control contact makes it possible to control by apply suitable voltage between terminal 37 and 38.If there is no voltage between control terminal 37 and 38, movable contact remains on open position.

As found out, for controlling the input of the rectifying device 55 of actuator 53 power supplies, via two control terminals 37,38, be connected to unshowned alternating-current voltage source in Fig. 2.In other embodiment not illustrating, this power supply of rectifying device 55 can be by directly providing in switching device inside with being connected of neutral circuit with circuitry phase.In this case, switching device will not comprise any control terminal, and the control of described device, especially control the control of actuator 53, the communication interface that the control electronic devices and components via inner with being placed in described device are associated and carrying out.This communication interface can be hard wire or soft cloth line, for example radio type or nearly magnetic Field Coupling type.

Switching device is as shown in Figure 2 particularly suitable for being arranged on the load-side of current limiting device.Controlling actuator 53 is placed in the fact in dropout chain and realizes and having electric fault for example to open main contact and switch described main contact by local or remote control command when short circuit or overload in automatic mode.More accurately, control that actuator 53 is placed between movable main contact 47,48 and trip gear 41 so that after short circuit or after overload or described in retinue's control command movable contact 47,48 open via this control actuator necessity occur.Compare with the switching device of mainly carrying out by free tripping mechanism and the possible striker (striker) being placed on magnetic trip gear of wherein threading off, the response time of opening movable main contact 47,48 can be controlled, or even increases.In the switching device of prior art, free tripping mechanism used refers to and can be independent of operating means namely reset button and the mechanism that activated.Therefore such mechanism can be threaded off and cause main contact to be opened, even in the situation that reset button keeps depressing.By controlling actuator 53 and be arranged in the dropout chain of switching device, make the delay of opening of movable main contact 47,48 can be able to controlled and/or regulate.When switching device is placed in the load-side of short-circuit current limiting device, the opening of described switching device postpones to make can be before opening movable main contact 47,48 to line side restraint device, to have limited always etc., or even elimination, short circuit current.This causes when short circuit occurs, much lower by the thermal stress of main contact 47,48 experience and electronic stress ratio thermal stress and electronic stress that wherein main contact 47,48 initiatively participates in by opening early when the high electric current in traditional device of interrupting short circuit.Therefore, be appreciated that according under the relevant situation of the switching device with line side restraint device of the present invention, when short circuit occurs, main contact aging is owing to opening that main contact occurs being delayed with respect to circuit peak value and very low.Therefore the short-circuit protection function of switching device is simplified.For example, in this switching device, no longer force to need the existence of arc control device.And, between movable main contact 47,48 and tripping mechanism 51, do not exist direct link to produce and simplify and more flexible dropout chain.Especially, be different from circuit breaker of the prior art, tripping mechanism 51 does not experience fracture strength, and this has reduced the restriction of elasticity, impact strength and heat projection endurance aspect for mechanism components greatly.Finally, the actuating of main movable contact only can be by controlling that actuator is carried out rather than by the fact that different mechanism of two of switching for rated current carry out for short circuit disconnects, the complexity of device being reduced.In fact, no longer need on the one hand tripping mechanism and control the complicated machinery handing-over between actuator between movable main contact and on the other hand of management.This simplification further makes the performance of handoffs under rated current obviously to improve, and does not affect the relevant disconnection performance being formed by line side according to the present invention restraint device and load side switch device.

With reference to Fig. 3 A and 3B, thermal release device 43 forms by bimetal strip in fact, namely, and by thering are the different metal of the different coefficients of expansion or two blades of alloy.Bimetal strip comprises the free end 61 that is electrically connected to movable contact 47 by conductive braided fabric thing 62 (Fig. 4).The overload current that flows in bimetal strip 43 causes the heat of this free end 61 to rise and deflection.This deflection of bimetal strip 43 represents by arrow 63.When this overload current is during higher than predetermined heat dropout threshold value, this deflection of the free end 61 of bimetal strip carrys out the opening of movable main contact 47,48 of actuation switch device by tripping mechanism 51.The stiff end 65 of bimetal strip 43 is electrically connected to magnetic trip gear 45.Thereby thermal release device namely substantial bonding jumper 43 makes can thread off when the relatively slow electric fault that has moderate strength is for example transshipped.

As found out in Fig. 3 A and 3B, magnetic trip gear 45 comprises around the coil 71 that is placed in the plunger core in sheath 73, when plunger core described in electric current is when described coil midstream is moving moves.Trip gear also comprises the magnetic flux that ferromagnetic shell 79 produces with the current flowing of optimizing in coil.One end 75 of coil is welded direct to ferromagnetic shell 79 so that the moving electric current of coil midstream flows equally in a part for described shell.Thereby this end 75 of coil 71 is electrically connected to the stiff end 65 of bimetal strip 43 by means of the part of ferromagnetic shell 79 that is formed for the support portion of bimetal strip 76.In particularly advantageous mode, the support portion of bimetal strip 76 becomes the single integral part of being made by ferromagnetic material with hull shape.Two functions are advantageously realized in bimetal strip support portion, namely, and the function of the magnetic flux that the function that the restriction of bimetal strip 43 is supported and elimination are produced by coil 71.Advantageously, therefore bimetal strip 43, bimetal strip support portion and coil 71 are directly connected in series in current circuit.

The other end 77 of coil 71 is connected to phase input terminal 31 (Fig. 4).Plunger core is placed in its sheath 73 with in the translational motion between (rest) position and extended position of not working.Plunger core is passed through ferromagnetic shell 79 via opening 81 in a side.One end of plunger core comprises when the snap close ring 83 coordinating with tripping mechanism surpasses magnetic dropout threshold value with the electric current mobile in coil 71 controls opening of contact 59 actuating activity main contacts 47,48 by activity.Circuit in coil 71 is during lower than dropout threshold value, and regulating spring 85 makes plunger core can remain on inoperative position.This regulating spring 85 is calibrated to need only electric current and just keeps plunger core in its inoperative position lower than magnetic dropout threshold value.Regulating spring 85 acts on by being placed in only stopping in portion that snap close ring 83 on the free end of plunger core forms in a side, acts on the edge of opening 81 of ferromagnetic shell 79 on opposite side.Magnetic trip gear 45 therefore make exist high-intensity fast or moment electric fault for example surpass 10 times of rated current, for example can thread off during pure short circuit.

More accurately, in the embodiment as shown in Fig. 3 A and 3B, the ferromagnetic shell 79 of magnetic trip gear 45 is formed in folding bonding jumper 86.The first 87 of bar 86 is around coil 71 and magnetic flux can be flowed.This first 87 has C shape profile.The second portion 89 of bar 86 is for by being welded and fixed the stiff end of bimetal strip 43.Thereby this second portion 89 of bar not only makes the stiff end of bimetal strip can be supported, and electric current can be flowed between described bimetal strip 43 and the coil 61 of magnetic trip gear 45.Thereby the structure of trip gear is simplified.

Thermal release device 43 comprises that adjustment screw 88 is for regulating the heat dropout threshold value of bimetal strip.In particularly advantageous mode, this adjustment screw is directly installed on folding bonding jumper 86 so that it clamps the elbow 90 towards stiff end 65 formation of bimetal strip by folding bonding jumper 86 when tightening.In this way, the free end that tightens towards or move away from tripping mechanism bimetal strip of screw.Directly on heat dropout sub-component and the housing assembling adjustment screw 88 that is independent of switchgear device be particularly advantageous because it has improved degree of regulation and restriction in real time regulates drift.

In the embodiment as shown in Fig. 3 A and 3B, trip gear, comprises thermal release device 43 and magnetic trip gear 45, forms single independent sub-component, and this sub-component can be assembled in switching device as commercial unit independently.In other words, thermal release device 43 and magnetic trip gear 45 form the same trip unit of switching device.This configuration of sub-component or detachable trip unit form is conducive to the assembling of switching device.

As can be as can be seen from Figure 4, thermal release device 43 and magnetic trip gear 45 be placed in housing side by side in being roughly parallel to the same level that is connected panel 21-23.In other words, thermal release device 43 and magnetic trip gear 45 are placed in housing so that there is at least one plane, and this plane parallel is in connecting panel 21-23, thus cutting thermal release device 43 and magnetic trip gear 45 the two.

More accurately, if find out in Fig. 3 A, 3B and 4, the stiff end 65 of bimetal strip 43 is fixed to the stiff end of coil 71 by the second portion 89 of the bar of the ferromagnetic shell 79 of formation magnetic trip gear 45.The part of the free end 61 of bimetal strip 43 is placed between the two ends 75,77 of coil 71 of magnetic trip gear.In other words, between two plane P 1 of the connection panel 21-23 of bimetal strip in the limiting unit that is parallel to magnetic trip gear, P2, extend.And the deflection of bimetal strip 43 occurs in the plane that is parallel to plunger core motion and in the direction that is approximately perpendicular to the motion of plunger core.By this arrangement, the volume being occupied by the trip gear 41 in the plane of main panel 14,15 that is parallel to switching device is restricted.This configuration of trip gear 43,45 obviously reduces the space that in housing, trip gear occupies.This arrangement makes trip gear 43,45, tripping mechanism 51 and controls actuator 53 can be positioned in the identical plane of the main panel 14,15 that is roughly parallel to switching device equally.Thereby the volume of the switching device in the plane perpendicular to main panel 14,15 is restricted, between its described main panel that makes to note, can guarantee the distance of 18 millimeters.The deflection that it should be noted that bimetal strip 43 also occurs in the plane that is parallel to main panel 14,15 and in the direction of the direction of motion of plunger core 73 that is approximately perpendicular to magnetic trip gear 45.

This compact Layout mode of trip gear 41 becomes possibility by tripping mechanism 51 Main Functions that are associated with described trip gear for the translation of direction of actuation being roughly parallel to the described tripping mechanism 51 of the direction of actuation of controlling actuator.Therefore tripping mechanism 51 can locate to act directly on the internal switch that comprises movable control contact 59 and static control contact 169 by controlling actuator 53, as shown in Fig. 9 A and 9B, wherein the movable contact 59 of controlling can be closed, and described static control contact 169 is supported by the base portion 159 of described control actuator.

Advantageously, tripping mechanism 51, trip gear 41 and control actuator 53 are arranged in central divider 39, and separating part 39 physically separates circuitry phase form from neutral circuit the removable unit of the flange plate 11,12 that is independent of housing.This makes the assembling of product easy especially, once because tripping mechanism 51, trip gear 41 and control actuator 53 have been arranged in central divider 39, two flange plates 11,12 of housing only need be closed again in each side of described separating part.

With reference to Fig. 6 A and 6B, tripping mechanism 51 is included in the snap close 101 acting between trip gear 41 and internal switch 59,169 in contact stem 103.According to the first alternate embodiment as shown in Figure 6 A and 6B, contact stem 103 movable supports are controlled contact 59.Snap close 101 is installed as pivotal pin 104 rotations that coordinate around the housing with being placed in central divider 39, and comprises the first actuator arm 105, and this actuator arm 105 drives by the deflection of bimetal strip 43.Snap close 101 comprises the second actuator arm 107, and this second actuator arm 107 is driven by magnetic trip gear 45 concerning this part.The second actuator arm 107 is also by hand tripping button 42, or by being firmly adhered to the bar of described button, drives more precisely.The free end of the second actuator arm comprises side bolt 109, and it is inserted in the snap close ring 83 of plunger core of magnetic trip gear 45.According to another unshowned alternate embodiment, bar can be directly by being pressed on the snap close ring 83 of plunger core, and be that then the snap close ring of plunger core drives the second actuator arm by side bolt.Snap close 101 also comprises for snap close contact stem 103 and keeps contact stem 103 at the hook 111 of snap close or setting position, movable contact 59 and main contact 47,48 closures controlled in described snap close or setting position.The keep-spring 113 being placed between the second actuator arm 107 and housing remains on snap close 101 its snap close position.

Contact stem 103 is installed as around pivotal pin 115 rotations that realized by bolt 126 for this part, and described bolt is installed as in the groove of unshowned housing and slides.In the embodiment shown, contact stem 103 is rack forms.In the side about pivotal pin 115, contact stem 103 comprises lock catch arm 117, for hook 111 lockings with snap close 101 to keep described bar by snap close or setting.On the opposite side about pivotal pin 115, contact stem 103 comprises actuating arm 119, and the movable contact 59 of controlling is placed on this actuating arm 119.According to unshowned another alternate embodiment, the movable contact 59 of controlling is by comprising that the flexible elastic blade that is arranged on the fixed arm on the base portion of controlling actuator forms, and when tripping mechanism is in setting position and actuating arm 119 free end of this flexible resilient blade when being pressed on flexible resilient blade closes on static control contact 169.When contact stem 103 locked or while arranging by snap close 101, internal switch 59,169 closures.

As found out in Fig. 7 A and 7B, tripping mechanism 51 is further included in the drive rod 121 that its one end is firmly adhered to reset button 40.This drive rod 121 can drive contact stem 103 by pressing reset button 40 or discharging described button between tip position and bottom position in translation.Therefore drive rod 121 is installed as on the sliding part of unshowned housing and slides.More accurately, drive rod 121 is firmly adhered to buttonhole 133 at its other end, and its latching function will further be described.The sliding part 108 that the side direction part of this buttonhole 133 is slided in the bolt 126 of contact stem 103 is engaged in the same grooves of housing wherein.Drive rod 121 comprises on the top section that is placed in sliding part 108 and in order to press the portion that only stops 129 on piece 127 that only stops of contact stem 103.Back-moving spring 131 is as shown in Figure 6 A and 6B placed between the fixing point (Fig. 4) and reset button 40 of housing, with the described button that promotes drive rod 121 when contact stem 103 release and be firmly adhered to described bar to tip position.When contact stem 103 is passed through snap close 101 snap close, back-moving spring 131 also promotes drive rod 121 to tip position, thereby makes contact stem 103 turn to the make position of controlling contact 59.In a rear situation, what contact stem 103 was pressed in the portion that only stops 129 on the sliding part 108 of drive rod 121 of being placed in only stops piece 127, and it makes described bar can turn to its snap close position, the movable make position of contact 59 in it of controlling in this snap close position.Thereby movable control contact 59 to the rotation of its make position by being applied to the pressure on the lock catch arm 117 of contact stem 103 by snap close 101 and being obtained by be applied to the counter-pressure of the portion that only stops 129 on piece 127 that only stops by spring 131.At previously described buttonhole 133, by lock catch part 125, be fixed to the end of drive rod 121.Not only fixedly buttonhole 133 is to drive rod 121 for this lock catch part 125, and locking is firmly adhered to the bolt 110 of the actuating arm 119 of contact stem 103.Bolt 110 is arranged as so that can be by lock catch part 125 lockings when contact stem 103 forwards its unlocked position to.Be firmly adhered to that the inclined-plane 112 of housing and the top section of contact stem 103 coordinate so that bar forwards its unlocked position to described in when reset button 40 and the drive rod 121 that is firmly adhered to described button are positioned at tip position.By by being pressed in reset button 40, therefore contact stem 103 and the control contact 59 that is firmly adhered to this contact stem are driven to bottom position, thereby keep forwarding to the described contact stem of its unlocked position.When contact stem 103 and drive rod 121 are during in bottom position, lock catch arm 117 has moved through the hook 111 of snap close 101.After button 40 has discharged, contact stem 103 is driven into tip position by back-moving spring 131 until lock catch arm 117 locking hooks 111.This bolt 110 that causes being firmly adhered to contact stem 103 departs from and drive rod 121 moves until it is positioned at the position in centre position from lock catch part 125, in described centre position, what contact stem 103 was pressed in the portion that only stops 129 on sliding part 108 of being placed in only stops piece 127.

Above-described tripping mechanism 51 operates in the following manner.When occurring to thread off along with electricity overload, instant heating is threaded off, the free end 61 of bimetal strip 43 by the power that is pressed on the first actuator arm 105 and offsets spring 113 to drive snap close 101 to rotate.In an identical manner, when threading off along with short circuit, magnetic is threaded off, and the plunger core of magnetic trip gear 45 is offset spring 113 power by snap close ring 83 and bolt 109 moves the second actuator arm 107 to drive snap close 101 to rotate.Again in the same manner, by pressing on hand tripping button 42, the second actuator arm 107 moves by bar, thereby the power of offsetting spring 113 is to drive snap close 101 to rotate.In three kinds of all situations, the rotating drive hook 111 of snap close 101 is to the position that discharges contact stem 103.This causes contact stem 103 to turn to unlocked position, thereby causes controlling the open position that contact 59 moves to it.Meanwhile, contact stem 103 moves to its tip position by drive rod 121 and back-moving spring 131 translations.When the electric fault for dropout cause is isolated by opening of main contact 47,48, plunger core or bimetal strip and snap close 101 are returned to their initial position.This initial position makes the contact stem 103 can be by snap close after contact stem 103 resets.Reset is carried out to drive contact stem 103 to move to bottom position by pressing reset button 40.When resetting beginning, the inclined-plane 112 that is firmly adhered to housing makes contact stem 103 can remain on its unlocked position.In this obliquity of contact stem 103, the bolt 110 of actuating arm 119 can be by by being pressed in reset button 40 by lock catch part 125 lockings that are firmly adhered to drive rod 121.By pressing reset button 40, contact stem 103 and be firmly adhered to described contact stem and be therefore driven to bottom position.After button 40 has been released, contact stem 103 is driven to tip position by back-moving spring 131 until lock catch arm 117 is latched on the hook 111 of snap close 101.Contact stem 103 is then due to by hook 111 with only stop portion 129 and be applied to power in contact stem 103 and turn to the closed movable position of controlling contact 59.

If find out in Fig. 7 A, according to previously described the first alternate embodiment, the movable contact 59 of controlling is the forms with the contact bridge that is arranged on two contact pads 141 on spring blade 143.Between two contact pads 141, contact stem 103 comprises the portion that only stops 145 on piece that only stops that controls actuator 53 by being pressed in, as described below.

With reference to Fig. 8, controlling actuator 53 is electromagnets, roughly comprises ferromagnetic shell 151, the coil 153 being wound around around the coil support portion 155 of being made by insulating material and the plunger core 157 of sliding in described coil support portion inside.Ferromagnetic shell 151 is formed by two folding bars 158, and each has Liang Ge branch and has U-shaped profile.When carrying out the installation of controlling actuator 53, the end of the Liang Ge branch of each folding bar 158 is fixed to one another in the major part of their width to guarantee magnetic flux flows.More accurately, the end of folding bar 158 is bonded on and is formed in the base portion 159 and the sheath in coil support portion 155 160,162 of controlling actuator.Actuator 53 and its base portion 159 form the removable actuating unit that can be attached to switching device and assemble separately before particularly in central divider 39 thus.Thisly be mounted with the assembling that is beneficial to switching device.Plunger core 157 comprises driving extension or the bar 161 of movable main contact 47,48.When exciting current flows in coil 153, plunger core 157 and bar 161 extend to keep movable main contact 47,48 in make position.There is no electric current in coil 153 in mobile situation, plunger core 157 and bar 161 retract to keep movable main contact 47,48 at open position.Therefore control actuator 53 is monostable type, and namely when it is no longer supplied electric power, it only comprises a settling position.This settling position of actuator is corresponding to the open position of main contact 47,48, and it guarantees safety operation.Controlling under the situation of the power cut-off on actuator 53, control the stable open position that actuator 53 spontaneously turns back to it.

With reference to Fig. 9 A and 9B, control the control circuit of actuator 53, label is 164,166 respectively, comprises two Alternating Current Power Supply terminals 163.Visible control terminal 37,38 in these terminal corresponding diagram 2.In an illustrated embodiment, control actuator 53 by be connected to the external power source of power supply terminal 163 by remote control switch 165.In unshowned other embodiment, power supply can by the circuitry phase with switching device inside, being connected in housing obtains with neutral circuit, and in this case, switching device will comprise communication interface, but not power supply terminal 163.

At the control circuit 164,166 shown in Fig. 9 A and 9B, further comprising rectifying device 167, is diode bridge in this case, and it is connected to power supply terminal 163.Rectifying device makes the alternating voltage on power supply terminal 163 can be converted to the voltage after rectification.In unshowned other embodiment, rectifying device can be placed in switching device outside, if or to control voltage be direct current or unidirectional attribute, can there is no rectifying device.

At the control circuit 164,166 shown in Fig. 9 A and 9B, be further included in previously described movable contact 59 and the static control contact 169 controlled, the movable contact 59 of controlling can close on this static control contact 169.Coil 153 is connected to static control contact 169, and comprises that first pours in coil 171 and the second hold-in winding 173.First pours in coil 171 moves between its retracted position and its extended position for plunger core 157.The second hold-in winding 173 for this part for keeping plunger core 157 at its extended position, closed at described extended position main contact.Control circuit comprises that movable stroke stops contact 175 equally, and when movable main contact remains closed, it is restricted the heating of coil windings by reducing power consumption.More accurately, in Fig. 8, visible movable stroke stops contact 175 and is driven with the static stroke termination contact 177 away from control circuit 164,166 when the closed position of completely extending of plunger core in corresponding main contact and moved by bar 161.Stroke stop contact 177 be placed in control circuit 164,166 with restriction when movable stroke termination contact 175 is opened in coil 171,173 one or both of mobile exciting current.

First pours in coil 171 has than the less yardstick of the second hold-in winding 173, and has less impedance.The second hold-in winding 173 is applicable to storing the closed required electric power of maintenance activity main contact 47,48 to this part its yardstick.The second hold-in winding 173 has high resistance with in order to minimize exciting current during remaining closed at main contact and to limit power consumption.This exciting current for for the electric arc producing when contact 59 is opened is controlled in generation activity after threading off in hand tripping or while having electric fault enough a little less than and be low-energy.This is conducive to and promotes the Lock-out of electric current, thereby minimizes the damage of movable contact 59 and aging.

In the embodiment of Fig. 9 A, first pours in coil 171 and the second hold-in winding 173 is connected in series, and stroke stops contact 175,177 and the parallel installation of the second hold-in winding 173.When the extended position of the corresponding main contact closure of plunger core 157 in it, stroke stops that contact 175,177 is opened and exciting current flows through two coils 171,173.Therefore this exciting current is subject to having the restriction of the second hold-in winding of high impedance.

In the embodiment of Fig. 9 B, first pours in coil 171 and the second hold-in winding 173 parallel joins, and stroke stops contact 175,177 and first and pours in coil 171 and be connected in series.When the extended position of the corresponding main contact closure of plunger core 157 in it, stroke stops contact 175,177 and opens, and exciting current only flows through the second hold-in winding 173.Therefore this exciting current is subject to having the restriction of the second hold-in winding 173 of high impedance.

As found out in Figure 10 A, 10B and 10C, static control contact 169 is positioned on base portion 159.Static control contact 169 has two blades or voltage contact area 181,183 or rather, in normal running, is not namely having under electric fault in tripping mechanism arranges, and the movable pad 141 of controlling contact 59 is pressed in this blade or voltage contact area.Only stop piece 184 and be placed between two contact blades 181,183, this two contact blades 181,183 are pressed in the portion that only stops 145 of the contact stem 103 of movable support control contact 59.In the second alternate embodiment of unshowned movable control contact 59, namely, in flexible resilient blade, static control contact has single voltage contact area, and the pad that is arranged on the activity control contact in flexible blade is pressed against in this single voltage contact area.Static stroke stops contact 177 and is positioned at equally on base portion 159 concerning this part.As for regard to movable stroke stops contact 175, this contact 175 and plunger core 157 couplings.Wherein movable contact 59 and the stroke controlled stops contact 175,177 and is placed in the assembling that this structure on actuating unit is conducive to switching device.In the embodiment shown, rectifying device 167 is equally directly placed on the base portion 159 of actuating unit.Thereby be even further conducive to the assembling of switching device.

The control actuator 53 of describing in the above operates in the following manner.The open and close of movable main contact 47,48 is controlled via the remote control switch 165 outside switching device.When remote control switch 165 is closed, control that actuator 53 is supplied to electric power and movable main contact 47,48 remains closed by the plunger core 157 in extended position and bar 161.When remote control switch 165 is opened, actuator is no longer powered and movable main contact 47,48 stays open by the plunger core 157 in retracted position and bar 161.In a rear situation, remote control switch 165 is positioned at the line side of rectifying device 167, in coil mobile electric current when via rectifying device 167 by time do not eliminate immediately but reduce gradually.The low-down power consumption of actuator can reduce electric current gradually.Only, when electric current reaches decline (drop-out) current value, plunger core 157 just moves to retracted position.The number of turn of considering hold-in winding is very many, and the level of drop-out current is very low.This advantageously gives device to the short time power-off better bearing strength of the power-off of a few tens of milliseconds namely, and does not need for example any other power supply source of capacity type.Like this, under the situation of falling at the line side of rectifying device 157 short time voltage, control actuator 53 and do not move to immediately its settling position, but remain on make position, thereby guarantee that main contact remains on make position.

At switching device, be placed in the situation in the load-side feedline circuit of current limiting device, the control circuit of controlling actuator 53 provides the good bearing strength to the short supply interruption of about tens of milliseconds, and described short supply interruption can be that the load-side short circuit by another switching device causes.Therefore this short supply interruption bearing strength makes the service continuity on feeder line improve, and does not worry losing efficacy.Electric fault or after reset after described main contact closure opening of movable main contact 47,48 by activity, control contact 59 and realize.Movable control the load-side that contact 59 is placed in rectifying device 167, after electric fault, main contact 47,48 opens and by remote control switch 165, opens described contact and compare quicker.In fault, occur between effectively opening of the moment and main contact, then the opening time of main contact is less than 20 milliseconds, for example, be included between 6-15 millisecond.This operator scheme for fault is used for guaranteeing that main contact enough opens fast, and for weakening short circuit current, it is typically less than 30 times of rated current, and for this reason, line side restraint device is also non-active, and switching device outage electric current on one's own account.

As found out in Figure 4 and 5, movable main contact 47,48 is placed in respectively on two movable contact arms 203,204, and described movable contact arm 203,204 is installed as around the pivotal pin 201 on the first end of described arm and rotates.Contact arm the 203, the 204th, has the form of a blade of two first type surfaces that are installed as the main panel 14,15 that is roughly parallel to housing.Movable main contact 47,48 is fixed on the edge or thickness of contact arm 203,204, and in its principal dimensions, towards the second end of described contact arm.Contact arm 203,204 is coupled to the bar 161 of plunger core 157 by fixture or contact support portion 205, described knee-joint is combined in described fixture or contact support portion 205.Fixture 205 self is firmly adhered to the end of bar 161.The contact pressure spring 208 acting in each contact arm 203,204 can remain between movable main contact 47,48 and their corresponding static main contacts 206,207 enough pressure.More accurately, this contact pressure spring 208 is placed between the element of fixture 205 and the end of movable support main contact 47,48 contact arm 203,204.When plunger core 157 is extended, therefore contact pressure spring 208 can remain between main contact 47,48,206,207 pressure.

In embodiment as shown in Figures 4 and 5, after threading off when electric fault or opening or close commands after, the motion of movable main contact 47,48 is via identical control actuator 53 and in roughly identical with the direction of actuation of described actuator direction, be its plunger core 157 motions direction occurs.And this direction of actuation is extended perpendicular to the front panel of switching device and in the direction that is being parallel to tripping mechanism 51, this means that the compactedness of switching device improves.

In embodiment as shown in Figures 4 and 5, tripping mechanism 51 is being roughly parallel to the translation direction operation of the direction of actuation of controlling actuator 53.In other words, the direction of motion of the contact stem 103 of drive rod 121 and tripping mechanism 51 is roughly parallel to the direction of motion of the plunger core 157 of controlling actuator 53.

Movable contact arm the 203, the 204th, is made by electric conducting material.The magnetic directly coordinating with each movable contact arm 203,204 is strengthened loop 210,211 pressure between main contact 47,48,206,207 is strengthened, when particularly in movable contact arm 203,204, mobile electric current is apparently higher than the rated current of device, for example, higher than magnetic dropout threshold value, even high a lot, for example, when the short circuit current of high tens times flows.More accurately, each magnetic is strengthened loop 210,211 and is roughly had the element of being made by the ferromagnetic material with U-shaped cross section (Fig. 5), and described element is installed as and is attached to securely in housing and partly around each contact arm 203,204.In particularly advantageous mode, open in magnetic reinforcement loop, namely, bears and add powerful effective air gap by the airborne distance formation between the Liang Ge branch of U.Especially, this is different from the magnetic loop that is called closed-loop path, and to this, another is generally movable ferromagnetic part closed magnetic circuit to reduce air gap.Contact arm 203,204 advantageously by nonferromagnetic material for example copper or brass make, not change effective air gap when mobile.It is therefore fixing about static main contact 206,207 that magnetic is strengthened loop 210,211.Each contact arm 203,204 comprise be roughly parallel to magnetic strengthen loop 210,211 U-shaped section branch surface or be parallel to two side surfaces that described magnetic is strengthened the edge in loop so that described magnetic strengthen magnetic flux mobile in the U-shaped section in loop 210,211 via its side surface by described contact arm.The magnetic force that the air gap that movable contact arm makes magnetic strengthen loop about (on-the-edge) arrangement form on this edge of U-shaped section minimizes and produces maximizes.

In the illustrated embodiment, movable contact arm 203,204 is installed as and can rotates.In other unshowned embodiment, movable contact arm can move in translation.

Magnetic strengthen loop 210,211 preferably by comprise iron and silicon for example the alloy of 2% silicon make.Such component at least make when being for example the short-circuited electric current in contact arm 203,204 there is the rising front of precipitous gradient time obtain contact and strengthen faster.

When electric current flows in one of contact arm 203,204, magnetic contact is strengthened flux and is produced, and it strengthens flowing in loop 210,211 and by described contact arm at magnetic.This magnetic flux is tending towards attracting contact arm 203,204 downwards and the movable main contact of described contact arm 47,48 is pressed on static main contact 206,207.Magnetic is strengthened loop 210,211 thereby is minimized in the risk that forms electric arc between movable main contact 47,48 and fixed contact separately 206,207, and electric arc generally can be observed on traditional unit after the repulsion of contact.Thereby the erosion of main contact minimizes widely.And the risk of main contact welding reduces greatly.

In the situation that switching device according to the present invention is associated with line side current limiting device therein, magnetic is strengthened loop 210,211 and is had equally the function that keeps main contact closure in the whole process by line side restraint device Limited Current.Like this, guarantee that main contact only reduces greatly at the cause fault current due to current limiting device, or just open while even eliminating.Switching device according to the present invention has two kinds of different manifestations, and it depends on that short circuit is strong or weak to moderate strength.For strong short circuit, 30 times of rated current that namely surpass load side switch device, the rated current of about 90 times for example, line side current limiting device carry out fault current restriction so that as long as electric current surpass predetermined threshold load side switch device just performance as Closing Switch.In this case, magnetic reinforcement loop must guarantee that main contact remains on make position.For the weak situation to medium short circuit, namely be less than 30 times of rated current of load side switch device, for example the 10-30 of the rated current of load side switch device doubly, must carry out alone by load side switch device by the interruption of line side current limiting device inoperation and fault.That in this case, by magnetic, strengthens that loop produces adds brute force and needn't prevent that main contact from opening.Therefore ability that, must switching device remains closed under strong short circuit condition and find a kind of trading off between the weak ability of easily opening to switching device under the situation of medium short circuit.This is compromise, and by each magnetic reinforcement loop 210,211, the specific arrangements mode as described below about movable contact arm associated with it 203,204 obtains.

With reference to Figure 12, have been found that adding of strengthening by magnetic when strong short circuit current flows in contact arm that loop applies powerful 301 is tending towards the position of the contact arm that contact arm is covered by accentuator completely at least a portion of its length therein and wherein said contact arm and extends just over described magnetic and strengthen increase between the position 302 in loop.Surpass contact wherein a little overshoot rear one described in position, this adds powerful 301 and is tending towards reducing.Being applied to contact arm is not therefore optimum to keep this value that adds brute force 301 of contact arm closure.Weak, under the situation of medium short circuit current, as long as described contact arm opens, the brute force 303 that adds being applied by the such magnetic reinforcement loop that covers described arm when contact arm is closed at least a portion of the length of contact arm completely is just tending towards slowly reducing.Add powerful this and slowly reduce can be tending towards slowing down opening of main contact.

Have been found that, by settle magnetic to strengthen loops 210,211 so that the predetermined overshoot distance of contact arm overshoot accentuator described in when movable main contact is closed about described contact arm 203,204, the brute force that adds being applied in described contact arm is optimized to during high-intensity short circuit, keeping main contact closure and during low intensive short circuit, opening more quickly described main contact.As found out in Figure 12, due to the such arrangement of magnetic circuit, particularly for overshoot, add powerful 305 and is maximized in high strength short-circuit process, to keep main contact closed and in low-intensity short-circuit process, add brute force 307 and due to overshoot, reduce quickly to open quickly main contact.Curve 301,303 correspondences add powerful with respect to the variation there is no the open position of main contact under the situation of overshoot.

With reference to Figure 11 A and 11B, each magnetic reinforcement loop 210,211 is arranged as about contact arm associated with it 203,204 so that when movable main contact is closed (Figure 11 A), the overshoot distance 221 that described contact arm overshoot accentuator is predetermined.This overshoot distance, in the length part of contact arm of being strengthened loop covering by magnetic, on average between 0.5-1 millimeter.Label is as shown in Figure 11 A 221 the overshoot ultimate range not average apart from correspondence.In the embodiment of suggestion, maximum not average overshoot distance is greater than or is substantially equal to wearing clearance.For the rated current of 10-40 ampere, this wearing clearance between 0.5-3 millimeter, for example, equals 1 millimeter.Contact arm 203,204 and magnetic separately thereof are strengthened loop 210,211 and are operated in the following manner.When the make position of contact arm 203,204 in contact (Figure 11 A), the base portion that described contact arm is strengthened loop 210,211 about magnetic tilts a little, and the top of described contact arm is about the top overshoot a little of the branch of the U in described magnetic reinforcement loop.This overshoot that contact arm 203,204 is strengthened loop 210,211 about magnetic makes its maximization when the electric current of 30 times that strong short circuit current namely surpasses the rated current of switching device flows in described contact arm be applied to the brute force that adds in described contact arm.Exist under the situation of such electric current, the restriction of this electric current generally can be carried out by being connected to the current limiting device in line side, and be applied in contact arm 203,204 to add powerful 305 (Figure 12) substantially maximum, it remains closed the main contact 47,48,206,207 of switching device.Weak to the medium short circuit current in the situation that, the electric current of 30 times of rated current that is namely less than switching device in contact arm 203,204 under mobile situation, be applied in described contact arm add powerful 307 less.Exist under the situation of such electric current, the restriction of this electric current generally can not carried out by being connected to the current limiting device in line side, because this will bring optionally loss, and the powerful fast-descending that adds of opening by being applied in contact arm of main contact 47,48,206,207 is promoted.When main contact 47,48,206,207 starts to open, electric arc forms and electric current continues to flow in contact arm 203,204.As found out in Figure 12, the brute force 307 that adds being applied in contact arm 203,204 has overswing ratio not have overshoot to reduce more quickly (303), and main contact can be opened for it and the disappearance of this electric arc can be accelerated.

If find out in Figure 4 and 5, switching device comprises reset shut-off mechanism, it is movable when when main contact 47,48,206,207 welding.As explained below, this mechanism can also be defined as contact welding indicating mechanism.This welding of contact can be for example causes by the existence by there is the electric arc that electric fault produces when the aging and switching device end-of-life of contact pads.Reset shut-off mechanism comprises locking-bar or bar 231, and described bar is installed as on housing and rotates around pivotal pin 233.The end of the first arm 235 of locking-bar 231 is bonded in fixture 205, and contact arm 203,204 is also bonded in fixture 205.Therefore this first arm 235 of locking-bar 231 is directly coupled to main contact, and its shut-off mechanism that makes to reset can directly activate according to the position of these contacts.This first arm 235 of locking-bar 231 comprises the portion that only stops 245, when main contact is closed or weld, namely the plunger core on being firmly adhered to described fixture 157 is when controlling actuator 53 or remaining on its extended position due to the welding of main contact, and this only stops portion 245 and is pressed in only stopping on piece 247 of fixture 205.Back-moving spring 238 is arranged on the sweep 239 of locking-bar 231 and is firmly adhered to only the stopping between portion to apply reset force to unlocked position on described locking-bar of housing.This reset force also arrives the object of its retracted position as the plunger core of bias voltage control actuator 53 when controlling actuator 53 and be no longer supplied to electric power and contact and do not weld.At the opposite side about pivotal pin 233, locking-bar 231 is included in the hook 243 on the second arm 244 ends, and described hook 243 is for being bonded on the buttonhole 133 of the end of drive rod 121.Locking-bar 231 be arranged as so that the joint of this hook 243 in buttonhole 133 occur on the one hand ought be in fact due to the welding of main contact, when described locking-bar 231 is maintained at the snap close position of make position of corresponding contact arm 203,204 by the first arm 235 and fixture 205, and on the other hand when drive rod 121 is being threaded off due to electric fault or hand tripping after while moving to dropout position.When locking-bar 231 is during in snap close position, the hook 243 of described locking-bar is in fact positioned at the direction of drive rod 121 translations, so that the buttonhole 133 of drive rod is latched on described hook described in when described drive rod moves to its dropout position.Reset shut-off mechanism further comprise being placed in be arranged in drive rod 121 about the opening 249 (Figure 13 B) of the reset button 40 on the relative end of buttonhole 133).This opening for the hasp that receives padlock to prevent the reset after opening of after electric fault or after deliberately threading off by button 42 contact.Or rather, this opening 249 is placed in reset button 40 so that when the snap close 243 of the dropout position of drive rod in it and locking-bar 231 is bonded in described buttonhole (Figure 13 C), or when switching device in the close position and while there is no the welding of contact (Figure 13 A), the indentation at least in part of this opening, in this case for being fully retracted.Like this, when main contact after normally closed instruction welds by external contacts 165 or during normally closed, the reset of switching device can not be by padlock.Reset shut-off mechanism operates by mode below.When main contact 47,48,206,207 welding, opening of remote control switch 165 do not make plunger core 157 retractions and contact arm 203,204 remain on their make position.Fixture 205 is the inaccessible extension at it or closed contact position and locking-bar 231 so the snap close position in it therefore.In the dropout being caused by electric fault or after by the dropout due to pressing on hand tripping button 42, snap close 101 moves to its unlocked position and discharges contact stem 103.This identical contact stem 103 is translational motion under the pressure of spring 123 of opening contact 59, and the drive rod 121 that its installs place is due to the pressure of spring 131 translational motion that makes progress.When this motion of drive rod 121 occurs, the buttonhole 133 on the end of described bar is latched on the hook 243 of locking-bar 231 of the unlocked position in it.Therefore the upwards translational motion of drive rod 121 stopped before its mobile end.This reset button 40 that causes being firmly adhered to drive rod 121 centre position between the dropout position in tip position and the setting position of wherein said button in bottom position in wherein said button that is held in place.This centre position of reset button 40 is shown the welding of main contact.In this way, locking-bar 231 has the function of the welding of indication contact equally.

Reset is cut off or an advantage of contact welding indicating mechanism is, contact welds and detects and indicate chain upper in fact by locking-bar 231 and drive rod 121 formation.Therefore simple mechanism comprises several mechanical parts, and this has improved reliability.

With reference to Figure 13 A, 13B, 13C, the switching device of introducing above operates in the following manner.

The namely switching device when being set up in normal running is illustrated in Figure 13 A.In normal running, snap close 101 is in snap close position, and wherein hook 111 fixed contact bars 103 are in snap close position.In this position of contact stem 103, the contact pads 141 that contact 59 is controlled in the activity on described bar of being placed under the pressure of blade spring 143 by being pressed on the contact blade 181,183 of static control contact 169.And, be firmly adhered to the reset button 40 of drive rod 121 in retracted position, namely, the top section of button 40 is in the identical level of the indicating device 44 with showing red color.The movable closure of controlling contact 59 is to the control circuit power supply of controlling actuator 53, and the plunger core 157 of described actuator remains on its extended position.The fixture 205 that is firmly adhered to plunger core 157 makes contact arm 203,204 can remain on by bar 161 make position of main contact 47,48,206,207.Contact pressure spring 208 arrives and by being pressed in contact arm 203,204 to guarantee flowing of rated current for this part.

Device in dropout position is illustrated in Figure 13 B.The dropout of device can be the result of hot electric fault, magnetic electric fault or the hand tripping undertaken by hand tripping button 42.In these three kinds of situations, snap close 101 has moved to its unlocked position by trip gear 41 or hand tripping button 42, and the motion of the hook 111 by snap close 101 of contact stem 103 and release.After its release, the drive rod 121 at contact stem 103 and its installation place is because the power that spring 131 applies moves.Therefore the movable contact 59 of controlling is positioned at open position.And, the reset button 40 that is firmly adhered to drive rod 121 in complete off-position and indicating device 44 show green color, opening 249 be can approach and padlock become possibility.Movable opening of contact 59 of control no longer makes the control circuit of controlling actuator 53 to be powered, and the plunger core 157 of described actuator is pushed to its stable retracted position by back-moving spring 238.Contact arm 203,204 is owing to being firmly adhered to the fixture 205 of plunger core 157 and open position in main contact 47,48,206,207.

When main contact 47,48,206,207 welding, device is then in a state that state is identical with as shown in FIG. 13A.When the dropout of device produces by fault current or by hand tripping button 42, switching device is then in the new state as shown in Figure 13 C.In the releasing process of contact stem 103, described contact stem moves by spring 123, and this spring 123 drive rod 121 mounted thereto is because the power that spring 131 applies moves, and the movable contact 59 of controlling has moved to open position.This causes no longer supplying electric power to the actuation circuit of controlling actuator.Although actuation circuit is not supplied to electric power, contact arm 203,204 still remains on the make position of main contact 47,48,206,207 and the extended position that fixture 205 remains on it.Thereby locking-bar 231 remains fixed in snap close position, and the translational motion of drive rod 121 in moment releasing process stop by buttonhole 133, and wherein said buttonhole 133 snaps into the hook 243 of locking-bar 231.Be firmly adhered to the reset button 40 of drive rod 121 so the centre position between the depressing position when switching device is set up and the off-position when switching device is threaded off.This centre position of reset button makes it to user, show that main contact 47,48,206,207 welds and switching device can not be worked.

As found out in Figure 14, can be for the load-side feedline circuit of current limiting device 401 at previously described switching device 1.Except current limit, device 401 can also be opened input circuit under the situation of short circuit current very rapidly for occurring in one of feedline circuit.In this way, in described feedline circuit before switching device 1 is opened, input current is restricted equally.

Claims (12)

1. a switching device, comprising:

Movable main contact (47,48), it is supported by contact arm (203,204) and coordinates in make position and static main contact (206,207),

Tripping mechanism (51), it acts in described contact arm,

Manual reseting device (40), the position that it acts in described contact arm via described tripping mechanism and can occupy the position of the setting that represents described switching device and represent the dropout of described switching device,

Trip gear (41), it acts in described contact arm via described tripping mechanism, and

Be used to indicate the mechanism of the melting welding of described main contact (47,48,206,207), this mechanism acts on described manual reseting device so that described manual reseting device occupies centre position to show to exist the melting welding of described main contact,

It is characterized in that, described indicating mechanism comprises locking-bar (231), this locking-bar is provided with the movable part (235) that acts in described contact arm described locking-bar is positioned to snap close position when described main contact is closed, described locking-bar (231) is provided with lock catch arm (244), this lock catch arm is with hook (243), described hook is arranged as so that described manual reseting device (40) is fixed on to described centre position after described switching device is threaded off when described locking-bar is in described snap close position, and, the movable part of described locking-bar (244) is the second arm, and this second arm of described locking-bar (231) comprises when described main contact is closed by the portion that only stops (245) on piece (247) that only stops that is pressed in contact holder, and the drive rod (121) of the mechanism of melting welding that is used to indicate described main contact by tripping mechanism (51) acts on described manual reseting device, and described manual reseting device (40) is fixedly mounted on one end of described drive rod (121), described drive rod (121) the other end comprise for after threading off by the buttonhole (133) of described hook (243) locking of described locking-bar (231), and described tripping mechanism (51) acts on described movable main contact (47 via the control actuator (53) with electromagnet, 48) on, described movable main contact is by movable part (157) coupling of contact holder and described control actuator, described tripping mechanism (51) is via the switch (59 of described switching device inside, 169) coordinate with described control actuator (53), described switching device comprises the movable contact (59) of controlling, described control contact (59) opens indirectly to open described movable main contact (47 when occurring to thread off, 48), the reset of described switching device is carried out by manual reseting device, described manual reseting device is reset button (40) and closed described control contact (59), so that can control with the described movable main contact (47 of closure, 48).

2. device as claimed in claim 1, is characterized in that, the described movable part (235) of described locking-bar (231) is by described contact holder and described contact arm (203,204) coupling.

3. device as claimed in claim 1 or 2, is characterized in that, described contact holder is formed by fixture (205) in fact, and described second arm (235) of wherein said locking-bar (231) and described contact arm (203,204) engage.

4. device as claimed in claim 1, it is characterized in that, described manual reseting device (40) comprises for coordinating the hanging locking device with switching device described in locking with padlock annex, and this hanging locking device can not approach during in described centre position when described manual reseting device.

5. switching device as claimed in claim 1, comprising:

The movable contact arm (203-204) of being made by electric conducting material, its movable support main contact (47,48) to be to open or closed described movable main contact,

Contact pressure spring (208), it acts in described contact arm to apply contact pressure between described movable main contact and static main contact (206,207), and

The opening magnetic with U-shaped profile is strengthened loop (210,211), it is associated with described contact arm, described magnetic is strengthened loop (210,211) by ferromagnetic material, formed, and be arranged as so that cover this contact arm at least a portion of the length of described contact arm when described movable main contact is closed, so that strengthen described contact pressure when short-circuit current is mobile in described contact arm

It is characterized in that, described magnetic is strengthened loop about described static main contact (206,207) be securely fixed in described switching device, and it is arranged as about described contact arm so that contact arm is strengthened the predetermined overshoot distance (221) of loop overshoot from described magnetic described in when described movable main contact is closed.

6. device as claimed in claim 5, is characterized in that, at the above overshoot distance (221) average out to 0.1-2 millimeter of at least a portion of being strengthened the described length of the contact arm that loop covers by described magnetic.

7. device as claimed in claim 6, is characterized in that, at the above overshoot distance (221) average out to 0.5-1 millimeter of described length part of being strengthened the contact arm of loop covering by described magnetic.

8. the device as described in any one in claim 5-7, is characterized in that, described magnetic is strengthened loop and had the yardstick between 20-35 millimeter that is included in limiting in the direction that is parallel to described contact arm length.

9. the device as described in any one in claim 5-7, is characterized in that, described magnetic reinforcement loop has the yardstick between 4-7 millimeter that is included in the direction restriction of the length perpendicular to described contact arm.

10. the device as described in any one in claim 5-7, it is characterized in that, described contact arm (203,204) by blade, formed, this blade is arranged as so that its two largest face are roughly strengthened the Liang Ge branch of the U-shaped that the profile in loop forms in the face of the described magnetic by being associated with described contact arm.

11. devices as described in any one in claim 5-7, is characterized in that, described overshoot distance is greater than or equal to the wearing clearance that described main contact (47,48,206,207) is formed on contact pads wherein.

12. devices as described in any one in claim 5-7, it is characterized in that, described magnetic is strengthened loop (210,211) and directly in the described contact arm being associated with it, is interacted when short-circuit current flows in described contact arm, to strengthen contact pressure.