DE1221711B - Locked switchgear depending on electrical fuses - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

DESIGN SCREEN

Int. α .:

HOIh

German KL: 21c-41/01

Number: 1221711

File number: W 22025 VIII d / 21 c

Filing date: October 11, 1957

Opening day: July 28, 1966

The invention relates to a switching device that is locked as a function of electrical fuses, consisting of a circuit breaker and a fuse link, which is in series with the circuit breaker switched fuses when the rated breaking capacity of the switch is exceeded Overcurrents respond, with circuit breaker and fuse link on a common base are arranged.

In switching devices of the type mentioned above, the switch-off characteristics of the circuit breaker and the fuses so coordinated that the circuit breaker in conventional Way responds to overcurrents below its breaking capacity, while the fuses then take action when overcurrents occur that exceed the switching capacity of the circuit breaker.

The invention is based on the object of providing a multi-pole switching device of the type mentioned above to create a current-limiting fuse in a plug-in socket for each phase of the circuit breaker contains, which is electrically connected in series with each pole of the switching device, the assignment a fusible link to the circuit breaker should be made so that both when you press the Circuit breaker as well as when responding, inserting and / or replacing the fuses Optimum safety for the operator is guaranteed. According to the invention, the task is set solved in that means are provided with a multi-pole arrangement of the switching device that the The circuit breaker can only be switched on again when the fusible links are in the operating position allow for all poles, and that this means of plug-in sockets of the receiving device for which fuse links are independent. It is particularly advantageous if sensing elements are provided which act on the tripping mechanism of the circuit breaker in the absence of one of the fusible links.

According to a further development of the invention, means are provided that allow the mounting of the receiving device for the fusible links on the switch only allow when the receiving device contains operational fuse links for all poles that are in the operating position. Appropriately the tripping device of the circuit breaker is controlled so that it is triggered by one of the cover of the Fusible link controlled by the mechanical actuator of each fusible link and through every organ of feeling for the presence

Dependent on electrical fuses
locked switchgear

Applicant:

Westinghouse Electric Corporation,

East Pittsburgh, Pa. (V. St. A.)

Representative:

Dr. jur. G. Hoepffner, lawyer,

Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:

Charles L. Jones,

Robert H. Flick,

Hiller D. Dorfman,

Howard E. Reichert, Beaver, Pa. (V. St. A.)

Claimed priority:

V. St. v. America October 18, 1956

(616761),

dated December 24, 1956

(630305)

a fuse link can be triggered and kept triggered.

The switching device has an insulating housing, which consists of a base plate and a cover for the There is a circuit breaker inclusion. The fuses are in a special cover or holder arranged, which has the elements that open the circuit breaker when the fuse cover or holder is removed.

Structure and mode of operation of the invention with additional Details and advantages should be based on the following description in connection with are explained in the accompanying drawings. In the drawings shows

Fig. 1 is a plan view of the switching device that the Contains principles of the invention, with the cover partially removed;

F i g. Figure 2 shows a vertical section substantially along the line Π-ΙΙ of FIG. 1 in the direction indicated by the arrows;

Fig. 3 shows an enlarged section of part of the switching device, which the Auslösevorrich-

609 607/294

the circuit breaker and the fuse connection.

Another design of the switching device show the Fi g. 4 to 9. Fi g. 4 shows a plan view of FIG partially cut-open switching device that contains ι the principles of the invention;

F i g. Fig. 5 is a partial vertical section showing essentially is passed through the middle pole of the switching device; ^ - -,

F i g. Figure 6 is a partial view showing the means shows, which bring the tripping bimetal element in the tripping position when the fuse holder on his Space is moved while one of the fuses is removed;

Fig. 7 is a detailed sectional view along the Ljnie IV-IV of Fig. 1 and shows the means for attaching the attachment for carrying the fuses to the base plate of the Switching device;

Fig. 8 is a detailed view which shows the means by which the circuit breaker trips when the fuse holder or cover is removed and the ^ prevent the insertion of the fuse holder ^ if 'not all fuses are on are in their place, with the items drawn in their normal position when the fuses all are in the position holder;

Fig. 9 shows a view similar to that in Fig. 5 represents, but shows the individual parts in the positions they occupy when the. Attempt made to insert the fuse holder if one of the fuses is missing.

With reference to FIGS. 1 and 2: The switching device consists of a base plate. 11 'made of insulating Preßstöff, on .der. ·, The various elements of the Switch mechanism, and the current-limiting fuses are installed. A lid 13 made of isoplatte 11 an enclosing housing for the switch. "" '.- "; - Γι; -ί.". · * »'. '! .

The switchgear is of the multi-pole type each pole has lead terminals 15 and load terminals 17 at opposite ends of the Base plate 11 are arranged, and a connection 19 (Fig. 2 and 3),. Between the ends of the Base plate lies. The switch comprises a resting contact 21, a movable contact 23 and an arcing chamber, 25 for each pole of the switch. An ordinary switching mechanism, general-at 27 indicated is for the simultaneous movement of the three movable contacts are provided in open and closed positions, and one is locked The triggering device, indicated generally at 29, is used to “automatically open the switching contacts depending on predetermined overload conditions in the · "circuit through any pole of the switch.

The lead connection 15 forms the outer end of a .Lleiterstreifens. 31, - which is located in the housing extends and rigidly carries the resting contact 21. The movable contact 23, for each pole is mounted on a contact arm 33, which is supported by a Switching arm 35 is carried, which is held by a switch shaft 37, which extends over all Poles of the switch..and the switching arms of the various Pole-des Sot / age stretches connecting to simultaneous movement in open and closed positions. The contact arm 33 is connected to a terminal 41 (Fig. 3) by a flexible conductor 39, which is attached to the base plate 11 with a screw 42 (Fig. 3), the same time is used to attach one end or leg of a heating element 43 to the base plate. A bimetal element 45, which forms part of the triggering device 29, jst on the other leg of the heating element 43 attached, which is electrically connected to the

ίο intermediate connection 19 is firmly connected.

The switch mechanism 27 (Fig. 1) of the switch is housed in the central portion of the housing and is supported by a pair of frame members 53 (only one shown) mounted on the base plate 11. The switching mechanism comprises a forked pivot lever 55, a transmission which contains members 57 to 59, toggle springs 61 and a releasable rotary arm 63 which is controlled by the device 29 Auslösevorricln. An arcuate insulation shield 67, which has an opening 69 in the. Cover 13 closes, is mounted on the end of the pivot lever 55 and has a handle 71 fixedly connected to it, which protrudes through the opening 69 to allow the actuation of the switching mechanism by hand.

The gear members are held together rotatably by a bolt 73. The transmission member 57 is rotatable by a bolt 75 to the rotary arm _63: connected, and the transmission member -59 is connected to the switch arm 35 for the center pole by a pin 77th The toggle springs 61 are attached under tension between the knee pin of the gear 55 to 57 and the outer end of the pivot lever 59.

The switch is opened by turning the handle 71 (F i.g. 1) clockwise in the "Off *" division is brought, the toggle springs 61 snapping over the gear 57 bis, 59 and a. Effect opening movement of the switch arms 35 for all poles of the switch in a well known manner.

The switch is closed by hand by pulling the handle 71 in the opposite direction from the "off" - yes, the "on" position is brought, causing the springs 61 to overlap and thereby brings the transmission to stretch, with the shift arms 35 brought all poles into the closed position will.'

In addition to the bimetal element 45 of each pole, the trip device also contains a series overload trip magnet 79 (F i g. 3) for each pole and a release lever 81 common for all poles, the by a spring 82 (Fig. 3) in the latched position is held. The release lever 81 is made of an insulating material and is rotatable by means of bolts 83 (only one shown) attached to a support arm 85, which is on the base plate 11 with the Screws 42 is attached. The support arm 85 also carries an insulating support 87 for the release device. A tight cap 89 made of isolate.

the material is provided to enclose the release device. A pawl 91 (Fig. 3) the release lever 81 normally engages a locking device 93 which is reversed in FIG

_mm the arm 63 engages the switching mechanism

65, to be releasably held in the closed position.

The release magnet 79 (Fig. 3) contains a U-shaped magnet yoke 95, which is supported by a bracket & 97 is worn on the edition 87 for the

5 6

Release device is rigidly attached. A moving value less than its breaking capacity to lower armature 99 is in an extension 101 which breaks when a fault current of a greater height is mounted on console 91 and has attached to it a round rod 103, which is at its outer end as the breaking capacity of the switch the current-limiting fuses come into operation, head 105 for coupling and actuation of the off-speed, in order to limit the current and to break the release lever 81 in the event of the magnet being energized.

wearing. A coil spring 107 over the rod 103 Switching devices have become known in which the rod and the armature 99 in the not tightened hold the current-limiting fuses in the open position. The release magnet 79 is excited by sharing outside the switch cover and on Zuden connecting conductor 19, which are arranged between the io line end of the switch. It extends the legs of the U-shaped magnet yoke. if there is the option to close the switch,

If there is a slight overload, it will be replaced before a burnt fuse. This

Bimetal element 45 through the heating element 43 is a fact together with easy accessibility

heats and flexes after a predetermined heating of the fuses can be dangerous for the person

to the right (Fig. 3) to represent an adjustable setting 15 that attempts to set one or more safety devices

screw 109 on the release lever 81 to move gene to replace.

and the latter for releasing the pivot arm 63 and according to the present invention is one

the switch contacts open after a fuse 113 for the up-current limiting fuse for each of the three

heating of the bimetal required time delay to the poles of the breaker available, and all safety starts. - 20 stanchions are in or on a special see-.

The switch is currently mounted by the action housing or fuse holder, the

of the release magnet 79 is open. Once the magnet is attached to the load end of the switch housing so;

due to overload currents of e.g. 1000% or more that it is removed together with the fuses

of the normally flowing current or through one. can without removing the switch cover;

Short-circuit current is excited, the armature 99 will be needed.

pulled ^ which causes the head 105 to switch off. A terminal 115 of the fuse 113 is with the

release lever 81 sets in motion and thereby instantaneous intermediate connection 19 of the switch by means of a

borrowed solution of the rotary arm 63 brings about. This plug contact 116 is connected by a _:

causes the contacts of all three screws 117 to open automatically at connection 19 of the release /

Switch PoIe. 30 unit is attached. The other terminal 121 of the ■

It is necessary to reconnect the mechanism. Fuse 113 is similar to the load terminal 17 ,

tension and to verklinkeny before the switching contacts are connected by a plug contact 119 . The access

after an automatic opening action, closed line connections 115 and load connections 17 are connected

can be sen. Tension and latch are the opposite ends of the base plate.

are caused by the fact that the handle in clock 35 is provided with terminals 123 to switch the.

is moved as far as possible. Switch the dialing device into an electrical circuit. "

This movement puts an approach 111 on the can. Such terminals are not for the

Swivel lever 45 provided a shoulder on the rotary arm 63 intermediate connections 19, - as the entire

and moves the latter clockwise. Electricity through both the Sehalter and the

Shortly before the end of the movement of the rotary arm 40 fuses flows.

63 clockwise becomes the locking end. The fuses 113 for all poles are in one

the same with the locking mechanism 93 in a special cover member or holder 131 made of iso- ■

coupled again in a well-known manner. The switch is made of loose material, which is removable on the ·

contacts are then loaded in the previously described base plate 11 with the aid of screws 133

Way by moving the handle in the »Ein« - 45 is fixed, which with the upper ends of the bolt ■■

Closed position. ·. 129 screwed together in the base plate 11 ■

The arcing chamber 25 can be of any type, so that together with the fuses it may be of the type that appears expedient, which can be obtained without removing the switch cover 13 from a number of slotted metal sheets of ma. The fuses 113 are fixed and quickly extinguished by magnetic material into which the arc is driven 50 a transverse rod 135 in the cover member 131. held that at the bottom of the cover member with

The switch described may, for. B. a permanent screw 137 is attached, which lead into metal inserts current of 225 A and a breaking capacity 139 are screwed, which in partition walls 141 . of 25,000 A at 600 V AC voltage, in which the cover member is formed, which is between and he will see fault currents up to his switch-off 55 the fuses 113 extend, reliably interrupt power. Buildings, like factories, when an overcurrent is close to or above the off. Hospitals, residential houses, etc., have branch and switching capacity of the switch, are one or supply circuits for lighting and power purposes. several of the fuses 113 respond and the such circuits are sometimes at power interruption. The tripping magnet 79 is connected to sources that are capable of fault currents 60, even in most cases, to move in the order of 100,000 or more am- the trip lever 81 and to deliver the switch pere, what the breaking capacity of the to open although the fuse far exceeds the current under circuit breaker. The onset of break, before the switch contacts open, current limiting fuses which have a higher Means are provided to the trigger lever ■ [breaking performance than having the switch hold at 65 81 in the release position, after a series circuit with the electric circuits through the The fuse has responded to the latching of the different poles of the switch, allowing the switch switch mechanism and closing the switch to work normally to prevent fault currents going up to contacts until the fuse blows

is replaced. These means include a preloaded plunger or exciter 143 (Fig. 3) on each of the Fuse that is live to move to the left when the fuse blows. Of the The plunger of each fuse moves one of the three pivoted release levers 145. Each lever 145, which depends on the response of a fuse is, is provided with eyes 147 which hold the link rotatably on a bolt 149 which is in slots the partition walls 141 is mounted on the fuse cover or holder and in place is held by insulating inserts 151. One end of each lever or trigger element 151 is bent upwards as at 153 and the other end 155 of the trigger element 145 is the free Adjacent end 157 of one of the three arms 159, each through an opening in the release cover 89 protrude and are attached to the release lever 81.

If the fuse 113 trips one of the poles of the switching device, the plunger 143 of the in Activity kicked fuse relaxed and driven to the left. The plunger 143 engages the end 153 of a release element 145 and moves the latter counterclockwise and thus causes that the end 155 of the lever engages the free end 157 of the arm 159 and the release lever 81 moved to the release position. The release lever 81 is held in the release position until the burned Fuse is removed. As long as the release lever 81 is held in the release position, can the switch mechanism cannot be cocked and the switch cannot be closed.

The fuse holder or cover 131 is removed from the switch together with the fuses 113, by first removing the screws 133 and then the fuse cover 131 is moved upwards to the fuse terminals 115 and 121 with their corresponding plug contacts 116 and 119 to disengage. Since the fuses and the fuse housing are removed the three trip levers 145 mounted in the fuse housing become at the same time so removed. This relieves the load on the arm 159 and allows the spring 82 to move the release lever 81 into the latching position bring to. If the release lever 81 were in its normal latching position, it could the switch mechanism are latched again and the switch contacts are closed. While the circuit between the plug contacts 116 and 119 must be open at this moment a dangerous situation could arise if an attempt were made to remove the fuses to be used, while an exceptionally high fault current can occur. Funds are provided to to prevent the release lever from returning to the latching position when the fuse housing removed, and hold the release lever in the unlocked position until the fuse housing engages its position on the switching device is brought and the fuses with their plug contacts back in Intervention.

These means consist of a spring-loaded plunger 161, which is inserted into an opening of the Release device cover 89 and an opening in the support 87 of the release device is. The plunger 161 is tensioned to the right against the fuse housing by a spring 163 held between the support 87 of the triggering device and lugs 165 on the plunger 161 is appropriate. When the fuse housing 131 is moved up, the fuses are out of order To bring engagement, a slide 167 on the fuse housing of the spring 163 allows the plunger 161 to the right, causing the tabs 165 to abut a stop 169 on the Release lever 81 are ajar and the release lever is brought into the release position. the Spring 163 can hold the release lever in the release position until the fuse housing is at its Place is placed on the interrupter, at which point the slide 167 pushes the plunger 161 hits and turns him left into the in Fi g. 3 brings position drawn. This allows the spring 82, the trip lever bring it back into the latching position so that the switch is tensioned and closed again can be.

The plunger 161 also makes it impossible to close an arc between the fuse connections 115, 121 and the plug contacts 116, 119 pull what could happen if you pulled out the fuses while pulling the switch contacts are closed 'and the current flows. The position and inclination of the slide 167 is such that the Plunger 161 is moved when the fuse holder 131 moves outward before the fuse connections disengage from the plug contacts come, with the result that the switch contacts are opened first and the arc is extinguished in the quenching chamber 25 before an arc between the fuse connections and Plug contacts can be pulled. The plunger 161 also prevents the circuit from being closed if the three fuses are individually be inserted without being previously mounted on the holder 131, the housing or cover serves to prevent bare parts from being touched when they are live.

If the fuse box is in place is brought to the switching device while a burnt fuse is still in the holder, the plunger 143 of the burnt fuse will hold its release lever 145 in the working position and, as soon as the holder is brought into place, the end 155 of the lever 145 becomes with it the end 157 of the arm 159 engage and hold the release lever 81 in the release position. This ensures that any burnt fuses are replaced before the fuses and the holder be brought to their place on the switchgear.

Sense organs are also provided which sense the presence or absence of each of the fuses and hold the release lever in the release position if one of the fuses is left out when the Fuse holder or the fuse housing is brought into position on the interrupter. This The sensing element consists of a sensing finger 166 for each of the fuses 113, which is rotatable on the bolt 149 is stored and held tensioned in the counterclockwise direction against the fuse by a spring 168 will. After the fuse housing 131 and the fuses 113 are removed from the circuit breaker the fuse or fuses are removed from the fuse housing, by the screws 137 and the support rod 135

9 10

removed. The fuses can then either be a flexible conductor 339 with a terminal 341

be removed by connecting them to the bottom of the Ge, which is on the base plate 311 with a

house, as shown in FIG. 3 shown to be moved. The screw 342 (Fig. 6) is fastened at the same time

Removal of one of the fuses from the housing to secure one end of a conductor strip

releases the feeler finger 166 and the spring 168 rotates 5,343 to the base plate 311. A movable one

the finger immediately counterclockwise. Wah conductor 344 connects the other end of the conductor strip

During this movement, a yoke part 170 of the window 343 comes to the fixed end of the bimetallic element

Feeler finger with the release lever 145 in one 345, the other end fixed to one

grabbed and rotated the latter also counterclockwise- the end of the conductor strip 347 is attached, while-

direction. The fuse goes into the fuse io rend the other end of it to port 319

housing inserted by first hand of the covers.

Finger 166 moved clockwise enough The switching mechanism 327 (Fig. 5) of the scarf is to allow the fuse to be housed in the central part of the housing Space is brought into the housing. The fuse is made by a pair of expanded frames then inserted and the holding rod 135 on its 15 members 353 (only one shown), which is on the basic square brought and there by the screws 137 plate 311 are fixed, held. The gearshift mechanism is attached. If all the fuses are in the genism includes a forked pivot lever 355, position, fingers 166 are tilting PoI for this one gearbox that includes links 357 and 359 or this backup by the spring 168 in springs 361 and a releasable pivot arm 363, the its extreme position in counterclockwise direction 20 rotatably mounted on a pin 365 and through are moved and its release lever 145 is controlled in the release device 329. A Move counterclockwise. If the see arc-shaped insulation shield 367, which is in the core housing in its place on the switching device, an opening 369 in the cover 313 closes, is brought while one or more of the is mounted on the end of the pivot lever 355 Fuses are omitted from the housing, 25 and has a handle firmly connected to it the end 155 of the release lever 145 of the 371, which protrudes through the opening 369, to the Remove the omitted fuse with the end 157 of the actuation of the switching mechanism by hand 159 come into engagement and release the release lever.

81 hold in the release position, although the sliding The gear members 357 and 359 are moved by a path 167 the plunger 161 so that the bolt 373 held together rotatably. The release lever is released. drive member 357 is rotatably connected with a bolt 375. Another embodiment of the invention shows the pivot arm 363, and the gear member is shown in FIG. 4 through 9. 359 is associated with the switch arm 335 for the middle pole. With reference to FIG. 5: The switching device is connected by a pin 377. The toggle springs from a base plate 311 made of insulating compression 35 361 are under tension between the knee pin fabric on which the various parts of the gearbox 357 to 359 and the outer end termechanimus and the current-limiting see-the pivot lever 359 attached,
rungeh are mounted. A cover 313 made of isolate The switch is opened by the handle of the molding material, which can be secured 371 (FIG. 1) on the base plate 311 in or secured in an anti-clockwise direction, with the base plate 40 "off" position is brought, the toggle springs 311 an enclosing housing for the switch. The switching device is of the multi-pole type, and an opening movement of the switching arms 335 for each pole has lead connections 315 and loads to all poles of the switch in a well-known manner, 317 acting at opposite ends of the switch.

Base plate 311 are arranged, and a terminal 45. The switch is closed by hand 319 (Figs. 5 and 6), between the ends of the handle 371 in the opposite direction of Base plate lies. The switch includes a dormant »off« - which is brought to the »on« position, the contact 321, a movable contact 323 and what the springs 361 to overturn and thereby and an extinguishing chamber 325 for each pole of the shifting device for stretching the transmission, the shifting device. A common switching mechanism 327 is for 50 arms 335 of all poles in the closed position the simultaneous movement of the three movable ones can be brought about.

Contacts in the open and closed position before- As previously shown, the release includes, and a release device, generally in direction 329, a bimetal element 345, which is indicated in the 329, is used to automatically open the circuit of each pole of the switch in series connected switch contacts depending on is pre-55. The trip device also includes proper overload conditions in the circuit by means of a pivoted trip lever 379 for pressing any pole of the switch. substance that extends over all poles of the switch. The lead terminal 315 forms the outer pawl member 381 which extends on the release lever 379 end of a conductor strip 331 which is mounted in the Ge, usually with the pawl housing and rigidly engages the resting contact 321 60 end of the releasable pivot arm 363 and keeps wearing. The movable contact 323 for each pole returns the rotary arm to the working position,
is carried by a contact arm 333, each pole of the switch is latched to one being carried by a switch shaft 335 which is provided with handle 383, which is rotatably supported by a connecting rod 337, the U-shaped frame 385 on the base plate 311 itself extends over all poles of the switch and the 65 of the switch is mounted. A coil spring 389 to switch arms to the various poles of the switch is provided to bias the lever 383 in clockwise simultaneous movement in the open and closed directions. The rotation of the lever position connects. The contact arm 333 is through 383 in a clockwise direction is normally through

the engagement of a latch extension with a pawl 391 on the free end of the bimetal 345 prevented.

If the bimetal 345 for a pole of the switch up to a certain height as a result of a Overload current is pickled, it bends in such a direction that it the associated handle 383 unlatches, whereupon the spring 389 snaps the handle in a clockwise direction and thereby the Caused the end of the lever to strike a lug 393 on the release lever 379 and the Bring the release lever into the release position. This causes the pawl 381 to release the pivot arm 363 and cause the switch to open.

The release device also contains an overload release magnet connected in series, which triggers the switch instantly as a result of strong overload currents, e.g. B. 1000% or more normal load current or in the event of a short circuit in the circuit of any pole of the switch.

For this purpose, each pole of the switch is provided with an electromagnet, which is generally used in 395 is indicated, and a U-shaped magnet yoke. 397, through the opening of which the Ladder 343 extends, and a rotatable armature 399 having a projecting arm 401, the hit a shoulder 403 on the release lever 379 and bring the release lever into the release position can.

When the release lever 379 either by releasing the lever 383 or activating the release magnet 395 is moved in the unlatched direction, the pawl 381 releases the rotary arm 363 and allows the springs 361 to rotate the rotary arm on its pin 365 in a clockwise direction. This contributes the pivot 375 on the right side of the line of force of the springs 361 and causes the snap of the tilt gear 357, 359 and thus an opening movement of the switch can 335 for all poles.

It is necessary to re-tension and re-latch the mechanism before the contacts follow an automatic opening action can be closed. Tension and latching will be thereby causes the working lever 355 by the handle 371 in the counterclockwise direction so far is moved as possible. During this movement, a lug 405 places one on the pivot lever 345 Shoulder to pivot arm 363 and moves the latter counterclockwise.

When the pivot arm 363 is rotated, its latching end passes the pawl 381 and comes with it a lug 405 on the release lever 379 engages, causing the latter to slow in a clockwise direction is brought beyond its normal position. As a result of the movement of the release lever 379 the extension 393 moves the lever 383 in a counterclockwise direction, whereby the spring 389 is compressed and the lever 383 is re-engaged with the pawl 391. The pawl 381 has now taken up their normal latching position in the path of the rotary man 363, the contacts are closed in the manner described above.

The arcing chamber 324 may be of any convenient type that is shown from a number of slotted sheets of magnetic material into which the arc is driven and is deleted quickly.

In accordance with the present invention, there is a current limiting fuse 413 for each of the three Poles of the switching device are present and all fuses are in or on a special fuse housing or mounted fuse holder, which is attached to the load end of the switch housing so that it can be removed together with the fuses, without the switch cover needing to be removed.

ίο A terminal 415 of the fuse 413 is connected to the Intermediate connection 319 of the switch is connected by means of a plug contact 416 which is connected to the connection 319 of the trip unit is attached. The other terminal 421 of fuse 413 is similar to that Load connection 317 connected by a plug contact 419. The lead connections 415 and the load connections 317 at the opposite ends of the base plate are provided with terminals 423, in order to be able to switch on the switching device in an electrical circuit.

The load connections 317 are mounted on a projection 409 (Fig. 2 and 4) made of molded insulating material, which is rigid is attached to the load end of the molded base plate 311 of the switching device. Approach 409 is on the base plate 311 held by spaced bolts 410, the stepped and threaded provided ends 411 which fit into threaded holes of the metal inserts 412 in the base plate 311 of the switch are screwed in. The bolts 410 have openings to support mounting pins 417 for mounting of the switching device on a support means. After the approach is mounted (as in F i g. 4), screws 417 mounted in a countersunk hole 418 are threaded holes in the Ends of the bolts 410 are screwed and leaned against the shoulder of the plunger to do this to hold the approach rigidly at the end of the base plate 311.

The fuses 413 for all poles are in a special housing or holder 431 made of insulating Mounted material that is removably attached to the base plate 311 by means of screws 433 that are screwed together with metal inserts 429 in the base plate 311, and through Screws 432 screwed together with metal inserts 434 (Figs. 2 and 4) in extension 409 are. In this way, the fuse holder 431 can be removed together with the fuses, without removing the switch cover 313. The fuses 413 are secured by a cross bar 435 held rigidly in the fuse holder 431, which is attached to the bottom of the cover member with screws 437 (only one drawn) is attached, which are screwed into metal inserts 439, which in partition walls 441 are molded in the fuse housing, which in turn extend between the fuses 413.

If an overcurrent occurs close to or above the breaking capacity of the circuit breaker, one or more fuses 413 respond and interrupt the current. The trigger magnet 395 will also come into action in most cases to move the release lever 379 and the To open the switch, although the fuse will interrupt the current before the switch contacts open. The trip lever 379 is kept biased to its normal position by springs (not shown) Position after addressing one of the

Trip solenoid return so that the mechanism is locked and the switch is closed again if one of the fuses is blown. This would result in single-phase operation.

Means are provided to hold the release lever 379 in the release position after a fuse has tripped to latch the switch mechanism and close the Prevent switch contacts until the burnt fuse is replaced. These funds include one preloaded plunger or exciter 443 (Fig. 2) on each of the fuses, which is spring-loaded, to move to the right when the fuse blows. The plunger of each fuse moves one of the three rotatably mounted trip lever 445 (FIGS. 5 and 6), which are used for each pole of the switch available. Each handle or link 445 is rotatably mounted on a pin 447, the carried by an arm 449 which, in turn, by means of a screw 451 on the upper part of the U-shaped frame that carries the release lever 383. The handle 445 has one upwardly bent arm 453, which is in such a position that it is abutted by the plunger 443 is used to move the handle 445 clockwise when the fuse blows. The handle 445 also has a downwardly curved arm 455 supported by a light spring 457 is held tensioned against a conductor strip 459 which is rigidly attached to the free end of the bimetallic element 345 and to which the flexible conductor 344 is attached.

When a fuse 413 trips, the plunger 443 strikes the arm 453 and rotates the handle 445 rapidly clockwise, causing arm 455 of lever 445 to to bend the bimetal 345 in the release direction. This triggers the release lever 383, which immediately goes through its spring 389 is snapped in a clockwise direction, whereby the end of the lever 383 causes is to touch the approach 393 and hold the release lever 379 in the release position. The release lever 379 is held in the release position until the burnt fuse is removed. As long as the Release lever 379 is held in the release position, the switch mechanism cannot be cocked and the switch cannot be closed.

The fuse cover or holder 431 is taken from the switching device together with the fuses 413 removed by first removing the screws 432 and 433 and then moving the fuse holder 431 upwards around the fuse terminals 415 and 421 with their corresponding plug contacts 416 and 419 out of engagement bring. If the fuses and fuse holder are removed, the plunger 443 will be the burned one Securing or safeguards from its inhibitory contact with the arm 453 by the Handle 445 removed, and the resilience of the bimetal 345 causes the free end of the bimetal to to take its latching position.

If the bimetal element 345 were in its latching position, the mechanism could latch again and the switch contacts are closed. While the circuit in this situation would be open between the plug contacts 416 and 419, a dangerous situation could arise, if the attempt were made to insert the fuses while an exceedingly high one Fault current can occur. Means are provided to enable the release lever to return to the To prevent latching position when the fuse housing is removed and the release lever in in the unlocked position until the fuse housing reaches its position on the switchgear is brought and the fuses have been re-engaged with their plug contacts.

ίο The means to keep the release lever in unlatched Hold position when the fuse holder is removed from the switchgear consist of one rotatably mounted handle 461, which is mounted on a pin 462 on the arm 449, the Carrying handle 445 and is kept tensioned in a clockwise direction by a spring 463. One arm 465 of the lever 461 is held taut against the fuse holder 431 by the spring 463, and the The other arm 467 of the handle is normally arranged to connect to the pawl 381 on the trip lever is ajar. The removal of the fuse holder 431 allows the spring 463, the handle 431 clockwise, causing arm 467 to engage pawl 381 comes and holds the release lever 379 in the unlocked position. If the fuse housing is attached to his Space is placed on the breaker, the edge of the holder lies against the upwardly curved one End of the ann 465 and moves the lever 461 counterclockwise to the position shown in FIG. 2 is shown, whereby the release lever is released so that it is brought into its latching position can be.

The spring 463 moves the lever 461 into such a position that the release lever is in the release position is held before the fuse connections 415 and 421 are separated from the corresponding plug contacts making it impossible for an arc to occur between the fuse terminals and to pull their plug contacts, which could happen if the fuses were pulled out while the switch contacts are closed and the current is flowing. If that Fuse housing is removed without a fuse has responded, and the switch is closed the spring 463 is of sufficient strength to cause the arm 467 of the lever 461 to Touching the release lever and bringing it into the release position, which opens the switch. Of the Handle 461 also prevents the circuit from being closed when the fuses are cut would be inserted without first on the holder 431, which serves as a housing or cover, to prevent that bare parts are touched when they are under tension to be assembled.

If the fuse housing is brought into position on the switchgear while another If the burnt fuse is in the holder, the plunger 443 will be with the burnt fuse the arm 453 of the lever 445 engage and through the arm 455 of the lever the Hold the free end of the bimetal 345 in the release position. This allows the spring 389, the trigger handle 383 to hold in such a position that it holds the release lever in the unlocked position. this Ensure that any burnt fuses are replaced before the fuses and the holder are connected their place on the switchgear.

As previously shown, the fuse holder moves when it is in place on the switchgear is brought, the lever 461 so that the release lever is brought into its latching position can be. The switch mechanism can then be cocked and the switch closed. this could give rise to a dangerous situation if the fuse holder is put in place and one of the fuses would have been omitted. Means are provided for the switch to open when the fuse holder is put in place without all of the fuses in place Space on the fuse holder.

These resources consist of an elbow 469 (Figs. 5 and 6) for each fuse that is on a Pin 471 is mounted, which is mounted in the fuse holder 431 and through a plate 473 on is held in place, which is attached to the holder with a screw 475, as shown in FIG. 5 shown attached is. When the fuse 413 is in place on the holder, an arm 477 of the elbow 469 becomes held against the pressure of a spring 479 on the fuse, whereby the other arm 481 to the left of the bent end of the arm 453 of the lever 445 is kept free. When the fuse 413 is removed, the spring 479 moves the elbow 469 counterclockwise to the position the in F i g. 6 is shown. An attempt would be made to put the fuse holder in place To bring on the breaker while one of the fuses is missing, the arm 481 of the elbow lies down 469 to the curved upper end of the arm 453 and moves the lever 445 in a clockwise direction, thereby causing the arm 455 of the lever to unlatch the free end of the bimetal Direction bends. This releases the release lever 383, the spring 389 of which immediately releases the lever 383 moved in the release direction, whereby its end rests on the release lever 379 and this in the release position brings and holds in release position until all fuses are in place on the fuse holder are.

The F i g. 8 and 9 illustrate a device that allows the release lever 379 to be returned to its Latched position prevented when the fuse holder 431 is brought into place on the switching device and one or more of the fuses have been omitted. This device consists of a knee lever 483 which is rotatably mounted on a pin 485 which is in the fuse holder and held in place by a plate 487 attached to the fuse holder is attached with a screw 489. The lever 483 is counterclockwise by a spring 491 held taut, but is normally held in the position shown in FIG. 8 is shown in that the fuse 413 rests on an arm 493 of the knee joint 483. The other arm 495 of the The knee flexor extends downward and to the right, as in FIG. 8 shown. When the end of 497 of the arm does not touch the switch cover 313, the knee lever 483 is in the position shown in FIG. 8th shown is retained as long as fuse 413 is in place in the fuse holder 431 is. As shown earlier, it is necessary to have the fuse holder 441 together with the fuses to be removed if a burnt fuse is to be replaced. When the fuse is out of the holder is removed, the spring 491 moves the knee lever 483 counterclockwise until the End 497 of arm 495 touches the same edge of holder 431 that normally touches handle 461 touches and holds it in the position shown in FIG. If an attempt is made, the Bring fuse holder 431 into place on the switching device while one or more of the Fuses have been left out of the holder,

ίο meets the end 497 of the arm 495 on the switch cover 313 and blocks a downward movement of the housing 431, as in FIG. 9 shown. The End 497 of arm 495 is of such a width that it prevents housing 431 from engaging handle 461 in Rotate counterclockwise to release release lever 379. Hence the handle 461, biased by spring 463, hold the trip lever in its unlocked position until the fuse holder removed and the missing fuse replaced so that all three fuses are in place are in the holder. While the fuse connections 415 and 421 in the corresponding plug contacts 416 and 419 are plugged in, no current can flow because the switch contacts are open and not can be closed because the mechanism cannot be cocked as long as the release lever 379 is held in the release position by the lever 461.

In summary: The invention creates a switching device that controls one manually and automatically Circuit breaker to be operated and thus series-connected current-limiting fuses has high breaking capacity. The switch-off characteristics of the two agents are related in such a way that that the circuit breaker in a conventional manner to fault currents below its breaking capacity responds, and the fuses come into action to interrupt fault currents that are close to or are greater than that which the circuit breaker can safely interrupt. The circuit breaker is on one own insulation housing mounted, and the fuses are partially on the switch housing and partly mounted on a lug which is rigidly attached to the load end of the housing. They are means provided to the tensioning of the switch mechanism and closing of the switch contacts in the connection to prevent a fuse from responding until the burnt fuse is removed. Means are provided to prevent the switch mechanism from being cocked when a fuse responds and until the fuse housing is removed and put back into place, and all fuses are in place on the fuse housing. Further funds are provided to block the full insertion of the fuse holder in place on the breaker, if one of the fuses is omitted from the switch housing, thereby cocking the switch mechanism prevented until all fuses are in place on the fuse housing.

In the arrangement according to FIGS. 1 to 3, it should be noted that the feeler finger 166 is on the removable Safety cover or holder 131 are mounted and can be removed with this.

This has the advantage that the movement of the fingers against their springs 168 takes place when the individual fuses are brought into place, and if the fuse holder is

ter is separated. This means that the proper fit of the fuses with respect to the fingers is visual can be checked before the holder is put in place. Also needs the insertion movement not to move the feeler finger when inserting the holder. Another advantage of this invention is that the sensing fingers are independent of the plug contacts 116 and 119 and cannot influence the establishment of a proper electrical contact.

Also with the arrangement according to FIGS. 4 to 9 the knee pieces 469 and the knee brackets 483 are mounted on the removable fuse holder 431 and are removed with this from the switching device. This has the advantage that the position of the knee 469 or knee flexor 483 can be checked with the eyes before the Holder is brought into its position on the switching device.

20th

Claims (6)

Patent claims: 1. Interlocked switching device dependent on electrical fuses, consisting of a circuit breaker and a fuse link whose fuses are connected in series with the circuit breaker respond in the event of overcurrents exceeding the rated breaking capacity of the switch, where the circuit breaker and fuse link are arranged on a common base, characterized in that means are provided in the case of a multi-pole arrangement of the device that the switching on of the circuit breaker is only possible when it is in the operating position Allow operational fuse links for all poles, and that these means of jacks the receiving device for the fuse links are independent. 2. Switching device according to claim 1, characterized in that sensing elements (166, 149; 469, 471) are provided, which in the absence of one of the fusible links (113; 413) on the trigger mechanism (153,159,81; 445,381) of the circuit breaker act. 3. Switching device according to claim 2, characterized in that the sensing elements (166; 469) on the receiving device (131; 431) for the fuse inserts (113; 413) are attached. 4. Switching device according to claim 2, characterized in that the receiving device (131; 431) is designed as a cover. 5. Switching device according to claim 1, characterized in that means (485, 495) are provided are that allow the mounting of the receiving device (431) on the switch only when the receiving device located in the operating position operable fusible links (413) for contains all poles. 6. Switching device according to claim 1, characterized in that the triggering device of the Circuit breaker by a member controlled by the cover (131; 431) of the fusible links (161, 163; 461, 465), by the mechanical actuator of each fuse link (143; 483) and through each sensing element (166; 469) for the presence of a fuse link (113; 431) can be triggered and kept triggered. For this purpose 2 sheets of drawings 609 607/294 7.66 © Bundesdruckerei Berlin