EP2345056A1 - Electrical overcurrent relay having a rocker which is borne such that it can pivot - Google Patents
Electrical overcurrent relay having a rocker which is borne such that it can pivotInfo
- Publication number
- EP2345056A1 EP2345056A1 EP09744955A EP09744955A EP2345056A1 EP 2345056 A1 EP2345056 A1 EP 2345056A1 EP 09744955 A EP09744955 A EP 09744955A EP 09744955 A EP09744955 A EP 09744955A EP 2345056 A1 EP2345056 A1 EP 2345056A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker
- closed position
- spring
- contact
- snap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000994 depressogenic effect Effects 0.000 claims description 5
- 230000008030 elimination Effects 0.000 claims description 4
- 238000003379 elimination reaction Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
- H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H2071/109—Operating or release mechanisms with provisions for selecting between automatic or manual reset
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
- H01H5/04—Energy stored by deformation of elastic members
- H01H5/06—Energy stored by deformation of elastic members by compression or extension of coil springs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
Definitions
- the invention relates to an overload relay, with a pivotally mounted rocker on which at least one movable contact piece of a contact point is mounted, wherein the rocker overflow occurs in the event of overcurrent due to the action of a thermal release from a first closed position to a second closed position, and with a between a first and a second position convertible changeover to manual or automatic provision of the rocker from the second to the first closed position, according to the preamble of claim 1.
- An electrical overload relay is used to protect an electric motor against overcurrents.
- Known overcurrent relays have as thermal tripping elements thermobimetals, which are heated by the overcurrents and deflect, thereby opening or closing a switch contact point.
- the rocker In manual operation, the rocker remains in its second closed position until it is forcibly returned to its first closed position due to the operation of a reset member by an operator from the outside.
- the rocker In automatic mode, the rocker automatically snaps back to its first closed position as soon as the overcurrent stops.
- a generic overload relay has a changeover device, which can be changed from outside the device by an operator from a first to a second position.
- the first position corresponds to the setting "Automatic mode”
- the second position corresponds to the setting "Manual mode”.
- the invention is therefore characterized in that the rocker is held by a snap spring in its first and second closed position and can snap against the restoring force of the snap spring on a dead center between the two closed positions that cooperates with the rocker a functional spring, that this one Snapping the rocker supported from the first to the second closed position, and that the functional spring under the influence of the switching device can release a snap back of the rocker from the second to the first closed position or block.
- the rocker both in automatic and in manual operation snaps from its first stable closed position to its second, stable closed position.
- the contact distance in manual and in automatic mode is the same.
- the rocker presses in its first stable closed position, the function spring counter to their restoring force in a first operative position in which the function spring acts by its restoring force the rocker in the direction of the second closed position.
- the functional spring acts both in automatic and in manual operation to assist opening.
- the changeover device comprises a push button, which is depressed in its first position and thereby holds the functional spring in an intermediate position in which this the rocker after exceeding the dead center in the second closed position for snapping back into the first Closed position releases.
- the overload relay is thus in automatic mode, because an immediate snap back of the rocker after the overcurrent has subsided is made possible.
- An advantageous embodiment is characterized in that the push button releases the functional spring in its second position, so that it acts on the rocker even after exceeding its dead center in the direction of the second closed position.
- the overload relay is thus in manual operation, because an immediate snap back of the rocker after the overcurrent has subsided is prevented by the functional spring, which continues to open the rocker. Only by manual reset from the outside can the rocker be snapped back.
- An advantageous embodiment is characterized in that a first rocker arm cooperates with a first contact point and a second rocker arm with a second contact point so that in the first closed position of the rocker the first contact point is closed and the second contact point is opened, and in the second closed position the rocker opens the first contact point and the second contact point is closed.
- an actuator according to the invention in an overload relay with an opener / closer - arrangement is possible.
- An advantageous embodiment is characterized in that a first contact bridge is mounted on the first rocker arm and a second contact bridge for the electrically conductive bridging of at least two fixed contact pieces is mounted on the second rocker arm. This makes it possible to use an actuating device according to the invention in an overload relay with an opener / closer arrangement in which each contact point is possible as a double contact point with two fixed contact pieces which can be bridged by a contact bridge carrying the two movable contact pieces.
- An advantageous embodiment is characterized in that the contact pressure force is applied to the second contact point in the second closed position of the rocker by the snap spring.
- An advantageous embodiment is characterized in that the contact pressure force is applied to the first contact point in the first closed position of the rocker by a contact pressure spring.
- the pivoting back of the rocker from the second closed position over the dead center in the first closed position is supported by the contact pressure spring after elimination of the effect of the thermal release, so that a snap back of the rocker can be made from the second to the first closed position.
- Show it: 1 is a schematic side view of an actuator according to the invention for an overload relay with a single break, in the automatic mode, with a closed NC,
- FIG. 2 shows schematically a side view of an actuating device according to the invention for an overload relay with a single interruption, in the automatic mode, with a normally open contact
- FIG. 3 shows a schematic side view of an actuating device according to the invention for an overload relay with a single interruption, in the manual operating mode, with the normally closed contact,
- FIG. 4 is a schematic side view of an actuating device according to the invention for an overload relay with a single interruption, in the manual operating mode, with the normally open contact,
- FIG. 5 shows schematically a side view of an actuating device according to the invention for an overload relay with a double interruption, in the automatic mode, with a normally closed contact
- FIG. 6 is a schematic side view of an actuating device according to the invention for an overload relay with a double interruption, in the automatic mode, with the normally open contact,
- Fig. 7 shows schematically a side view of an actuator according to the invention for an overload relay with a double break, in the manual mode, with a closed NC, and
- FIG. 8 is a schematic side view of an actuating device according to the invention for an overload relay with a double interruption, in the manual operating mode, with the normally open contact.
- Figure 1 shows a partial section of an electrical overcurrent relay 1, with a housing 2 in which a shift key 40 in the form of a push-button can be pressed by actuation from outside the housing and let out again.
- the shift key 40 is shown schematically as a cylindrical body with an actuating extension 41, wherein the cylindrical body 40 is accessible with its operating side 42 from outside the housing for actuation.
- the exact nature of the storage of the shift key, such as their interaction with a return spring and the required locking and unlocking mechanisms are not shown here in detail, since any known configuration can be used for this purpose.
- a rocker 20 is further arranged in the form of a double lever, with a first arm 22 and a second arm 23.
- the first arm 22 is associated with a first contact point 17.
- the second arm 23 is associated with a second contact point 12.
- the rocker 20 has approximately centrally a bearing extension 21 which is integrally formed approximately perpendicular to the first arm 22 and is mounted with its free end in a housing-fixed bearing cup 201.
- a pivot point 202 for the rocker 20 is formed on the bearing cup, by which it can be pivoted in the direction of arrow P.
- the rocker 20 is supported with its bearing extension 21 so on a cutting bearing, which includes the bearing cup 201 and the free end of the bearing extension 21.
- other known storage methods and devices can be used, as long as they perform the same function, namely to allow a pivotable mounting of the rocker 20 in the housing 2.
- a pin 24 Approximately in the middle between the first and second arm 22, 23, in the neck region of the bearing extension 21 is located on the rocker 20, a pin 24. At this pin 24 a snap spring 30 is mounted, the other end to a below the cutting bearing and the Lüpfanne 201 fixed to the housing anchored articulation point 31 is attached. The imaginary connecting line between the pin 24 and the pivot 202 bears the reference numeral 241.
- the rocker 20 with the snap spring 30 forms a snap-action mechanism.
- the restoring force of the snap spring 30 acts on the articulation point 24 and acts in the direction of arrow K, on the left, the second arm associated side of the rocker 20. As a result, it pulls the rocker 20 counterclockwise to a position in which the rocker 20 itself in its first stable position or in its first closed position.
- the first contact point 17 is closed, this is therefore also referred to as an opener.
- the second contact point 12 is open, it is therefore also referred to as a closer.
- the first contact point 17 comprises a fixed contact 15 and a movable contact 16 fixed to a pivotably mounted contact arm 18.
- the contact pressure force is applied to the first contact point 17 by a contact pressure spring 60 acting on the contact arm 18.
- This is hinged at its other end to an adjusting element 70, which can be adjusted in the direction of arrow E up or down, so that the contact pressure force is adjustable.
- the second contact point 12 comprises a fixed contact 10 and a movable contact 11 fastened to the free end of the second arm 23 of the rocker 20.
- the second contact point is opened. In its closed position, which will be described below, the contact pressure force is applied to the second pad 12 by the snap spring 30, as will be shown below.
- a function spring 50 is further attached.
- this is designed as a leg spring with a first and a second spring arm 51, 52 which is mounted in a housing-fixed axis 53 and the restoring force acts in the opening direction of the angle formed by the two spring arms 51, 52 angle.
- the first arm 51 is supported fixed to the housing, and the second arm 52 presses with its free end resiliently against a stop 25 on the second arm 23 of the rocker 20 and acts on these in the direction of arrow F with a functional force, which Rocker 20 is looking to turn clockwise.
- the function spring 50 is here in its first operative position.
- the pulling force K which exerts the snap spring 30 on the rocker 20 in the counterclockwise direction, is so great that it holds the rocker 20 against the restoring force F of the functional spring 50 in the first stable position.
- the push button 40 is depressed so that its actuating extension 41 comes to lie in the vicinity of the second arm 52 and thereby allows the second arm 52 only a very small range of motion upwards, ie in the opening direction of the leg spring 50.
- the overcurrent relay is in the automatic mode, as will be apparent below.
- the push button can be executed and stored in a known manner. It can be held against the restoring force of a spring, for example, by pressing and twisting in a latching position in the depressed position. To release, it is then first turned back out of the detent position so that the spring can then push it out again.
- the overcurrent relay 1 is shown in the tripped state.
- the zugfederbte by the snap spring 30 rocker 20 is pivoted or snapped clockwise into its second stable position or its second closed position.
- a release force A which is the thermal release, optionally with the interposition of an actuating element and a lever and / or slide arrangement - not shown here -, on the bearing extension 21 and on the snap spring 30, so on the
- Snap-action mechanism exercises. This can be done so that the actuator acts on the snap spring and presses clockwise down to the left until the dead center, also referred to as dead center, is reached and overcome and the snap spring 30 then in the course of the rocker 20 in the second stable closed position draws.
- the snapping can also be caused by the fact that the actuating element exerts a triggering force on the bearing extension 21.
- the release force is indicated in Figure 2 for this case by an arrow A.
- all known th triggering and slide assemblies are used according to the invention, therefore, it will not be discussed in more detail in the present invention and the figures.
- the release force A supported by the functional force F of the functional spring 50, first pivots the rocker 20 clockwise until the force arrow K of the snap spring 30 is in line with the imaginary connecting line 241 between the pin 24 and the pivot point 202 is located. This is the dead center position or the dead center of the rocker 20. If the tripping force A in this position presses a little further clockwise, then the force of the snap spring 30 pulls to the right of the imaginary connection line 241, thereby clockwise the rocker is further pivoted and snaps into its second stable position shown in FIG.
- the rocker 20 In the second stable position, also called the second closed position, the rocker 20, the second contact point 12 is closed and the first contact point 17 is opened, wherein at the first contact point 17 of the full contact distance is reached.
- the second arm 22 of the rocker 20 presses the contact arm 18 against the restoring force of the contact pressure spring 60 down.
- the contact pressure force at the second pad 12 is applied by the snap spring 30.
- the second spring arm 52 of the function spring 50 is blocked by the actuating extension 41 of the shift key 40, so that it can no longer press on the stop 25 in the second closed position of the rocker 20.
- the restoring forces of the contact pressure spring 60, the snap spring 30 and the release force A are coordinated so that the superposition of the release force A with the force K of the snap spring 30 is sufficient to open the first contact point 17 against the restoring force of the contact pressure spring 60 hold.
- the magnitude of the restoring force of the contact pressure spring 60 can be adjusted with the adjusting member 70. Now, if the overcurrent is no longer applied, so eliminates the triggering force A again.
- the force K of the snap spring 30 alone can not hold the rocker 20 against the restoring force of the contact pressure spring 60. Therefore, the rocker 20 is now pivoted counterclockwise under the influence of the contact pressure spring 60 in the dead center position and a little way beyond, from where it snaps back into its first stable position shown in FIG.
- the restoring force of the contact pressure spring 60 can be adjusted so that it is neither too large, thereby opening the first contact point 17 would be prevented, nor too small, whereby an automatic reset of the rocker 20 could not be done.
- FIGS. 1 and 2 show the override relay 1 in the "manual reset" operating mode
- the switchover key 40 is now exposed, thereby resulting in a greater distance between the actuating projection 41 the shift key 40 and the second spring arm 52 of the function spring 50 is, as in the "automatic" mode according to Figures 1 and 2 with pressed-shift key.
- rocker 20 If the rocker 20 is to be set back into its first stable position from this position, a corresponding manual reset force M must be exerted on the rocker from the outside via a reset button, which forcibly pivots it counterclockwise over the dead center position, so that it can move from From there back to the first stable position can snap back.
- the reset force M can, for example, be exerted on the first arm 23 of the rocker 20 via a suitable lever arrangement, as indicated by the arrow M in FIG. 4.
- a suitable lever arrangement as indicated by the arrow M in FIG. 4.
- the arrangement of an externally operable reset button or reset switch with an associated lever assembly for acting on the rocker in the manual reset operation is known in principle and should therefore not be shown here for the sake of clarity of illustration.
- Figures 5 to 8 show an electrical overload relay 1 similar to that shown in Figures 1 to 4, with the difference that in the embodiment according to Figures 5-8, the first and second contact point 17, 12 are each designed as a double contact point.
- the first contact point 17 thus comprises two fixed contacts 151, which are conductively bridged when the contact point is closed via two movable contact pieces mounted on a movable contact bridge 161.
- an adjusting element for the contact pressure spring 60 is here an adjusting screw 701st
- the second contact point 12 comprises two fixed contacts 101, which are conductively bridged when the contact point is closed via two movable contact pieces mounted on a movable contact bridge 111.
- the contact bridges 111, 161 can also be designed as so-called double contact bridges.
- a double contact bridge connects two adjacent pairs of contacts, ie a total of 4 contacts, with each other.
Landscapes
- Breakers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008056998 | 2008-11-12 | ||
DE102009043780A DE102009043780B4 (en) | 2008-11-12 | 2009-09-30 | Electrical overload relay with a swivel mounted rocker |
PCT/EP2009/007524 WO2010054739A1 (en) | 2008-11-12 | 2009-10-21 | Electrical overcurrent relay having a rocker which is borne such that it can pivot |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2345056A1 true EP2345056A1 (en) | 2011-07-20 |
EP2345056B1 EP2345056B1 (en) | 2012-08-08 |
Family
ID=42105333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09744955A Active EP2345056B1 (en) | 2008-11-12 | 2009-10-21 | Electrical overcurrent relay having a rocker which is borne such that it can pivot |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2345056B1 (en) |
CN (1) | CN102217023B (en) |
DE (1) | DE102009043780B4 (en) |
WO (1) | WO2010054739A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018202488A1 (en) | 2017-05-03 | 2018-11-08 | Eaton Intelligent Power Limited | Snap-action switch having a current-conducting snap-action spring, method for producing such a snap-action switch, and overload relay and tripping indicator having such a snap-action switch |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104795287B (en) * | 2015-04-30 | 2017-11-03 | 浙江天正电气股份有限公司 | A kind of breaker of flexible energy storage component |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3866156A (en) * | 1973-12-26 | 1975-02-11 | Bernard Dimarco | Overload relay indicating means |
FR2536905A1 (en) * | 1982-11-25 | 1984-06-01 | Telemecanique Electrique | THERMAL RELAY |
DE29917173U1 (en) * | 1999-09-30 | 2000-08-24 | Abb Patent Gmbh, 68309 Mannheim | Actuator for an electrical overcurrent relay |
DE102005043655B4 (en) * | 2005-09-13 | 2007-10-25 | Siemens Ag | Method for operating an electrical switching device and operated according to this method electrical switching device |
-
2009
- 2009-09-30 DE DE102009043780A patent/DE102009043780B4/en not_active Expired - Fee Related
- 2009-10-21 CN CN200980145647.0A patent/CN102217023B/en not_active Expired - Fee Related
- 2009-10-21 WO PCT/EP2009/007524 patent/WO2010054739A1/en active Application Filing
- 2009-10-21 EP EP09744955A patent/EP2345056B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010054739A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018202488A1 (en) | 2017-05-03 | 2018-11-08 | Eaton Intelligent Power Limited | Snap-action switch having a current-conducting snap-action spring, method for producing such a snap-action switch, and overload relay and tripping indicator having such a snap-action switch |
Also Published As
Publication number | Publication date |
---|---|
DE102009043780B4 (en) | 2011-01-27 |
DE102009043780A1 (en) | 2010-05-20 |
CN102217023B (en) | 2014-02-12 |
CN102217023A (en) | 2011-10-12 |
WO2010054739A1 (en) | 2010-05-20 |
EP2345056B1 (en) | 2012-08-08 |
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