NZ239076A - Twin fulcrum switch mechanism for residual current circuit breaker - Google Patents
Twin fulcrum switch mechanism for residual current circuit breakerInfo
- Publication number
- NZ239076A NZ239076A NZ23907691A NZ23907691A NZ239076A NZ 239076 A NZ239076 A NZ 239076A NZ 23907691 A NZ23907691 A NZ 23907691A NZ 23907691 A NZ23907691 A NZ 23907691A NZ 239076 A NZ239076 A NZ 239076A
- Authority
- NZ
- New Zealand
- Prior art keywords
- fulcrum
- switch mechanism
- contact
- contact carrier
- mechanism according
- Prior art date
Links
Landscapes
- Breakers (AREA)
Description
■ 23907e(242376
• I
NEW ZEALAND PATENTS ACT, 1953
Cognated from
No: 239076 Dated: 22 July 1991 No: 242376 Dated: 15 April 1992
COMPLETE SPECIFICATION Switch Mechanism
WE, PDL HOLDINGS LIMITED, a New Zealand company of 14 Hazeldean Road, Christchurch, New Zealand hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:-
g39 07c(24237 6
This invention relates to a switch mechanism and more particularly to a residual current device (RCD) incorporating the mechanism.
An RCD is a safety device which cuts power to an electrical appliance or other load in the event of certain faults. The device senses current imbalance between active and neutral power conductors resulting from earth currents created by the faults. A differential transformer generates an out of balance signal which is electronically amplified and compared with a predetermined threshold. Exceeding the threshold disables a switch mechanism and opens a contact set to cut the power. Several switch mechanisms are known but most are too expensive or bulky or otherwise unsuitable for general use.
It is an object of the present invention to provide a cheaper and more compact switch mechanism for RCDs or at least to provide the public with a useful choice.
Accordingly in one aspect the invention may be said to consist in a switch mechanism that is opened in the event of an electrical fault condition, comprising a contact set having a movable contact means supported on a contact carrier and a force is applied to bias the contact carrier against one or other of two spaced fulcrums, about which the contact carrier is respectively pivoted, only one of the fulcrums being operable with the contact carrier at one time and in a manner that movement about a first of said fulcrums causes the contact set to close, and movement about a second of said fulcrums causes the contact set to open, the first fulcrum being movable by an electromechanical means in response to the fault condition to become inoperable, allowing the contact carrier to move and operate about the second fulcrum thereby opening the contact set, the contact carrier being movable by a manual reset means so that under a no faultjsondition the
.239076(242376
second fulcrum becomes inoperable and the contact carrier moves to operate about the first fulcrum thereby closing the contact set.
Preferably the electromechanical device comprises a solenoid and plunger, the plunger being released to move the first fulcrum position when the solenoid is de-energised and then being restored by operation of the contact carrier about the second fulcrum position during opening of the contacts.
Preferably an indicator is mounted on the contact carrier so that the open or closed state of the contact set is apparent.
In a further aspect the invention may be said to consist in a residual current device incorporating a switch mechanism according to the preceding paragraphs.
General principles of the invention and a preferred embodiment will be described with reference to the accompanying drawings of which:
Figure 1 is a diagrammatic representation of the switch mechanism with the contact set closed;
Figure 2 shows the beginning of an undervoltage release of the contact carrier from the first fulcrum position;
Figure 3 shows movement of the carrier to pivot about the second fulcrum position;
Figure 4 shows the contact set open;
Figure 5 shows the beginning of a reset operation in an undervoltage condition;
Figure 6 shows the reset operation nearly complete in a normal voltage condition;
Figure 7 shows the switch mechanism and an iQ^eaiQt^with the contact set closed;
2.3907^242376
Figure 8 shows the indicator of Figure 7 with the contact set open;
Figure 9 is an example RCD circuit which may incorporate the switch mechanism;
Figure 10 is a side view of a preferred RCD with the contacts closed;
Figure 11 is a section of the RCD in Figure 10;
Figure 12 is a side view of the preferred RCD with the contacts open;
Figure 13 is a section of the RCD in Figure 12;
Figure 14 is an underside view of the preferred RCD;
Figure 15 is an overhead view of the preferred RCD;
Figure 16 is an end view of the preferred RCD; and
Figure 17 is an isometric view of the lever assembly and a differential transformer in the preferred RCD.
Referring to these drawings, Figures 1 to 8 are intended to demonstrate the general principles of a switch mechanism according to the invention. Figures 9 to 17 show how a preferred embodiment of the mechanism may be incorporated in an RCD. The switch is normally open until mains power is applied to energise an electromechanical device such as a solenoid. Manually operating a reset device, such as a push button, then closes the contact set and provides power to a load. If mains power is removed or if a control circuit detects an out of balance current flow, the solenoid is de-energised to trip a lever system and the contacts spring open.
As shown in Figures 1 to 6, the contact set comprises a fixed contact 1 mounted on an appropriate support and a movable contact 2 mounted on a contact lever or contact carrier 3. The moveable contact carrier is able to pivot about either of a first fulcrum position 4 on swing arm 5 or a second fulcrum position 8 on the support. Spring 9 provides a force oi^bg^arrier between the fulcrums and causes the pivoting when rec
2.39 07 a 2^2 37 6
Figure 8 shows the indicator of Figure 7 with the contact set open;
Figure 9 is an example RCD circuit which may incorporate the switch mechanism;
Figure 10 is a side view of a preferred RCD with the contacts closed;
Figure 11 is a section of the RCD in Figure 10;
Figure 12 is a side view of the preferred RCD with the contacts open;
Figure 13 is a section of the RCD in Figure 12;
Figure 14 is an underside view of the preferred RCD;
Figure 15 is an overhead view of the preferred RCD;
Figure 16 is an end view of the preferred RCD; and
Figure 17 is an isometric view of the lever assembly and a differential transformer in the preferred F<CD.
Referring to these drawings, Figures 1 to 8 are intended to demonstrate the general principles of a switch mechanism according to the invention. Figures 9 to 17 show how a preferred embodiment of the mechanism may be incorporated in an RCD. The switch is normally open until mains power is applied to energise an electromechanical device such as a solenoid. Manually operating a reset device, such as a push button, then closes the contact set and provides power to a load. If mains power is removed or if a control circuit detects an out of balance current flow, the solenoid is de-energised to trip a lever system and the contacts spring open.
As shown in Figures 1 to 6, the contact set comprises a fixed contact 1 mounted on an appropriate support and a movable contact 2 mounted on a contact lever or contact carrier 3. The moveable contact carrier is able to pivot about either of a first fulcrum position 4 on swing arm 5 or a second fulcrum position 8 on the support. Spring 9 provides a force or between the fulcrums and causes the pivoting when rec
£39 07 5^42 37 6
« «
close the contacts. A sufficient voltage applied to solenoid 6 holds "plunger
7 from acting on arm 5. On an undervoltage condition the plunger is released to impact arm 5 to disengage fulcrum 4 from carrier 3 and allow the carrier to pivot about fulcrum 8. Button 10 is mounted on the support and pushes on carrier 3 through shaft 101 to move the carrier away from fulcrum
8 and allow pivoting about fulcrum 4 in resetting the mechanism. Arms 42 and 43 extend from carrier 3 and arm 5 respectively, and interact to restore the plunger within the solenoid during pivoting of the carrier about fulcrum 8.
Referring to Figure 1, the contact set is shown closed in a no fault working condition of the switch. Spring 9 pushes one end of carrier 3 against fulcrum 4 and at the other end contact 2 is pushed against contact 1. There is a clearance between carrier 3 and fulcrum 8. Plunger 7 is held in solenoid 6 against a bias spring by a voltage derived from the mains with a gap to arm 5.
Referring to Figure 2, initial movement of the mechanism is shown on occurrence of a fault. The voltage to solenoid 6 has been dropped and plunger 7 is ejected by the bias spring to impact and deflect swing arm 5.
This disengages fulcrum 4 from carrier 3.
Continuing the movement as shown in Figure 3 opens the contact set.
Spring 9 pushes carrier 3 towards fulcrum 8 about which the carrier pivots.
This separates the contacts breaking current to the load. Arms 42 and 43 have moved together.
In Figure 4, the contact set is shown fully, open. Carrier 3 has pivoted to maximum about fulcrum 8. Arm 42 on carrier 3 has pushed arm 43 on swing arm 5 past the position of Figure 1 and restored plunger 7 within the solenoid. This action reduces the size and cost of the s
2390761242376
»
The plunger is* pushed against the solenoid biafe spring indirectly by spring
• v'i
9. . \
Referring to Figure 5, a reset operation is, shown attempted with the solenoid de-energised. For example, there may be low mains voltage or an active or neutral open circuit on the line side of the contacts. Arm 42 is omitted for clarity. As button 10 reciprocates( shaft 101 pushes carrier 3 away from fulcrum 8 against spring 9. Plunger J is correspondingly released from solenoid 6 deflecting swing arm 5 so that fulcrurri 4 cannot engage the
* ' • •
carrier. This simply returns the mechanism;,to the state of Figure 4 on releasing the button.
In Figure 6 a reset becomes possible as the solenoid is energised by a normal voltage. On pushing carrier 3 away fronrt fulcrum 8, plunger 7 now remains held in solenoid 6. The carrier slides over fulcrum 4 and swing arm 5 is maintained in a position for their engagement ^.Pressjurf on button 10 is removed and spring 9 pushes carrier 3 to engage fulcrum 4 at one end, followed by pivoting to close the contact set. This returns the mechanism to the state of Figure 1. In an RCD if a fault on the load side remains, the solenoid will be de-energised and the switch will immediately trip after resetting.
Figures 7 and 8 show a means which indicates whether power is being supplied to the load. An arm 11 is mounted on carrier 3 and carries a flag 12 which is visible in opening 13 when contacts 1 and 2 are closed. On a fault the carrier 3 pivots to open the contacts and moves the flag to a less visible position, making it apparent that the fault has occurred.
Figure 9 shows a control circuit which could be used with the switch mechanism of Figures 1 to 8 in an RCD. This is based on a Raytheon RV4145 gro J fault interrupter integrated circuit 20. A diffal^nfidfl \6rto
239 07 6\^42 376
transformer 15" has mains active and neutral conductors 16 and 17 passing centrally through a core over which is wound a secondary winding 18 of high inductance. The conductors are effectively anti-phased primary windings such that normal load currents cancel each other resulting in zero output voltage from the secondary winding. An output voltage is developed when a small residual current from the load active flows back to line neutral indirectly, usually via ground, from a faulty appliance or cable connected in the load.
A metal oxide varistor 34 is provided to limit peak mains transients from causing damage to the circuit or any attached appliance. Power is supplied to the circuit by a half wave rectifier 35 and current limiting resistor 36. Capacitor 33 is charged and applies a voltage to solenoid 6 which retains plunger 7 so that contacts 1, 2 can be closed. Action of the plunger in the switch mechanism is indicated by the dashed line. As IC 20 draws very little quiescent current, resistor 37 is used as a simple voltage dropper,
with capacitor 38 provided as a precaution against electrical noise problems rather than as a supply filter.
One end of coil 18 is connected to IC 20 at pin 3 which is a common amplifier reference point. Capacitor 19 filters high frequency noise from the secondary voltage, while capacitor 22 provides noise bypassing from the bulk of the coil to IC 20 at ground pin 4. The active end of coil 18 is connected to an amplifier summing junction at pin 1 through capacitor 25 and resistor 26. Resistors 27 and 26 determine the amplifier gain while capacitor 25 series resonates with the coil inductance and is designed to extract mains frequency signal components from loads which use half wave power control. Otherwise the core would saturate from the resulting DC and product very
239076(2*2376
little output to trip the switch. Capacitor 28 provides amplifier high frequency roll off.
The amplifier output is internally connected to comparators which are referenced to zener diodes in IC 20. When the amplified signal detected on pin 1 exceeds the zener thresholds, an output signal at pin 5, filtered by a capacitor 30, triggers a silicon controlled rectifier 31. The SCR 31 latches via the current limiting resistor 32 and temporarily discharges capacitor 33 creating an undervoltage condition on solenoid 6. This releases plunger 7 to cause opening of the contacts, turning off power to the load. Capacitor 33 then recharges to allow closing of the contacts in a reset operation.
A circuit test means is provided by which unbalanced current is passed through the transformer core to check action of the switch. Button 14 is pressed to complete a link between the active and neutral conductors, taking a portion of the active current determined by resistor 39 through the transformer twice. This simulates a residual current flowing from the neutral conductor and escaping to earth.
Figures 10 to 17 show a preferred switch mechanism using the principles outlined with respect to Figures 1 to 8, incorporated in an RCD. Most of the circuit components outlined with respect to Figure 9 have been omitted for clarity. The RCD structure is built around a printed circuit board 50 and plastics casing elements 51, 52 clipped together at 53, 54, 55. Using references as in Figures 1 to 8 the structure comprises two pairs of contacts 1 and 2, moveable contact lever or moveable contact carrier 3, first fulcrum means 4 on swing arm 5, solenoid 6 and plunger 7, second fulcrum means 8, carrier pivoting spring 9, reset means 10, extensions 42 and 43 on carrier 3 and arm 4 respectively, indicator arm 11, flag 12 and view opening 13. This structure also shows spring 70 which ejects plungey^SrVsotfenNid 6
239076(242376
and spring 71 which ensures proper latching of fulcrum 4 on lever 3. Using references as in Figure 9 the structure comprises differential transformer 15,
active and neutral conductors 16, 17, test means 14 and conductor 40. In fixing the RCD between mains and a load, the conductors are connected at terminals 60, 61 and 62, 63 respectively.
Referring to Figures 10 and 11 the RCD is shown with the contact pairs closed. The mains active line would be connected to terminal 60 so that current flows through contacts 1, 2, a plate 85 (shown in Figure 17), conductor 16 and terminal 61, from there to the load. The mains neutral line and load are similarly connected on the other side of the device which appears identical. End 80 of the contact carrier 3 is engaged by fulcrum 4 under force from spring 9. Fulcrum 8 has two slots 90 acting as limiting means which loosely receive axles 81, 82 of the contact carrier which acts as locating means. The second fulcrum 8 is formed by abutment between the axles and the end of the slots. Plunger 7 is held to block 73 within solenoid 6 against spring 70 with a gap to arm 5 by a voltage derived from the mains.
Flag 12 is apparent in opening 13.
Referring to Figures 12 and 13 the RCD is shown tripped with the contact pairs open. Contacts 1 and 2 are separated to interrupt current flow to the load. End 80 of the contact carrier 3 has disengaged from fulcrum 4, and axles 81, 82 (shown in Figure 17) are engaged in slots 90 on fulcrum 8 under force from spring 9. Plunger 7 was released to impact and deflect arm 5 after de-energisation of the solenoid but is shown restored after action of extension 42 on extension 43. Flag 12 is no longer apparent through opening 13.
Referring to Figures 14 and 15 the RCD underside and topskrecT^
o\
shown as they appear with the contacts closed. Current passe/through ^
* 3 o ,M n
U A» ** j
239 07 6/242376
terminals 60, 62, plates 85, 86 on contact carrier 3, conductors 16, 17 and terminals 61,63 as can be seen. Solenoid 6 is energised to hold plunger 7.
Flag 12 is apparent through opening 13.
Referring to Figure 16 an end view of the RCD shows conductors 16, 17 passing through differential transformer 15, and also an inside view of test button 14. Pushing the button takes a predetermined portion of mains current across contact bar 100 and along conductor 40 through the transformer to simulate a fault.
Referring to Figure 17 the contact carrier 3 and differential transformer 15 are shown separated from the RCD. The carrier supports movable contacts 2 and plates 85, 86 through which the contacts are connected to conductors 16,17. Indicator arm 11 and flag 12 are centrally placed between axles 81, 82 which engage fulcrum 8 in Figures 10 and 12. Extension 42 is an inverted pocket which engages one end of spring 9 in Figures 11 and 13. When the RCD is being set, two rods 101 from button 10, only one of which is shown in Figures 11 and 13, are pushed down to engage dimples 83, 84. This depresses the entire moveable contact carrier against spring 9 and allows end 80 to engage fulcrum 4 provided the solenoid is energised.
Figures 12 and 17 also show a third fulcrum means 150 as a protrusion on one end of lever or carrier 3 opposite the moveable contacts 2. Contacts 1 and 2 are occasionally tack welded together by a current surge and may be forced apart by the manual reset button 10. On depressing the button as shown in Figure 5 the protrusion 150 eventually meets the casing 52 shown in Figure 10 and 12, and acts as a stop or pivot point for further force applied to the lever or carrier 3 through rod 101 to act on the joined
23 9 0 7 6/2 A 2 3 7 6
contacts. A considerable manual force may thereby be applied to break the tack weld and open the contacts if necessary.
••*
■
•*\\ e
'V
Ij I9g6 *1
2239 O7 Rl 242 37 6
Claims (14)
1. A switch mechanism that is opened in the event of an electrical fault condition, comprising a contact set having a movable contact means supported on a contact carrier and a force is applied to bias the contact carrier against one or other of two spaced fulcrums, about which the contact carrier is respectively pivoted, only one of the fulcrums being operable with the contact carrier at one time and in a manner that movement about a first of said fulcrums causes the contact set to close, and movement about a second of said fulcrums causes the contact set to open, the first fulcrum being movable by an electromechanical means in response to the fault condition to become inoperable, allowing the contact carrier to move and operate about the second fulcrum thereby opening the contact set, the contact carrier being movable by a manual reset means so that under a no fault condition the second fulcrum becomes inoperable and the contact carrier moves to operate about the first fulcrum thereby closing the contact set.
2. A switch mechanism as claimed in Claim 1 wherein the contact carrier is linearly restricted in its movement by a limiting means which guides a locating means on the contact carrier.
3. A switch mechanism according to Claim 2, wherein the second fulcrum is formed by abutment between the locating means on the contact carrier and the limiting means, at an end ptffnt of the*lfi^erly In i m r\ 239076H376 m | I V restricted movement of the contact carrier. 4. A switch mechanism according to Claim 2 or Claim 3, wherein the limiting means comprises a slot and the locating means comprises a protrusion on the contact carrier which moves within the slot. 5. A switch mechanism according to Claim 4, wherein one end of the slot is closed and the second fulcrum is formed by abutment of the protrusion with said closed end of the slot. 6. A switch mechanism according to any one of the preceding claims, wherein the electromechanical means comprises a solenoid and a plunger assembly, the plunger assembly operating to move the first fulcrum to become inoperable in response to the fault condition, and the plunger assembly then being restored by movement of the contact carrier about the second fulcrum during opening of the contact set. 7. A switch mechanism according to Claim 6, wherein the first fulcrum is provided on a moveable arm which is separated from the plunger assembly, to provide a gap across which the plunger is ejected towards the moveable arm in response to the fault condition. 8. A switch mechanism according to any one of the preceding claims wherein the first fulcrum position is on a movable arm operable so that the first fulcrum will engage the contact carrier thereljy closing . ■*' * fi f the contact set. -V • restricted movement of the contact carrier.
4. A switch mechanism according to Claim 2 or Claim 3, wherein the limiting means comprises a slot and the locating means comprises a protrusion on the contact carrier which moves within the slot.
5. A switch mechanism according to Claim 4, wherein one end of the slot is closed and the second fulcrum is formed by abutment of the protrusion with said closed end of the slot.
6. A switch mechanism according to any one of the preceding claims, wherein the electromechanical means comprises a solenoid and a plunger assembly, the plunger assembly operating to move the first fulcrum to become inoperable in response to the fault condition, and the plunger assembly then being restored by movement of the contact carrier about the second fulcrum during opening of the contact set.
7. A switch mechanism according to Claim 6, wherein the first fulcrum is provided on a moveable arm which is separated from the plunger assembly, to provide a gap across which the plunger is ejected towards the moveable arm in response to the fault condition.
8. A switch mechanism according to any one of the preceding claims wherein the first fulcrum position is on a movable arm operable so that the first fulcrum will engage the contact car ig the contact set. • 239076(242376 V t I «
9. A switch mechanism according to Claim 8 wherein said movable arm has an extension upon which the contact carrier acts.
10. A switch mechanism according to any one of the preceding claims wherein the manual reset means exerts a force on the contact carrier between the two fulcrum positions.
11. A switch mechanism according to any one of the preceding claims wherein an indicator is mounted on the contact carrier so that an open or closed state of the contact set is apparent.
12. A residual current device incorporating a switch mechanism according to any one of the preceding claims.
13. A switch mechanism substantially as hereinbefore described with reference to the accompanying drawings.
14. A residual current device substantially as hereinbefore described with reference to the accompanying drawings. ;jat'":d Ti r-AY O,4 ^ 5 0 Yh'
Priority Applications (18)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ23907691A NZ239076A (en) | 1991-07-22 | 1991-07-22 | Twin fulcrum switch mechanism for residual current circuit breaker |
| NO922806A NO304860B1 (en) | 1991-07-22 | 1992-07-16 | A switching mechanism |
| TW081105679A TW392185B (en) | 1991-07-22 | 1992-07-17 | A switch mechanism and a residual current device |
| AU20394/92A AU665551B2 (en) | 1991-07-22 | 1992-07-20 | Switch mechanism |
| EP92306654A EP0526071B1 (en) | 1991-07-22 | 1992-07-21 | Switch mechanism |
| AT92306654T ATE191098T1 (en) | 1991-07-22 | 1992-07-21 | SWITCH MECHANISM |
| DE69230817T DE69230817T2 (en) | 1991-07-22 | 1992-07-21 | Switch mechanism |
| US07/917,862 US5457444A (en) | 1991-07-22 | 1992-07-21 | Switching mechanism |
| CA002074287A CA2074287C (en) | 1991-07-22 | 1992-07-21 | Switch mechanism with two fulcrums |
| ZA925490A ZA925490B (en) | 1991-07-22 | 1992-07-21 | Switch mechanism |
| JP4237554A JP2759022B2 (en) | 1991-07-22 | 1992-07-22 | Switch mechanism activated by undervoltage condition |
| KR1019920013016A KR0149682B1 (en) | 1991-07-22 | 1992-07-22 | Switch mechanism |
| MYPI95003106A MY125589A (en) | 1991-07-22 | 1992-07-22 | Switch mechanism |
| US08/202,952 US5517165A (en) | 1991-07-22 | 1994-02-28 | Switch mechanism |
| AU39043/95A AU694280B2 (en) | 1991-07-22 | 1995-11-24 | A residual current device |
| NZ280909A NZ280909A (en) | 1991-07-22 | 1996-01-30 | Shunt trip release switch for residual current device |
| JP9246904A JPH1074444A (en) | 1991-07-22 | 1997-09-11 | Switch mechanism |
| HK98109268A HK1008369A1 (en) | 1991-07-22 | 1998-07-20 | Switch mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ23907691A NZ239076A (en) | 1991-07-22 | 1991-07-22 | Twin fulcrum switch mechanism for residual current circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ239076A true NZ239076A (en) | 1996-07-26 |
Family
ID=19923668
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ23907691A NZ239076A (en) | 1991-07-22 | 1991-07-22 | Twin fulcrum switch mechanism for residual current circuit breaker |
| NZ280909A NZ280909A (en) | 1991-07-22 | 1996-01-30 | Shunt trip release switch for residual current device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ280909A NZ280909A (en) | 1991-07-22 | 1996-01-30 | Shunt trip release switch for residual current device |
Country Status (1)
| Country | Link |
|---|---|
| NZ (2) | NZ239076A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7907371B2 (en) | 1998-08-24 | 2011-03-15 | Leviton Manufacturing Company, Inc. | Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture |
-
1991
- 1991-07-22 NZ NZ23907691A patent/NZ239076A/en unknown
-
1996
- 1996-01-30 NZ NZ280909A patent/NZ280909A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7907371B2 (en) | 1998-08-24 | 2011-03-15 | Leviton Manufacturing Company, Inc. | Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture |
| US8054595B2 (en) | 1998-08-24 | 2011-11-08 | Leviton Manufacturing Co., Inc. | Circuit interrupting device with reset lockout |
| US8130480B2 (en) | 1998-08-24 | 2012-03-06 | Leviton Manufactuing Co., Inc. | Circuit interrupting device with reset lockout |
Also Published As
| Publication number | Publication date |
|---|---|
| NZ280909A (en) | 1996-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0526071B1 (en) | Switch mechanism | |
| US5517165A (en) | Switch mechanism | |
| US7177126B2 (en) | ALCI with reset lockout and independent trip | |
| US8054595B2 (en) | Circuit interrupting device with reset lockout | |
| AU635888B2 (en) | Earth leakage trip indicator | |
| US7554781B1 (en) | Protective device with an auxiliary switch | |
| US4223288A (en) | Manually operable and shunt controllable circuit breaker | |
| AU772359B2 (en) | Ground fault current interrupter/arc fault current interrupter circuit breaker with fail safe mechanism | |
| JPH0765688A (en) | Contactor / protective relay type protection switch | |
| AU639986B2 (en) | A circuit breaker | |
| US6324043B1 (en) | Residual current detector with fail safe lockout device | |
| US5862029A (en) | Resettable immersion detecting circuit interrupter (IDCI) | |
| US20100175970A1 (en) | Residual current circuit breaker controlling and auxiliary apparatus, and residual current circuit breaker equipped thereby | |
| EP2136383B1 (en) | A control device for an automatic reset apparatus | |
| US6833777B2 (en) | Switching method for an electromagnetic switching device and an electromagnetic switching device corresponding thereto | |
| WO2002080329A1 (en) | A compact circuit interuption device | |
| NZ239076A (en) | Twin fulcrum switch mechanism for residual current circuit breaker | |
| EP1495477B1 (en) | Circuit breaker having fault-current cutoff | |
| NZ280910A (en) | Residual current device switch mechanism; welded contacts separable by force applied to manual reset button | |
| JP2002521801A (en) | Short circuit protection device | |
| JP2000003661A (en) | Earth leakage breaker | |
| CA2317881A1 (en) | Residual current detector with fail safe lockout device | |
| DE19842469A1 (en) | Safety cut-out device | |
| EP1261005A1 (en) | Mechanism for an enclosed residual current-operated circuit breaker | |
| MXPA01001973A (en) | Circuit interrupting system with independent trip and reset lockout |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RENW | Renewal (renewal fees accepted) | ||
| RENW | Renewal (renewal fees accepted) |