GB2204198A - Socket with residual current circuit breaker and test facility - Google Patents
Socket with residual current circuit breaker and test facility Download PDFInfo
- Publication number
- GB2204198A GB2204198A GB08805595A GB8805595A GB2204198A GB 2204198 A GB2204198 A GB 2204198A GB 08805595 A GB08805595 A GB 08805595A GB 8805595 A GB8805595 A GB 8805595A GB 2204198 A GB2204198 A GB 2204198A
- Authority
- GB
- United Kingdom
- Prior art keywords
- socket
- interlock
- electrical
- circuit
- contacts
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/334—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control
- H02H3/335—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control the main function being self testing of the device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
- H01R13/7135—Structural association with built-in electrical component with built-in switch the switch being a safety switch with ground fault protector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/001—Means for preventing or breaking contact-welding
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A mains supply socket or adaptor having apertures T1, T2 for receiving the pins of an electrical plug, and an interlock member 20 displaceable from one position to another position in response to the insertion of the plug, further comprises a residual current circuit breaker RC1 including means for establishing an outgoing supply, and a first electrical contact engagable with a second electrical contact to form an electrical interlock inhibiting the means for establishing the outgoing supply whenever the interlock member 20 is not at a first b of its two positions a, b. The interlock test forms part of a test sequence which is followed before the supply is established. A simulated fault can be applied at a test winding 12. <IMAGE>
Description
-2 2 OP 11 RESIDUAL CURRENT CIRCUIT BREAKERS In a residual current circuit
breaker (RCCB or RCD) where the outgoing supply is broken or isolated by tripping a circuit breaking device, it is preferable that the outgoing supply is established i.e. the circuit breaking device is set to its non-tripped state, prior to the connection of the outgoing load. This is usually achieved by a mechanical interlock physically preventing the outgoing supply being established after electrical contact has been made with the pins of the plug of the appliance(s) to be protected.
According to the present invention there is provided a mains supply socket having apertures for receiving the pins of an electrical plug and an interlock member displaceable from one position to another position in response to the insertion of a plug, the socket further comprising a residual current circuit breaker including means for establishing an outgoing supply, and a first electrical contact engageable with a second electrical contact to form an electrical interlock inhibiting the means for establishing the outgoing supply whenever the interlock member is not at a first of its two positions.
In particular the electrical interlock may indicate whether or not the socket is/is not vacant such that the outgoing supply is established only if the socket is vacant. The two electrical contacts preferably form a switching device which is actuated by the interlock member from a first state to a second state in response to the insertion of a plug into the socket. The interlock member preferably comprises a shutter mechanism normally protecting the socket.
2 Where a mechanical circuit breaking device is used, one of the two electrical contacts is preferably carried on and/or actuated by a movable contact of the breaking device. The test circuit may then also check the position of the contact(.5) of the breaking device to detect contact stick/weld situations as well as the successful making and/or tripping of the circuit breaking contacts.
In a preferred embodiment, the position of a first of the contacts is responsive to the position of the socket shutter mechanism and the position of the second contact is dependent on the position of a movable contact of the circuit breaking device. The two contacts may then engage one another only when the socket is vacant and the movable circuit breaker contact is at its relaxed (tripped) position. Alternative combinations of socket occupancy/ vacancy and circuit breaker contact(s) position may also be detected by suitably rearranging and/or supplementing the mechanical situation in which these contacts are connected together.
The ele6trical interlock circuit may form part of the test circuit described in our copending application being filed concurrently herewith to provide a comprehensive test sequence for a RCD.
By way of an example only, an embodiment of the invention will now be described with reference to the accompanying drawing in which the sole figure is a schematic circuit diagram of a RCD circuit.
The illustrated circuit may be housed within an adaptor which is plugged into a mains socket, the circuit having outgoing supply terminals Tl, T2 connected to an outgoing 3 supply socket in the adaptor housing for receiving a plug connected to the appliance being protected.
Alternatively, the illustrated circuit might be included within the housing of the mains socket itself. In this case an on/off power switch would be included.
The circuit includes a conventional fault sensing mechanism comprising a toroid 10 with a sensing coil which senses a difference in the currents flowing in the live and neutral conductors of the power line and a detector 11 for detecting an imbalance in the sensed currents. In addition, however, a third conductor 12 passes through the toroid to provide a simulated fault signal to the detector when a transistor TR1 is pulsed "on" by an output from the test sequencer S1.
An output from the detector 11 sets a latch Tl to trip a relay drive transistor TR2 driving a relay Rl. In operation the transistor TR2 is normally biased "on" so that the relay Rl is energised and the relay contacts RC1 are pulled in. The relay contacts RC1 form the circuit breaking device so that, when the latch Tl is set in response to an output from the detector 11, the relay is de-energised (tripped) and the contacts RC1 open to isolate the outgoing supply terminals T1, T2.
An auto-test circuit is provided to check the operation of the toroid 10, detector 11, trip latch T1, drive transistor TR2 and relay RI before enabling the output at terminal Tl and T2 for finally supplying power to the appliance to be protected. The sequence starts in response to a power "on" signal. It provides a first sequence of signals in which the latch Tl is isolated from the tripping circuit by disabling the output gate G1, and a second sequence of signals in which the gate G1 4 is enabled, thereby including relay Rl in the test sequence.
An electrical interlock is included in the test circuit to provide a check for socket vacancy and the position of the relay contacts at different times in the test sequence. These checks are performed by detecting electrical contact between the moving contact RC1 of the relay Rl and a floating back contact 20 fixed on a shutter mechanism associated with the outgoing supply socket. The electrical contact completes a circuit 17 through a correlator Cl to a fault latch Fl. This circuit 17 is only made when the relay contacts are at the relaxed or "outgoing supply interrupted" position "c", and the contact 20 located on the shutter mechanism is at the position "b" indicating that the socket is vacant. When a plug is engaged in the socket, the contact 20 is moved out of the "b" position to the "a" position and is no longer able to complete the electrical circuit 17 to the correlator. Additionally, if the relay contacts are not at the relaxed position "c", the electrical circuit 17 is also opened.
Initially the fault latch Fl is cleared (reset). Each check for continuity of line 17 is then performed at the appropriate time in the test sequence by a pulse from the sequencer S1 enabling a gate in the correlator Cl so that the input 17 is enabled on to the fault latch Fl via line 23. If the socket is vacant and the relay Rl is in its relaxed state, the input to the fault latch has no effect. If however the socket is not vacant and/or the relay is not relaxed, the fault latch is set via line 17 by the mains related voltage on power line L.
In the first test sequence the correlator Cl initially checks for continuity of circuit 17 to ensure that the contacts RC1 are not sticking or welded to one another and the outgoing socket is vacant. A check is also made via signal line 18 to verify the non-conducting status of the relay control transistor TR2.
As well as checking for continuity of line 17, the correlator Cl also consists of set/reset latches and co operates with the sequencer S1 so that when a test is initiated by a pulse from the sequencer at a first count and this sets a latch in the correlator, the consequence of the test should reset the latch at the next count if the result is valid. If the latch is not reset, the fault latch Fl, responsive to the absence of the correct correlation at the next count, is set to disable the gate G1 to prevent the relay R1 subsequently enabling the outgoing supply.
The first test sequence continues by resetting the trip latch Tl, with the gate Gl disabled. A trip signal is next introduced via test transistor TR1 and the correlator checks the trip is detected at the trip latch T1 output.
At the end of the first sequence the correlator again checks for a signal at input 17 corresponding to continued socket vacancy and the relay being at the rest position. The sequencer S1 next resets the trip latch T1 and enables the output gate G1 which in turn drives the relay contacts RC1 closed via transistor TR2. The correlator then checks the relay contacts RC1 have pulled in by checking that the circuit 17 has been interrupted due to the relay contacts moving from position "c" to position "d".
6 At the beginning of the second sequence, the sequencer Sl again injects a pulse to the test transistor TRl to provide a simulated fault signal, and the sequence continues by correlating the response of the circuit wit' this fault signal. In particular the correlator checks the trip latch Tl has been set, the relay control transistor TR2 is turned off, and the relay contacts RCl have returned to the tripped position "c" re-establishing the electrical circuit 17. The correlation and/or checking at each stage of the sequence is achieved in the same manner as in the previous tests.
The second sequence terminates after the correlator again checks for socket vacancy and tripped relay contact status via correlator input 17 with the sequencer Sl then resetting the trip latch Tl and enabling the output gate Gl which in turn drives the relay contacts RCl closed via transistor TR2. Again the correlator checks the relay contacts RCl have pulled in via the socket vacancy/tripped relay contact status input 17.
At the end of the two stage test sequence, indicator control logic 21 is also enabled which, provided the sequences have been completed without a fault being detected, drives an LED 22 to indicate completion of the auto test sequence. The trip signal is also fed to the indicator logic 21 so that a genuine trip causes the indicator to flash.
Completion of the dual test sequence also enables a pulse generator PG1 and corresponding logic in the co.rrelator to provide a continual test system.
In this case the pulse generator feeds short clock pulses to disable the gate Gl and turn the relay control 7 transistor TR1 off momentarily. The pulse period is such that the decay of relay current may be detected at the relay control transistor TR2 via signal line 18, but is insufficient to actually cause movement of the relay contacts RC1. The output or return pulse on line 18 is correlated with the short clock pulse signals from the pulse generator PG1 such that a latch is set in the correlator by the leading edge of the clock pulse and then reset by the leadi.ng edge of the pulse returned on line 18. If line 18 does not change state prior to the trailing edge of the clock pulse being detected, the fault latch Fl is set, the relay Rl disabled and the indicator extinguished.
In a preferred method of generating the simulated fa'ult signal, alternate half-wave pulses from a bridge rectifier in the power supply for the RCD are applied to the third conductor 12 through the toroid 10 by connecting the transistor TR1 between a diode D1 and the Ov line of the bridge rectifier, the other side of the diode being connected to the neutral conductor (N) of the power line via the third conductor 12.
8 - R
Claims (15)
1. A mains supply socket having apertures for receiving the pins of an electrical plug and an interlock member displaceable from one position to another position in response to the insertion of a plug, the socket further comprising a residual current circuit breaker including means for establishing an outgoing supply, and a first electrical contact engageable with a second electrical contact to form an electrical interlock inhibiting the means for establishing the outgoing supply whenever the interlock member is not at a first of its two positions.
2. A socket according to claim 1 in which the two contacts are engageable with one another to form the electrical interlock only when the socket is vacant.
3. A socket according to claim 1 or claim 2 wherein one of the two contacts comprises a movable contact of a circuit breaking device for isolating the outgoing supply.
4. A socket according to any one of the preceding claims in which one of the two contacts comprises a floating contact movable with the interlock member.
5. A socket according to any one of the preceding claims in which the electrical interlock influences a sequence of tests for assessing the protective ability of the RCD.
6. A socket according to claim 5 in which a test circuit is used to implement the sequence of tests.
9
7. A socket according to claim 6 in which the test circuit includes means for tripping a circuit breaking device in response to a simulated fault signal in the sequence of tests, and in which presence of the electrical interlock inhibits the circuit breaking device from being initially set into a conductive state.
8. A socket according to any one of the claims 5-7 in which the presence of the electrical interlock interrupts or modifies the test sequence to prevent the outgoing supply being enabled onto the pins of the plug during and/or after insertion of a plug into the socket.
9. A socket according to claim 7 in which the test circuit includes means for correlating the response of the circuit breaking device and/or tripping means to an applied test signal, the correlating means detecting the presence of the electrical interlock to interrupt the test sequence.
10. A socket according to any one of the preceding claims in which the electrical interlock is used to detect when the contacts of a circuit breaking device are in a relaxed or tripped position.
11. A socket according to any one of the claims 1-9 in which the electrical interlock is used to detect when the contacts of a circuit breaking device are in the made or conductive position.
12. A residual current circuit breaker (RCD) having an associated outgoing supply socket, the RCD including a test circuit with an electrical/electronic interlock mechanism providing an indication of whether or not the socket is or is not vacant, and means for enabling the outgoing supply only if the socket is vacant.
13. A circuit according to claim 12 in which the interlock mechanism includes a switching device which is actuated from a first state to a second state in response to the insertion of a plug into the socket.
14. A circuit according to claim 13 in which the switching device includes a pair of contacts, the position of a first of the contacts being responsive to the position of an interlock member for actuating the switching device during insertion of a plug, and the position of the second contact being dependent on the position of a movable contact of the circuit breaking device of the RCD.
15. A mains supply socket including a residual current circuit breaker substantially as herein described with reference to the accompanying drawing.
Published 1988 at The Patent office, state House, 65171 High Holborn, London WC IR 4TP. Further copies maybe obtained from The Patent O:MCe, sales Branch, St Mary Cray, Orpington, Rent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Xent- Con- 1/87.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB878705438A GB8705438D0 (en) | 1987-03-09 | 1987-03-09 | Residual current circuit breakers |
| GB878705437A GB8705437D0 (en) | 1987-03-09 | 1987-03-09 | Residual current circuit breakers |
| GB878722867A GB8722867D0 (en) | 1987-03-09 | 1987-09-29 | Residual current circuit breakers |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8805595D0 GB8805595D0 (en) | 1988-04-07 |
| GB2204198A true GB2204198A (en) | 1988-11-02 |
| GB2204198B GB2204198B (en) | 1991-04-24 |
Family
ID=27263341
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8805595A Expired - Fee Related GB2204198B (en) | 1987-03-09 | 1988-03-09 | Residual current circuit breakers |
| GB08805593A Withdrawn GB2203907A (en) | 1987-03-09 | 1988-03-09 | Testing residual current circuit breakers |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08805593A Withdrawn GB2203907A (en) | 1987-03-09 | 1988-03-09 | Testing residual current circuit breakers |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB2204198B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0446933A2 (en) * | 1990-03-15 | 1991-09-18 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker |
| DE4106652A1 (en) * | 1991-03-02 | 1992-09-10 | Abb Patent Gmbh | Fault current protection switch |
| US5459444A (en) * | 1991-05-16 | 1995-10-17 | Felchar Manufacturing Corporation | Circuit breaker for use in wall mounted plug |
| GB2292491A (en) * | 1994-08-16 | 1996-02-21 | Crabtree Electrical Ind Ltd | Residual current device with reset switch and test circuit |
| EP0945930A1 (en) * | 1998-03-27 | 1999-09-29 | Compliance Technology Limited | Electrical risk monitoring device |
| WO2016105486A1 (en) | 2014-12-23 | 2016-06-30 | Cooper Technologies Company | Testing and monitoring of an electrical connection |
| DE102018101639A1 (en) * | 2018-01-25 | 2019-07-25 | Eaton Intelligent Power Limited | Test signaling device and attachment for a protective switching device |
| US10520529B2 (en) | 2016-03-23 | 2019-12-31 | Cooper Technologies Company | Adapters for testing electrical equipment |
| US10704827B2 (en) | 2015-12-28 | 2020-07-07 | Eaton Intelligent Power Limited | Systems and methods for testing electrical connectors |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5177657A (en) * | 1991-05-16 | 1993-01-05 | Felchar Manufacturing Corporation | Ground fault interruptor circuit with electronic latch |
| US5309310A (en) * | 1992-01-21 | 1994-05-03 | Felchar Manufacturing Corporation | Combined ground fault interrupter circuit and remote control on/off device |
| DE4205208A1 (en) * | 1992-02-20 | 1993-08-26 | Siemens Ag | Fault current protection switch |
| DE4340737A1 (en) * | 1993-11-30 | 1995-06-01 | Kopp Heinrich Ag | Residual current circuit breaker |
| NZ314155A (en) * | 1997-01-30 | 1999-07-29 | Fisher & Paykel | Dishwasher detergent dispenser located in door recess, having open top and being flushed out by overhead nozzle |
| GB0226111D0 (en) | 2002-11-08 | 2002-12-18 | Delta Electrical Ltd | Residual current devices |
| MXPA06002971A (en) * | 2004-04-19 | 2006-05-31 | Trinity S A | Method and safety device for ground fault protection circuit. |
| EP1591797A1 (en) * | 2004-04-28 | 2005-11-02 | Megger Limited | Circuit breakers test device |
| DE102006053397A1 (en) | 2006-11-10 | 2008-05-15 | Cedes Ag | Safety switching device |
| RU2478246C2 (en) * | 2011-05-16 | 2013-03-27 | Общество с ограниченной ответственностью "ЭнергоТест" (ООО "ЭнергоТест") | Protection device of electric appliances against increased and decreased voltage in ac mains and impact of phase voltage on zero conductor |
| DE102012220692B4 (en) * | 2012-11-13 | 2019-05-29 | Bender Gmbh & Co. Kg | Method and device for monitoring a test interval for a residual current device |
| GB2533365B (en) * | 2014-12-18 | 2017-02-08 | Shakira Ltd | Residual Current Devices |
| CN104575203A (en) * | 2015-01-06 | 2015-04-29 | 国家电网公司 | Three-level residual current operated protection simulated practice training system |
| EP4050349A1 (en) * | 2021-02-25 | 2022-08-31 | ABB Schweiz AG | A residual current device for low voltage electric lines |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4002951A (en) * | 1975-09-22 | 1977-01-11 | Cutler-Hammer, Inc. | Electrical receptacle mounted ground fault interrupter with automatic plug insertion testing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3786356A (en) * | 1972-06-30 | 1974-01-15 | Federal Pacific Electric Co | Ground fault detector |
| US3787708A (en) * | 1973-01-02 | 1974-01-22 | Gen Electric | Monitor system for ground fault relay |
| US4031431A (en) * | 1975-10-01 | 1977-06-21 | The Gillette Company | Ground fault circuit interrupter |
| GB1585826A (en) * | 1978-05-15 | 1981-03-11 | B & R Relays Ltd | Circuit breakers |
| US4351013A (en) * | 1980-04-15 | 1982-09-21 | Westinghouse Electric Corp. | Circuit interrupter with multiple display and parameter entry means |
-
1988
- 1988-03-09 GB GB8805595A patent/GB2204198B/en not_active Expired - Fee Related
- 1988-03-09 GB GB08805593A patent/GB2203907A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4002951A (en) * | 1975-09-22 | 1977-01-11 | Cutler-Hammer, Inc. | Electrical receptacle mounted ground fault interrupter with automatic plug insertion testing |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5650907A (en) * | 1990-03-15 | 1997-07-22 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker |
| EP0446933A3 (en) * | 1990-03-15 | 1992-09-16 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker |
| EP0446933A2 (en) * | 1990-03-15 | 1991-09-18 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker |
| DE4106652A1 (en) * | 1991-03-02 | 1992-09-10 | Abb Patent Gmbh | Fault current protection switch |
| US5459444A (en) * | 1991-05-16 | 1995-10-17 | Felchar Manufacturing Corporation | Circuit breaker for use in wall mounted plug |
| GB2292491B (en) * | 1994-08-16 | 1998-12-30 | Crabtree Electrical Ind Ltd | Electric switches |
| GB2292491A (en) * | 1994-08-16 | 1996-02-21 | Crabtree Electrical Ind Ltd | Residual current device with reset switch and test circuit |
| EP0945930A1 (en) * | 1998-03-27 | 1999-09-29 | Compliance Technology Limited | Electrical risk monitoring device |
| WO2016105486A1 (en) | 2014-12-23 | 2016-06-30 | Cooper Technologies Company | Testing and monitoring of an electrical connection |
| EP3237916A4 (en) * | 2014-12-23 | 2019-03-06 | Cooper Technologies Company | Testing and monitoring of an electrical connection |
| US10374369B2 (en) | 2014-12-23 | 2019-08-06 | Eaton Intelligent Power Limited | Testing and monitoring of an electrical connection |
| US10704827B2 (en) | 2015-12-28 | 2020-07-07 | Eaton Intelligent Power Limited | Systems and methods for testing electrical connectors |
| US10520529B2 (en) | 2016-03-23 | 2019-12-31 | Cooper Technologies Company | Adapters for testing electrical equipment |
| DE102018101639A1 (en) * | 2018-01-25 | 2019-07-25 | Eaton Intelligent Power Limited | Test signaling device and attachment for a protective switching device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2204198B (en) | 1991-04-24 |
| GB8805595D0 (en) | 1988-04-07 |
| GB2203907A (en) | 1988-10-26 |
| GB8805593D0 (en) | 1988-04-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960309 |