GB2000400A - Overload protection circuit - Google Patents

Overload protection circuit

Info

Publication number
GB2000400A
GB2000400A GB7827608A GB7827608A GB2000400A GB 2000400 A GB2000400 A GB 2000400A GB 7827608 A GB7827608 A GB 7827608A GB 7827608 A GB7827608 A GB 7827608A GB 2000400 A GB2000400 A GB 2000400A
Authority
GB
United Kingdom
Prior art keywords
protection circuit
overload protection
time delay
circuit
level
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.)
Withdrawn
Application number
GB7827608A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB7827608A priority Critical patent/GB2000400A/en
Publication of GB2000400A publication Critical patent/GB2000400A/en
Withdrawn legal-status Critical Current

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
    • H02H3/08—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 excess current
    • H02H3/093—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 excess current with timing means

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

An overload protection circuit which trips (RL1, RL2) after a time delay when overcurrents above a first threshold level (DZ2) are detected is arranged to trip instantaneously (via DZ1) if the overcurrent exceeds a second, higher, level. The time delay may be provided by an RC circuit R4, C2 or by a thermistor. <IMAGE>
GB7827608A 1977-06-23 1978-06-22 Overload protection circuit Withdrawn GB2000400A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7827608A GB2000400A (en) 1977-06-23 1978-06-22 Overload protection circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2634777 1977-06-23
GB7827608A GB2000400A (en) 1977-06-23 1978-06-22 Overload protection circuit

Publications (1)

Publication Number Publication Date
GB2000400A true GB2000400A (en) 1979-01-04

Family

ID=26258212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7827608A Withdrawn GB2000400A (en) 1977-06-23 1978-06-22 Overload protection circuit

Country Status (1)

Country Link
GB (1) GB2000400A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311240A1 (en) * 1982-04-05 1983-10-13 Siemens-Allis, Inc., 30338 Atlanta, Ga. Monitoring apparatus with a switching device
FR2562732A1 (en) * 1984-04-09 1985-10-11 Merlin Gerin Current transformer for protecting the neutral of a four-pole protective electrical apparatus
EP1816720A2 (en) * 2006-02-06 2007-08-08 EATON Corporation Electrical switching apparatus, power distribution system, and method employing breakpoint trip

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB958775A (en) * 1959-06-11 1964-05-27 English Electric Co Ltd Improvements in and relating to electrical relay circuit arrangements
GB1069093A (en) * 1962-11-01 1967-05-17 Allis Chalmers Mfg Co Improved circuit breaker control system
GB1069626A (en) * 1962-12-07 1967-05-24 English Electric Co Ltd Improvements in electrical overload-protection systems
GB1176018A (en) * 1967-08-03 1970-01-01 English Electric Co Ltd Improvements in Definite-Time Relays.
GB1262828A (en) * 1969-05-31 1972-02-09 Siemens Ag An installation comprising a current converter comprising semiconductor rectifier elements and a monitoring arrangement for the current converter
GB1292142A (en) * 1968-10-07 1972-10-11 Westinghouse Electric Corp Fault protection devices

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB958775A (en) * 1959-06-11 1964-05-27 English Electric Co Ltd Improvements in and relating to electrical relay circuit arrangements
GB1069093A (en) * 1962-11-01 1967-05-17 Allis Chalmers Mfg Co Improved circuit breaker control system
GB1069626A (en) * 1962-12-07 1967-05-24 English Electric Co Ltd Improvements in electrical overload-protection systems
GB1176018A (en) * 1967-08-03 1970-01-01 English Electric Co Ltd Improvements in Definite-Time Relays.
GB1292142A (en) * 1968-10-07 1972-10-11 Westinghouse Electric Corp Fault protection devices
GB1262828A (en) * 1969-05-31 1972-02-09 Siemens Ag An installation comprising a current converter comprising semiconductor rectifier elements and a monitoring arrangement for the current converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311240A1 (en) * 1982-04-05 1983-10-13 Siemens-Allis, Inc., 30338 Atlanta, Ga. Monitoring apparatus with a switching device
FR2562732A1 (en) * 1984-04-09 1985-10-11 Merlin Gerin Current transformer for protecting the neutral of a four-pole protective electrical apparatus
EP1816720A2 (en) * 2006-02-06 2007-08-08 EATON Corporation Electrical switching apparatus, power distribution system, and method employing breakpoint trip
EP1816720A3 (en) * 2006-02-06 2012-12-19 Eaton Corporation Electrical switching apparatus, power distribution system, and method employing breakpoint trip

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)