GB1423510A - Overload protection devices - Google Patents

Overload protection devices

Info

Publication number
GB1423510A
GB1423510A GB1169572A GB1169572A GB1423510A GB 1423510 A GB1423510 A GB 1423510A GB 1169572 A GB1169572 A GB 1169572A GB 1169572 A GB1169572 A GB 1169572A GB 1423510 A GB1423510 A GB 1423510A
Authority
GB
United Kingdom
Prior art keywords
current
transistor
signal
circuit
march
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.)
Expired
Application number
GB1169572A
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.)
Delta Controls Ltd
Original Assignee
Delta Controls Ltd
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 Delta Controls Ltd filed Critical Delta Controls Ltd
Priority to GB1169572A priority Critical patent/GB1423510A/en
Publication of GB1423510A publication Critical patent/GB1423510A/en
Expired 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
    • H02H3/087—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 for dc applications
    • 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
    • H02H3/02—Details
    • H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection

Abstract

1423510 Arc limiting DELTA CONTROLS Ltd 1 March 1973 [13 March 1972] 11695/72 Heading H1N [Also in Division H2] An overload protective device comprises current sensing means 10, 14 providing a signal when the load current exceeds a predetermined value, semi-conductor current limiting means 8 to limit the load current in response to the signal and an electromagnetic relay arrangement to break the circuit in response to the signal. As shown, when the current through a resistor 10 exceeds the predetermined value, an amplifier 14 provides the signal to the bases of transistors 18, 23. These transistors now conduct, the transistor 18 causing the current limiting transistor 8 to limit the current and the transistor 23 energising the coil 6 of a relay which opens contacts 4 in the load circuit and opens contacts 26 to hold the transistor 23 on by a bias due to resistors 28, 30, so that the relay coil remains energised. The amplifier 14 has a positive feed-back circuit 16.
GB1169572A 1972-03-13 1972-03-13 Overload protection devices Expired GB1423510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1169572A GB1423510A (en) 1972-03-13 1972-03-13 Overload protection devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1169572A GB1423510A (en) 1972-03-13 1972-03-13 Overload protection devices

Publications (1)

Publication Number Publication Date
GB1423510A true GB1423510A (en) 1976-02-04

Family

ID=9991015

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1169572A Expired GB1423510A (en) 1972-03-13 1972-03-13 Overload protection devices

Country Status (1)

Country Link
GB (1) GB1423510A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207308A (en) * 1987-07-17 1989-01-25 Telemecanique Electrique Overcurrent protection circuit
US9998117B2 (en) 2015-12-10 2018-06-12 Abb Schweiz Ag Solid state resettable fuses

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207308A (en) * 1987-07-17 1989-01-25 Telemecanique Electrique Overcurrent protection circuit
DE3824116A1 (en) * 1987-07-17 1989-01-26 Telemecanique Electrique CIRCUIT AND DEVICE FOR PROTECTED SUPPLY OF A LOAD WITH THE AID OF ELECTRONIC AND ELECTROMECHANICAL INTERRUPTORS
GB2207308B (en) * 1987-07-17 1991-08-07 Telemecanique Electrique A circuit and apparatus for the protected supply of a load by means of static and electromechanical switches
US9998117B2 (en) 2015-12-10 2018-06-12 Abb Schweiz Ag Solid state resettable fuses

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees