SE9102895L - DEVICE FOR OVERLOAD AND SHORT-CUT PROTECTION IN ELECTRICAL EQUIPMENT - Google Patents

DEVICE FOR OVERLOAD AND SHORT-CUT PROTECTION IN ELECTRICAL EQUIPMENT

Info

Publication number
SE9102895L
SE9102895L SE9102895A SE9102895A SE9102895L SE 9102895 L SE9102895 L SE 9102895L SE 9102895 A SE9102895 A SE 9102895A SE 9102895 A SE9102895 A SE 9102895A SE 9102895 L SE9102895 L SE 9102895L
Authority
SE
Sweden
Prior art keywords
thermistor
polymer composition
short
parallel
overload
Prior art date
Application number
SE9102895A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9102895D0 (en
SE469250B (en
Inventor
T Hansson
Original Assignee
Asea Brown Boveri
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 Asea Brown Boveri filed Critical Asea Brown Boveri
Priority to SE9102895A priority Critical patent/SE469250B/en
Publication of SE9102895D0 publication Critical patent/SE9102895D0/en
Priority to JP5506842A priority patent/JPH06511617A/en
Priority to PCT/SE1992/000696 priority patent/WO1993007667A1/en
Priority to EP92921495A priority patent/EP0607269A1/en
Publication of SE9102895L publication Critical patent/SE9102895L/en
Publication of SE469250B publication Critical patent/SE469250B/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/026—Current limitation using PTC resistors, i.e. resistors with a large positive temperature coefficient
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
    • H01C7/027—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material

Abstract

A device for overload and short-circuit protection in low-voltage plants includes a circuit breaker (1, 2, 3) which is connected in series with a current limiter (4, 5) which comprises two parallel-connected current branches. One of the branches comprises a thermistor (4) with a positive temperature coefficient, whereas the other branch comprises an impedance (5) for current and voltage relief of the thermistor. The thermistor (4) comprises at least one body (10), provided with two parallel surfaces, of an electrically conductive polymer composition and two electrodes. At least one of the parallel surfaces on the body or one of the bodies of polymer composition is adapted to make free contact with an electrode (11) or with a parallel surface on another body of electrically conductive polymer composition. A pressure device is adapted to exert on the electrodes a pressure directed perpendicular to the parallel surfaces on the body, or the bodies, of polymer composition. The pressure device is preferably provided with pressure-exerting devices (15, 16, 17, 17a, 17b) with the ability to be resilient. After changing from a low resistance to a high resistance state, the thermistor returns to the initial resistance and is reusable after having been subjected to short-circuit currents.
SE9102895A 1991-10-07 1991-10-07 DEVICE FOR OVERLOAD AND SHORT-CUT PROTECTION IN ELECTRICAL EQUIPMENT SE469250B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9102895A SE469250B (en) 1991-10-07 1991-10-07 DEVICE FOR OVERLOAD AND SHORT-CUT PROTECTION IN ELECTRICAL EQUIPMENT
JP5506842A JPH06511617A (en) 1991-10-07 1992-10-05 Overload and short circuit protection devices for electrical equipment
PCT/SE1992/000696 WO1993007667A1 (en) 1991-10-07 1992-10-05 Device for overload and short-circuit protection in electric plants
EP92921495A EP0607269A1 (en) 1991-10-07 1992-10-05 Device for overload and short-circuit protection in electric plants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9102895A SE469250B (en) 1991-10-07 1991-10-07 DEVICE FOR OVERLOAD AND SHORT-CUT PROTECTION IN ELECTRICAL EQUIPMENT

Publications (3)

Publication Number Publication Date
SE9102895D0 SE9102895D0 (en) 1991-10-07
SE9102895L true SE9102895L (en) 1993-04-08
SE469250B SE469250B (en) 1993-06-07

Family

ID=20383921

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9102895A SE469250B (en) 1991-10-07 1991-10-07 DEVICE FOR OVERLOAD AND SHORT-CUT PROTECTION IN ELECTRICAL EQUIPMENT

Country Status (4)

Country Link
EP (1) EP0607269A1 (en)
JP (1) JPH06511617A (en)
SE (1) SE469250B (en)
WO (1) WO1993007667A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340632A1 (en) * 1993-11-30 1995-06-01 Abb Patent Gmbh Electrical switching device
DE4441280C2 (en) * 1994-11-19 1998-08-27 Asea Brown Boveri PTC thermistor and device for current limitation with at least one PTC thermistor
SE515262C2 (en) * 1995-02-16 2001-07-09 Abb Research Ltd Device for current limiting and protection against short-circuit currents in an electrical system
JPH0955266A (en) * 1995-08-11 1997-02-25 Maspro Denkoh Corp Branch device
FR2738681B1 (en) * 1995-09-12 1997-10-17 Gec Alsthom T & D Sa POLYMER CURRENT LIMITER
US5666254A (en) * 1995-09-14 1997-09-09 Raychem Corporation Voltage sensing overcurrent protection circuit
US5737160A (en) * 1995-09-14 1998-04-07 Raychem Corporation Electrical switches comprising arrangement of mechanical switches and PCT device
US5864458A (en) * 1995-09-14 1999-01-26 Raychem Corporation Overcurrent protection circuits comprising combinations of PTC devices and switches
US5689395A (en) * 1995-09-14 1997-11-18 Raychem Corporation Overcurrent protection circuit
FR2772524B1 (en) * 1997-12-12 2000-05-12 Legrand Sa PROTECTION DEVICE AGAINST OVERCURRENTS, IN PARTICULAR FOR THE RESETTABLE PROTECTION OF A CONTROL SWITCH
FR3067870B1 (en) 2017-06-16 2021-01-01 Schneider Electric Ind Sas ELECTRICAL PROTECTION DEVICE INCLUDING A CURRENT LIMITING DEVICE
US10895609B2 (en) * 2019-05-09 2021-01-19 Littelfuse, Inc. Circuit protection device with PTC element and secondary fuse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4656555A (en) * 1984-12-14 1987-04-07 Harvey Hubbell Incorporated Filament wrapped electrical assemblies and method of making same
US4698614A (en) * 1986-04-04 1987-10-06 Emerson Electric Co. PTC thermal protector
SE462250B (en) * 1988-10-13 1990-05-21 Asea Brown Boveri DEVICE FOR OVERSEAS PROTECTION

Also Published As

Publication number Publication date
JPH06511617A (en) 1994-12-22
SE9102895D0 (en) 1991-10-07
EP0607269A1 (en) 1994-07-27
WO1993007667A1 (en) 1993-04-15
SE469250B (en) 1993-06-07

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