FR2391539A1 - PTC current limiting resistance - is encapsulated in heat conducting material whose density varies in response to external forces - Google Patents

PTC current limiting resistance - is encapsulated in heat conducting material whose density varies in response to external forces

Info

Publication number
FR2391539A1
FR2391539A1 FR7814589A FR7814589A FR2391539A1 FR 2391539 A1 FR2391539 A1 FR 2391539A1 FR 7814589 A FR7814589 A FR 7814589A FR 7814589 A FR7814589 A FR 7814589A FR 2391539 A1 FR2391539 A1 FR 2391539A1
Authority
FR
France
Prior art keywords
resistance
response
encapsulated
heat conducting
conducting material
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Withdrawn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
FR7814589A
Other languages
French (fr)
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.)
TRANSMICRO SCANDINAVIA AB
Original Assignee
TRANSMICRO SCANDINAVIA AB
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 TRANSMICRO SCANDINAVIA AB filed Critical TRANSMICRO SCANDINAVIA AB
Publication of FR2391539A1 publication Critical patent/FR2391539A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H01C7/022—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 mainly consisting of non-metallic substances

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Thermistors And Varistors (AREA)
  • Details Of Resistors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The positive temperature coefficient resistance is designed to be used as a current limiter in an electrical circuit. The resistance is enclosed in a prefabricated element whose total mass has been increased above the physical mass of the body of the resistance. The increase in mass is achieved by covering the body of the resistance with a material. The material has a density which varies in response to exterior forces, and is a conduction of heat. The material provides an increased thermal inertia for the resistance which eliminates the need to make over-dimensioned resistors for certain applications. The material improves heat dissipation from the parts of the resistor body where connection wires are soldered to the body. Thus local mechanical fatigue at these points is reduced.
FR7814589A 1977-05-17 1978-05-17 PTC current limiting resistance - is encapsulated in heat conducting material whose density varies in response to external forces Withdrawn FR2391539A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7705838A SE413727B (en) 1977-05-17 1977-05-17 FOR USE AS A CURRENT LIMIT COMPONENT IN AN ELECTRIC CIRCUIT PROVIDED PCT RESIST

Publications (1)

Publication Number Publication Date
FR2391539A1 true FR2391539A1 (en) 1978-12-15

Family

ID=20331376

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7814589A Withdrawn FR2391539A1 (en) 1977-05-17 1978-05-17 PTC current limiting resistance - is encapsulated in heat conducting material whose density varies in response to external forces

Country Status (9)

Country Link
BE (1) BE867156A (en)
DE (1) DE2821402A1 (en)
DK (1) DK216478A (en)
FI (1) FI781571A (en)
FR (1) FR2391539A1 (en)
IT (1) IT1095894B (en)
NL (1) NL7805256A (en)
NO (1) NO781730L (en)
SE (1) SE413727B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015816C2 (en) * 1990-05-17 1994-05-26 Reinshagen Kabelwerk Gmbh cableset
DE4101209A1 (en) * 1991-01-17 1992-07-23 Pilz Gmbh & Co SAFETY SWITCHGEAR
DE19606597A1 (en) * 1996-02-22 1997-08-28 Abb Patent Gmbh Medium or low voltage switchgear
DE19808025A1 (en) * 1998-02-26 1999-09-02 Abb Research Ltd Method for producing a PTC thermistor arrangement and use of the PTC thermistor arrangement as a current limiter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE665388A (en) * 1964-07-09 1965-10-01
GB1335785A (en) * 1972-07-25 1973-10-31 Standard Telephones Cables Ltd Thermistor assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE665388A (en) * 1964-07-09 1965-10-01
GB1335785A (en) * 1972-07-25 1973-10-31 Standard Telephones Cables Ltd Thermistor assembly

Also Published As

Publication number Publication date
DK216478A (en) 1978-11-18
IT7823488A0 (en) 1978-05-17
BE867156A (en) 1978-11-17
IT1095894B (en) 1985-08-17
SE7705838L (en) 1978-11-18
DE2821402A1 (en) 1978-11-30
NL7805256A (en) 1978-11-21
FI781571A (en) 1978-11-18
SE413727B (en) 1980-06-16
NO781730L (en) 1978-11-20

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Legal Events

Date Code Title Description
ST Notification of lapse