GB1392532A - Over-temperature fuses for electric windings - Google Patents

Over-temperature fuses for electric windings

Info

Publication number
GB1392532A
GB1392532A GB1975572A GB1975572A GB1392532A GB 1392532 A GB1392532 A GB 1392532A GB 1975572 A GB1975572 A GB 1975572A GB 1975572 A GB1975572 A GB 1975572A GB 1392532 A GB1392532 A GB 1392532A
Authority
GB
United Kingdom
Prior art keywords
alloy
fuse
flux
metal
eutectic
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
GB1975572A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1392532A publication Critical patent/GB1392532A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/06—Fusible members characterised by the fusible material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/406—Temperature sensor or protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H2037/768—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material characterised by the composition of the fusible material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Fuses (AREA)

Abstract

1392532 Fusible cut-outs ROBERT BOSCH GmbH 28 April 1972 [29 April 1971] 19755/72 Heading H2G An excess temperature fuse for electrical windings comprises a fuse element made of metal or an alloy of metals with a melting point between 70‹ C. and 250‹ C. and a flux in contact with the fuse element which expands or gives off gas when the metal melts, the fuse element being in good thermal contact with the windings to be protected. The metal or metal alloy and flux are chosen according to their melting temperatures and the desired cut off temperature. The melting temperature of the metal alloy can be adjusted, e.g. by mixing eutectic alloy with the fuse element and using a flux with a melting temperature greater or equal to that of the eutectic. When a metal eutectic alloy made from non- eutectic metals is used for the fuse element, a flux may also be used which has a melting temperature higher than that of the eutectic but within the softening range or over the upper limit of the softening range of the alloy used. Non-eutectic "surface alloys" may also be used for fuse elements. Examples of fluxes suitable for the fuse are urea, alietic acid and natural colophony with melting temperatures of 133‹ C., 173‹ C. and 110 to 130‹ C. respectively. Details of six compositions of various alloys used for fuse elements, their softening ranges, suitable fluxes and the flux melting points are given in the Specification. In one embodiment of the invention the element comprises a metal strip made from an alloy, of e.g. Bi, Pb and Sn in equal proportions by weight, which softens in the range 95‹ C. to 140‹ C. Wires are welded to the element and urea, melting temperature 133‹ C., is deposited on part of the surface of the element either directly or by placing a piece of urea enriched material on a surface portion of the element. The whole element is then sealed between two transparent synthetic sheets welded together around their perimeter. In a second embodiment of the invention the fuse element comprises a tube made from an alloy of 60% Sn and 40% Bi, proportions by weight, that softens in the range 138‹ C. to 170‹ C., that contains passages filled with alietic acid. Connecting wires are clamped to the ends of the passages. The tube is enclosed by a plastic insulating coating. In a third embodiment of the invention the fuse element is made from solid wire formed from an alloy of 50À5% Bi, 27À8% Pb, 12À4% Sn, and 9À3% Cd, preportions by weight that softens in the temperature ranges 158‹ C. to 163‹ C., the element being welded to connecting wires. Alietic acid flux surrounds the element and the whole is inserted in a heat resistant insulating tube, e.g. of polycarbonate. Alternatively the fuse elements of the above embodiments may be provided with a solid casing, e.g. by moulding or coating thermo or duroplastic synthetic materials around them.
GB1975572A 1971-04-29 1972-04-28 Over-temperature fuses for electric windings Expired GB1392532A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2121120A DE2121120C3 (en) 1971-04-29 1971-04-29 Overtemperature protection for an electrical winding

Publications (1)

Publication Number Publication Date
GB1392532A true GB1392532A (en) 1975-04-30

Family

ID=5806372

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1975572A Expired GB1392532A (en) 1971-04-29 1972-04-28 Over-temperature fuses for electric windings

Country Status (9)

Country Link
AT (1) AT324471B (en)
BE (1) BE782870A (en)
CH (1) CH540565A (en)
DD (1) DD98583A5 (en)
DE (1) DE2121120C3 (en)
FR (1) FR2134341B1 (en)
GB (1) GB1392532A (en)
NL (1) NL7205736A (en)
SE (1) SE370823B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095315B1 (en) * 1982-05-22 1987-03-25 Heat Trace Limited Heat sensitive circuit interrupter
JP4396787B2 (en) * 1998-06-11 2010-01-13 内橋エステック株式会社 Thin temperature fuse and method of manufacturing thin temperature fuse
FR2789514B1 (en) * 1999-02-08 2003-03-28 Schneider Electric Ind Sa FUSE, ESPECIALLY INTERNAL FUSE OF A POWER CAPACITOR, AND POWER CAPACITOR COMPRISING SAME

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3377448A (en) * 1966-08-22 1968-04-09 Littelfuse Inc Thermal responsive miniature fuse
CA868830A (en) * 1967-12-16 1971-04-20 A. Ibscher Rolf Ternary fusible alloy

Also Published As

Publication number Publication date
FR2134341B1 (en) 1975-10-03
BE782870A (en) 1972-09-01
NL7205736A (en) 1972-10-31
SE370823B (en) 1974-10-28
AT324471B (en) 1975-09-10
DE2121120B2 (en) 1973-04-26
CH540565A (en) 1973-08-15
DE2121120C3 (en) 1973-11-22
DD98583A5 (en) 1973-06-20
FR2134341A1 (en) 1972-12-08
DE2121120A1 (en) 1972-11-16

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Legal Events

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