[go: up one dir, main page]

GB609745A - Improvements in and relating to fuse switches - Google Patents

Improvements in and relating to fuse switches

Info

Publication number
GB609745A
GB609745A GB3416/46A GB341646A GB609745A GB 609745 A GB609745 A GB 609745A GB 3416/46 A GB3416/46 A GB 3416/46A GB 341646 A GB341646 A GB 341646A GB 609745 A GB609745 A GB 609745A
Authority
GB
United Kingdom
Prior art keywords
conductors
pairs
switch
separated
switches
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
GB3416/46A
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
Publication of GB609745A publication Critical patent/GB609745A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)

Abstract

609,745. Thermal switches. LINDHOLM. J. P. Feb. 4, 1946, No. 3416. Convention date, Oct. 21, 1944. [Class 38 (v)] A switch that opens a circuit in case of fire comprises conductors 2, 3 normally kept in contact by a fusible material such as solder S but which are forced apart by springs 6, 7 when the solder melts. Two pairs of conductors 2, 3 are mounted in the same casing, the fire alarm being given only when both pairs are separated. If one pair only become separated, a defect alarm is given. In order to indicate which switch has operated when a number of switches are included in the same circuit, each switch is provided with an indicating member which is displaced to give a visual indication when one or both pairs of conductors 2, 3 are separated. As shown in Fig. 2, the indicator consists of a ball 10 loosely supported on the horizontal portions of the conductors. When the latter become separated the ball falls and shows through an opening in the bottom of the casing.
GB3416/46A 1944-10-21 1946-02-04 Improvements in and relating to fuse switches Expired GB609745A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE609745X 1944-10-21

Publications (1)

Publication Number Publication Date
GB609745A true GB609745A (en) 1948-10-06

Family

ID=20313016

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3416/46A Expired GB609745A (en) 1944-10-21 1946-02-04 Improvements in and relating to fuse switches

Country Status (1)

Country Link
GB (1) GB609745A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791660A (en) * 1953-12-30 1957-05-07 Gen Electric Electrical fuse
US2921167A (en) * 1958-06-04 1960-01-12 Stevens Mfg Co Inc Fuse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791660A (en) * 1953-12-30 1957-05-07 Gen Electric Electrical fuse
US2921167A (en) * 1958-06-04 1960-01-12 Stevens Mfg Co Inc Fuse

Similar Documents

Publication Publication Date Title
GB856724A (en) Improvements in or relating to annunciators
FR871446A (en) Fuse circuit breaker with indicating and tripping device
US2236891A (en) Fire alarm system
US2448026A (en) Electrical detecting circuit and device for testing the same
GB609745A (en) Improvements in and relating to fuse switches
GB779282A (en) Self-resetting electrical network automatically responsive to a condition
GB1065338A (en) Fire detection circuit
GB1313065A (en) Fused circuit elements
US2373819A (en) Fire extinguisher
US3099825A (en) Control units for fire protective signaling systems
GB1045875A (en) Improvements in or relating to electrical loading indication means
GB747185A (en) Improvements in thermally-operated electrical circuit interruptors
GB250589A (en) Alarm contrivances for fire alarm and other purposes
US2595246A (en) Device for testing electrical circuits
GB637961A (en) Improvements in or relating to fusible electric cut-outs
GB1007417A (en) Improvements in cartridge fuses
GB594736A (en) Improvements in and relating to electric fuses
JPS52117097A (en) Lock continuity test circuit of protective deflation smoke gang contro l unit in automatic fire alarm equipment
SU93854A1 (en) Device for automatic alarm about the danger of freezing
GB479221A (en) Improvements in or relating to thermally operated electric switches for fire protection apparatus
GB635223A (en) Improvements in or relating to thermo-responsive electric switches
GB738991A (en) Improvements in or relating to detectors for fire alarm systems
GB547270A (en) Improvement in thermo-responsive electric switches
GB848003A (en) Improvements in or relating to temperature-responsive warning or indicating devices
GB718347A (en) Improvements in or relating to automatic electric cut-outs