Temperature-sensitive switch

Details Temperature-sensitive switch Temperature-sensitive switch

1995-08-09

1997-03-25

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 32, 361105, 337107, H02H 504

Patent

active

056150725

ABSTRACT:
A temperature-sensitive switch (10) for protecting electrical parts against excess temperature and/or excess current comprises a bimetallic switching device (14) which opens or closes its contacts in response to an excess temperature. Said switching device (14) is contained in a casing (17) having a pot-like bottom part (18) and cover (19). A first heating resistor (15) is connected in circuit with the switching device (14) such that it locks the switching device (14) in a self-holding manner when said switching device (14) is actuated in response to an excess temperature. A second heating resistor (16) is connected in circuit with said switching device (14) and produces heat in response to a current flow therethrough. When an excess current flows through the second heating resistor (16) the switching device (14) is actuated. Both, the first and second heating resistors (15, 16) are integrated in said cover (19) of said casing (17).

REFERENCES:
patent: 4849729 (1989-07-01), Hofsass
patent: 5367279 (1994-11-01), Sakai

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