Thermal cut-off fuse

Details Thermal cut-off fuse Thermal cut-off fuse

1978-09-05

1980-02-19

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337408, H01H 3776

Patent

active

041896971

ABSTRACT:
In a thermal cut-off fuse of the class wherein electrical continuity of a contact means is maintained through the medium of a thermal pellet which is solid in its normal state and melts into a liquid state when the ambient temperature rises to reach a fixed level and the electrical continuity of the contact means, therefore, is broken by the thermal pellet being liquefied upon elevation of the ambient temperature to the fixed level, the improvement is attained by causing the thermal pellet which is in a solid state under the normal condition to restrain the movement of an actuating means kept pressed forward by an energizing means in such a way that, when the thermal pellet melts into its liquid state upon elevation of the ambient temperature to the fixed level, the thermal pellet releases the actuating means from the aforementioned restraint and enables it to thrust forward by virtue of the pressure constantly exerted by the energizing means to thereby break the electrical continuity of the contact means and retain the broken state of electrical continuity thereafter.

REFERENCES:
patent: 2934628 (1960-04-01), Massar et al.
patent: 3930215 (1975-12-01), Senor
patent: 3944960 (1976-03-01), Audette et al.
patent: 4065741 (1977-12-01), Sakamoto et al.

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