Protector for electric circuits

Details Protector for electric circuits Protector for electric circuits

1975-11-17

1977-11-15

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337161, H01H 8504

Patent

active

040587860

ABSTRACT:
The dual element fuse of the present invention has at least one fusible element and at least one mass of heat softenable material; and that fusible element will respond to a short circuit to fuse and thereby assure opening of the circuit, whereas that mass of heat softenable material will respond to a long-continued relatively-low potentially-hurtful overcurrent to soften and thereby initiate opening of the circuit. That dual element fuse has a shunt element which shunts the mass of heat softenable material and which will fuse after that mass of heat softenable material has initiated opening of the circuit. That shunt element has a current rating which is larger than the current rating of the mass of heat softenable material; and that shunt element has a current-interrupting characteristic which has the same shape as that of the current-interrupting characteristic of the fusible element.

REFERENCES:
patent: 3253104 (1966-05-01), Fister
patent: 3735317 (1973-05-01), Jacobs

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