Combined thermal and electrical cut-off device

Details Combined thermal and electrical cut-off device Combined thermal and electrical cut-off device

1979-05-10

1980-10-07

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337 12, 337185, 337403, H01H 8502, H01H 8520

Patent

active

042271690

ABSTRACT:
The device described herein is useful in applications which formerly required both a thermal cut-off device and an electrical fuse. This device will open an electrical circuit in response to either an increase in ambient temperature or an increase in electrical current. A bracket is provided to support a radial lead thermal cut-off device. The bracket is of a general C-shaped configuration and has an extending lead bar that is crimped into electrical engagement with an input lead, and one radial lead of the thermal cut-off device is crimped into electrical engagement with the second input lead. A helical conductive coil has one end welded or otherwise secured to the C-shaped bracket, and the second lead of the thermal cut-off device is crimped to the other end of the helical coil which is positioned over the thermal cut-off device so as to surround it. Thus, an ambient temperature rise may cause the thermal cut-off device to open the electrical circuit; or alternately the heat generated by the I.sup.2 R loss in the coil due to excessive electrical current flow may cause the device to also open.

REFERENCES:
patent: 3839692 (1974-10-01), Plasko
patent: 4164220 (1979-08-01), Brickell et al.

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