Radial lead thermal cut-off device

Details Radial lead thermal cut-off device Radial lead thermal cut-off device

1978-10-20

1980-01-29

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337408, H01H 3776

Patent

active

041863666

ABSTRACT:
A radial lead thermal cut-off device for opening an electrical circuit when a predetermined temperature is disclosed. Electrical connection between the radial leads is maintained by thin spring contact which is forced against the terminal heads of the leads of the device. The spring contact is forced into contact by a disc against the force of a coiled bias spring that engages the center of the spring contact. The disc is held in place by a temperature-sensing pellet of organic material which melts at a predetermined temperature and which preferably incorporates a multitude of spherical glass beads filling that greatly increase its strength. The pellet has a centrally located cavity so that when the organic material of the pellet melts the material fills a volume having a smaller transverse dimension. This allows the disc to move as the compression force of the coiled spring is relieved, which in turn opens the circuit between the contact members as the thin spring contact is forced away from the lead heads by the coiled spring.

REFERENCES:
patent: 2955179 (1960-10-01), Milton et al.
patent: 3956725 (1976-05-01), Merrill et al.
patent: 4065741 (1977-12-01), Sakamoto et al.

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