Circuit interrupting device

Details Circuit interrupting device Circuit interrupting device

1978-05-24

1980-09-02

Moses, R. L.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337275, 337279, H01H 8540

Patent

active

042209420

ABSTRACT:
An improved circuit interrupting device includes a pair of contacts which are relatively movable and between which an arc is established. Following melting of a fusible element, a stored energy source relatively moves the contacts apart to elongate the arc, and a container of pressurized dielectric fluid simultaneously directs fluid from a port at the arc. The fluid and the arc elongation ultimately extinguish the arc. A fusible diaphragm normally closes the port to prevent the escape of fluid, and also, due to its mechanical attachment to the contacts, restrains relative movement therebetween. The fusible element is so connected as to normally shunt current through the device away from the diaphragm. When the fusible element melts, all of the current through the device flows through and melts the diaphragm. As the diaphragm melts, two results are effected: fluid is permitted to escape from the port, and relative movement between the contacts occurs.

REFERENCES:
patent: 2343422 (1944-03-01), Rawlins
patent: 2429518 (1947-10-01), Kyle et al.

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