Pressurized fluid circuit interrupting device having a...

Details Pressurized fluid circuit interrupting device having a... Pressurized fluid circuit interrupting device having a...

H - Electricity

01

H

306/138

H01H 37/76 (2006.01) H01H 85/40 (2006.01)

Patent

CA 1106424

IMPROVED CIRCUIT INTERRUPTING DEVICE 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 rela- tively 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.

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