High current double-break electrical contactor

Details High current double-break electrical contactor High current double-break electrical contactor

1985-06-17

1988-08-23

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200144R, 335196, H01H 3320

Patent

active

047662735

ABSTRACT:
Stationary contact, terminal and arc-runner structure for a high-current double-break electrical contactor that affords longer contact life. Each stationary contact (66,80) and turn-back arc-runner (68,82) is connected to the associated terminal (52,72). Each arc-runner (68,82) is V-shaped and has a slot (68e,82e) at its turn-back or bight portion (68b,82b) through which the associated stationary contact (66,80) extends so that its contact tip (66b,80b) is thereabove for engagement by the bridging contact (36). The stationary contacts (66,80) allow substantially straight-through current flow, no turn-back current loop, when the contacts (66,36,80) are closed under normal current conditions to retain maximum contact pressure. But at the moment of the contact opening under high overload current conditions, the arcs migrate toward the sides between the arc-runners (68c,82c) and the outer ends of the bridging contact (36) so that a turn-back condition occurs in the current flow path inducing heavy magnetic blowout forces on the respective arcs outwardly and upwardly toward the splitter plates (88,90 ) to efficiently extinguish the arcs.

REFERENCES:
patent: 4023885 (1977-05-01), Snowdon et al.
patent: 4401863 (1983-08-01), Lemmer et al.
patent: 4568805 (1986-02-01), Wycklendt
patent: 4618748 (1986-10-01), Mueller

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