Contact sequencing arrangement for rotary double break switch

Details Contact sequencing arrangement for rotary double break switch Contact sequencing arrangement for rotary double break switch

1985-02-21

1986-09-30

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

361 3, H01H 3314

Patent

active

046148515

ABSTRACT:
Stationary contacts (12) of a multi-pole disconnect or safety switch are arranged to be engaged by one of a rotatably movable bridging contact (2) before engagement of the other end thereof with a second set of stationary contacts (10). Stationary contacts (12) of adjacent switch poles are positioned on alternate ends for increasing the phase-to-phase failure distance, and one stationary contact (10a) may be arranged to close one or two milliseconds late to produce single phasing for a short time under fault current conditions during which time current limiting fuses (14) begin to open the circuit.

REFERENCES:
patent: 1807526 (1931-05-01), Hammerly
patent: 2620417 (1952-12-01), Lewis
patent: 3154656 (1964-10-01), Gussow et al.
patent: 3632929 (1972-01-01), Butler
patent: 4459629 (1984-07-01), Titus

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