Circuit breaker inertia contact assembly for resistance insertio

Details Circuit breaker inertia contact assembly for resistance insertio Circuit breaker inertia contact assembly for resistance insertio

1993-03-09

1994-04-12

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148A, 200148B, H01H 3316, H01H 3390

Patent

active

053027841

ABSTRACT:
An inertia contact designed to co-operate with a contact in series with a component, such as a resistor or a varistor, is disposed in the interrupting chamber of a circuit-breaker so as to be inserted in parallel with the contacts of the circuit-breaker for a limited period of time. The circuit-breaker includes a tube supporting moving contacts and connected to a drive rod. The inertia contact comprises a circularly-symmetrical metal casing coaxial with the tube and surrounding the tube. The casing is substantially tubular in shape with a projection flanked by two rings fitting snugly and slidably against the tube. A first end of the inertia contact is made of an alloy that is resistant to the effects of arcing. A second end of the inertia contact serves to fix the inertia contact to a first end of at least one spring. A second end of the spring is fixed to the tube. A band having a conical inside cross-section is disposed at one end of the cavity formed by the projection and the tube engages a domed collar fixed to the tube to damp the shock during relative motion of the inertia contact and the tube during contact therebetween as a result of circuit-breaker opening.

REFERENCES:
Patent Abstracts of Japan, vol. 015, No. 284 (E-1091) Jul. 18, 1991 & JP-A-31 01 025 (Toshiba) Apr. 25, 1991.

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