Motor operator with burn-out protection

Details Motor operator with burn-out protection Motor operator with burn-out protection

1996-08-19

1997-12-09

Walczak, David J.

Electricity: circuit makers and breakers

Electric switch details

Actuators

2003321, H01H 320

Patent

active

056950462

ABSTRACT:
A motor operator for a circuit breaker has a motor driven carriage which engages a circuit breaker handle and drives it between an on position and a reset position beyond off. When the carriage drives the handle to the off/reset position, an off limit switch is actuated to deenergize the motor. A fastener releasably secures a bracket slidably mounted on the carriage to a fixed member when the carriage reaches the reset position of the handle so that if the circuit breaker does not reset and rebounds toward a trip position, the bracket is extended and maintains actuation of the off limit switch. Hence, the motor is not repeatedly energized and burned out in unsuccessful attempts to reset the circuit breaker.

REFERENCES:
patent: 5196658 (1993-03-01), Gula
patent: 5354960 (1994-10-01), Erickson
patent: 5475190 (1995-12-01), Smith et al.
patent: 5504290 (1996-04-01), Baginski et al.
Installation Instructions for Motor Operator for 3-- and 4--Pole ND, NB, NC, MD, MA, MC Type Circuit Breakers and Molded Case Switches, I.L. 29C204B, Aug. 1995, Eaton, Cutler-Hammer, Westinghouse & Cutler-Hammer Products, Style No. 6634C87H02 (supersedes I.L. 299C204A dated Nov. 1993).

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