Drawout and interlock assembly for molded case circuit breakers

Details Drawout and interlock assembly for molded case circuit breakers Drawout and interlock assembly for molded case circuit breakers

1987-07-13

1988-08-02

Scott, J. R.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

H01H 920

Patent

active

047615214

ABSTRACT:
A drawout and interlock assembly for manually inserting a low-voltage molded case circuit breaker into positive electrical engagement with the plug-in power terminals of a distribution switchboard panel and then withdraw the breaker into a disconnected-test position is disclosed. The drawout position of the assembly comprises a pair of guide rails and a pair of drive rails that are secured to the back of the circuit breaker housing and cooperate with a pair of support rails and a drive mechanism that are secured to the stationary power blocks of the switchboard panel to effect a sliding telescopic interfitting of parts that permits the circuit breaker to be manually racked into connected and disconnected-test positions in an efficient reliable manner with a minimum number of parts. Automatic tripping of the breaker before it is connected to or disconnected from the switchboard panel is achieved by a toggle-actuated interlock lever that engages a depressable interlock button on the back of the circuit breaker housing when the drive mechanism is moved by an operating handle.

REFERENCES:
patent: 2273002 (1942-02-01), Mahoney
patent: 2544314 (1951-03-01), Hebbel, Jr.
patent: 2678976 (1954-05-01), Caswell
patent: 2777024 (1957-01-01), West
patent: 3343042 (1967-09-01), Cellerini et al.
patent: 4012610 (1977-03-01), Ericson et al.
patent: 4531174 (1985-07-01), Rickmann
patent: 4644120 (1987-02-01), Tedesco

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