Switchboard drawout having trip interlock and position indicating apparatus

Drawout apparauts for racking a circuit breaker into and out of a compartment in an electrical enclosure, wherein the breaker and the enclosure are respectively equipped with plural associated stab and receiver primary terminal connectors, said drawout apparatus comprising, in combination:

• A. a carriage mounting the circuit breaker;
• B. means mounted by the enclosure and supporting said carriage for movement between a test position where the stab and receiver connectors are in separated relation and an engaged position where contact elements of the associated primary stab and receiver connectors are in lapped relation;
• C. a racking mechanism mechanically assisting manually induced movement to said carriage and breaker between said test and engaged positions;
• D. a joint clamping mechanism mounted by said carriage, said clamping mechanism manually operable between joint unclamped and joint clamped conditions, with said racking mechanism in said unclamped condition, the contact elements of associated stab and receiver connectors readily move into and out of lapped relation as said carriage and breaker move into and out of said engaged position, with said clamping mechanism in its clamped condition and the breaker and carriage in said engaged position, the lapped contact elements of associated stab and receiver connectors are clamped by said clamping mechanism in secure electrical connection;
• and
• E. a trip interlock controllably operated by said racking and clamping mechanisms to selectively actuate a tripping element of the circuit breaker such as to enable closure of the circuit breaker only while said carriage and circuit breaker are in said test position and while in said engaged position with said clamping mechanism in said clamped condition, further to inhibit closure of the circuit breaker while removed from said test position when said clamping mechanism is in its unclamped condition, and still further to trip the circuit breaker incident to initial movement of said carriage out of said test position and upon initial operation of said clamping mechanism from its clamped to unclamped conditions.