<p>A drawer-type circuit breaker arrangement of the type adapted to be disposed in an engaged and disengaged position within a housing (14) and a disengaged position outside said housing (14) on extendable support rails (16) is provided with latches (17) which will prevent the extension of the guide rails (16) until the circuit breaker (12) is moved from the engaged position to the disengaged position within the housing (14). The movement of the circuit breaker (12) to the disengaged position operates the latches (17) to permit extension of the support rails (16) while still preventing movement of the circuit breaker (12) onto the support rails (16). Movement of the support rails (16) to the fully extended position allows the latches (17) to be released by movement of the circuit breaker (12) to allow the circuit breaker (12) to be withdrawn out of the housing (14) onto the support rails (16). Actuating levers (23) for engaging and disengaging the circuit breaker are provided on opposite sides of the circuit breaker (12) for movement in respective slots (14a) and notches (14b) to smoothly and efficiently carry out the engaging and disengaging operation while preventing undesirable vertical movement of the circuit breaker (12) relative to the housing (14).</p>
