Limiting travel of circuit breaker operating lever

Apparatus contacting the handle arm 62 of a circuit breaker when moveable contact(s) 19 of the circuit breaker is welded to its fixed contact thereby preventing operating lever 62 from being moved to the full off position comprises a lock 70 elevated by a cam 72 when the moveable contacts are in the closed position. If operating lever 62 is moved towards the off position, a locking surface 74 of a handle arm 75 which is connected to lever 72 engages a projecting member 76 of lock 70 thereby preventing the handle arm 75 and thus operating lever 62 from advancing to the full off position. This prevents operating lever 62 from falsely assuming the off position when the contacts of the circuit breaker are closed and also provides a visual indication of the closed contact condition.