Variable depth mechanisms for use with Square D circuit breakers are designed for installation in custom built control enclosures where main or branch circuit protective devices are required. All circuit breaker operating mechanisms are suitable for either right or left hand flange mounting and are convertible on the job. This mechanism is for a 2 or 3 pole PowerPacT B circuit breaker with a 125A frame size. This mechanism has a variable depth of 5.88 to 17.75 inches. Handle mechanism must be ordered separately. A 9422A1 or a 9422A2 handle mechanisms is normally used Operating mechanism is UL Component Recognized and CSA certified