This variable depth mechanism is used with Square D circuit breakers. It is designed for installation in a custom built control enclosure 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. Circuit breakers is 3 pole with a frame size of 600 A. This mechanism is also for a 3 pole PowerPacT L circuit breaker with a 600A frame size. This mechanism has a variable depth of 7.25 to 12.25 inches when used with PowerPacT D circuit breakers. This mechanism has a variable depth of 7.44 to 18.25 inches when used with PowerPacT L circuit breakers. 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