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. Mechanism will work with PowerPact L circuit breakers. Circuit breakers is 3 pole with a frame size of 600 A. The variable depth mounting range is 7.44 to 18.25 inches. 9422A operating handle is ordered separately. Switch is UL component recognized and CSA certified. 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