PowerPacT M, P, and R-Frame circuit breakers offer a whole range of field installable accessories, allowing modifying the circuit breaker at any time in the design and build cycle. These Type L door mounted operating mechanisms feature heavy duty, all metal construction. Door mounted operating mechanisms are available for PowerPacT M and P circuit breakers. This standard shaft replacement also fits PowerPacT B, H, J, and L circuit breaker operating mechanisms. The mounting shaft depth is 7.2in to 11.625in. This product complies with UL standards.