Product Description: The Siemens JXD63L400L is a Molded Case Circuit Breaker from the Sentron Series. It features a 3-pole design with a 600V, 400A rating and a 35kA@480V AIC rating. This breaker uses a Feed-Thru connection and offers Magnetic Only protection. It is part of the JD Frame size and is UL Listed for safety compliance.