Product Description: The Siemens JD63T400 is a Sentron Series trip unit designed for molded case circuit breakers. It provides reliable thermal magnetic protection with LI - Long-Time and Instantaneous functions. This 3-pole unit is rated for 600V and 400A, offering a 35kA@480V AIC rating and bolt-on connection for efficient circuit protection. It is compatible with JD, HJD, HJXD, HHJD, and HHJXD frames.