Siemens MD63B500 – 500A 3 Pole Molded Case Circuit Breaker Hot Picks

Engineered for heavy-duty industrial use, the MD63B500 is a 3-pole molded case circuit breaker from the Siemens Sentron family. It features an interchangeable thermal-magnetic trip unit with fixed thermal and adjustable magnetic settings for precise long-time and instantaneous (LI) protection. This 500A breaker mounts into Siemens S4, S5, P4, and P5 panelboards, as well as SB switchboards. It delivers a 50kAIC rating at 480V and includes TA3K500 line and load side lugs for installation.