Siemens ED43B100

Siemens ED43B100 is a 3-pole, 100 A molded-case circuit breaker from the Sentron ED4 family, designed for low-voltage protection in three-phase distribution systems. It uses a thermal-magnetic trip unit to interrupt overcurrents and provides short-circuit protection up to 18 kA. Rated for up to 480 V AC (250 V DC), with load-side lug (LD) terminations for wiring, the ED43B100 fits into standard panelboards, switchgear, and distribution panels requiring a compact, mechanically compatible protection device. The ED4 series is built for reliable protection of feeders, motors, and downstream circuits, enabling coordinated protection with other devices in the same distribution scheme. The ED43B100's 3-pole construction ensures simultaneous disconnection of all phases, enhancing safety during fault conditions. With a break capacity of 18 kA at 480 VAC and a nominal current rating of 100 A, it provides robust protection for lighting, HVAC, or motor-control feeders in medium-size commercial or light industrial installations. The device is part of Siemens' Sentron line and follows ED4 specifications for fixed trip characteristics and thermal-magnetic operation, making it suitable for new installations or replacements in existing Siemens-based electrical distributions.