Siemens E43B020U Three-Phase Molded Case Circuit Breaker

Siemens ED43B020U is a three‑pole, 20 A molded‑case circuit breaker from the Sentron ED frame (often listed as E43B020U) that delivers thermal‑magnetic protection for 480 V AC circuits. It is rated to interrupt faults up to 18 kA at 480 V, making it suitable for protecting 3‑phase motors, feeders, and other loads in panelboards and switchgear. The device uses a thermal‑magnetic trip system with distinct long‑time and instantaneous trip characteristics, and it provides load‑side lug terminals for straightforward panel connections. As part of Siemens’ Sentron ED/Sentron molded‑case family, this breaker is designed for reliable, compact protection in industrial and commercial electrical installations where a 20‑amp, 3‑pole device is required.