Siemens 5SJ4 111-7HG42 Miniature Circuit Breaker

Siemens 5SJ4 111-7HG42 Miniature Circuit Breaker is a one‑pole overcurrent protection device from Siemens’ SENTRON 5SJ4 family, UL 489 listed for use in low‑voltage panels and enclosures. The HG42 variant covers standard 240 V AC operation with additional voltage variants listed for select configurations (including 120 V AC and 480Y/277 V) and is designed to interrupt fault currents safely with ratings that vary by curve, up to 14 kA for certain current ranges and 10 kA for others. This 1‑pole breaker supports multiple trip characteristics—B, C, and D—allowing selection to match circuit load profiles, from lighting and receptacle branches to small motor starts, while preserving a compact form factor suitable for modular distribution schemes. It carries the safety approvals typical for Siemens protective devices (UL 489 and CSA) and is intended for use in residential and commercial applications where a recognized, replaceable overcurrent protector is required. The 5SJ4 family is designed for easy integration with Siemens accessories and mounting concepts, ensuring consistent performance within a broader SENTRON protection strategy. This model, specifically labeled 5SJ4 111-7HG42, provides a precise, UL‑listed single‑pole solution for circuits needing controlled tripping behavior and reliable protection in standard distribution boards.