Siemens 5SJ4 313-8HG42 NSJ Miniature Circuit Breaker is a three-pole D‑curve MCB rated at 13 A for use on 400 VAC systems. As part of the 5SJ4 NSJ family, it provides overcurrent protection for three‑phase circuits in distribution panels and industrial equipment, featuring a magnetic‑trip NSJ mechanism for fast fault clearance. The 313‑8HG42 suffix designates the exact catalog variant within Siemens’ HG42 lineup, ensuring precise replacement compatibility with Siemens low‑voltage protection components.
