Siemens 5SJ4115-7HG42 Miniature Circuit Breaker

Siemens SENTRON 5SJ4115-7HG42 miniature circuit breaker is a 1-pole overcurrent protection device (UL 489/CSA compliant) in the 5SJ4 family. It provides a nominal current rating of 1.6 A with an AC operating voltage of 277 V and a DC rating of 60 V, and delivers a 10 kA breaking capacity, enabling rapid interruption of fault currents. The unit is a Type C breaker, designed to trip when fault current reaches roughly 5–10 times the rated current, making it suitable for general-purpose loads with moderate inrush in 277 VAC circuits. Its single-pole configuration targets individual branch circuits, commonly used to protect lighting, control circuits, or small-load segments in commercial or residential panels where 277 VAC supply is present and UL 489-compatible protection is required. The device is built for compact installation in standard enclosures and is part of Siemens SENTRON protection offerings, recognized for reliable interrupt performance and compatibility with typical panel hardware. With a 10 kA breaking capacity, it supports safe disconnection under short-circuit conditions up to that level, while the 60 V DC rating covers DC control circuits and auxiliary equipment. This model is one of several 5SJ4115 variants and aligns with Siemens’ UL/CSA listings for North American and international use, providing a consistent protection solution for low-voltage distribution where space is at a premium.