Industrial ECSR-300 U 300A 600V CL RK5 Circuit Breaker

Reliance ECSR-300 U is a 300 A, 600 V AC current-limiting fuse from the Edison Bussmann ECSR RK5 family, featuring a dual-element time-delay design for reliable protection in demanding industrial power systems. This RK5-class device is intended for feeders and branch circuits, delivering fast short-circuit clearance while tolerating normal inrush associated with motors, transformers, and other inductive loads. Rated at 600 VAC with a 300 A continuous rating, the ECSR-300 U helps safeguard conductors, switchgear, and downstream equipment in control panels, motor rooms, and distribution assemblies, making it a go-to choice where high fault-current protection and selective coordination are required.