Schneider Electric B17.5 NSNBC01 Heater Element

Schneider Electric's B17.5 NSNBC01 Heater Element is a Square D thermal unit designed to provide overload protection for motors and other loads within NEMA Type S motor starters. As a member of the B17.5 family, it uses a melting alloy in a Type S/B configuration with Class 20 trip rating for reliable, fast response to overheating. The element features plug-on mounting for easy installation on compatible relays and supports circuit voltages up to 600 V, with a typical trip current range of 11.5–12.8 A. This combination of melting-alloy technology, 600 V capability, and plug-on compatibility aligns with standard B17.5 specifications and makes it a common replacement in industrial control panels and motor starter assemblies.