Square D B79.0 3-Phase Molded Case Circuit Breaker

Square D by Schneider Electric B79.0 is a melting-alloy thermal unit used as the thermal trip element in Square D motor-control relays for three‑phase applications. Rated for up to 600 V AC and a 40°C ambient, the B79.0 is designed to be used with standard Class 20 overload-relay assemblies and melts at a precise current to open the circuit under overload conditions. This plug‑in thermal unit is intended for use with melting-alloy thermal overload relays in Square D starter configurations, providing time‑delayed protection for 3‑phase motors. Typical trip current range is approximately 38.7 to 45 A, aligning with Class 20 protective characteristics.