W31

1.29A to 1.53A full load current range (varies by starter size) | 600VAC maximum operational voltage rating | Class 20 standard time-delay trip threshold | Type W eutectic alloy thermal overload relay heater element block engineered for dependable motor branch circuit protection. | Industrial motor control centers (MCCs), automated factory water pump stations, multi-horsepower conveyor line starters, building HVAC fan controls. | W31 | None | None | Allen-Bradley W31, Type W Heater, Bulletin 500 Overload Unit, Rockwell W31 | Emergency Overload Rework Test: Bolted directly into a vintage Bulletin 500 size 1 magnetic starter assembly on a diagnostics test bench to simulate standard structural overcurrent heat conditions during motor control panel testing. | Allen-Bradley / Rockwell Automation NEMA Motor Control Protection Lines: This standardized interchangeable thermal unit was custom-engineered by Allen-Bradley to safeguard industrial motor windings against sustained overload stress profiles across Bulletin 100, 500, 609, and 1200 starter series platforms