The S1-025-41319-000 is an auto-reset safety switch

8 Cv rating and linear bypass/mixing capability allow for accurate proportional control

Can the 780-735 replace a 30-second trial module

Always verify your furnace's wiring diagram and model configuration before installation

The externally equalized 1/4" ODF connection allows the valve to react accurately to evaporator pressure drops

Siemens Building Technology GRD221.1U Actuator 326010-701 The S1-025-41319-000 is an auto-resetThe Siemens Building Technology GRD221. 1U Actuator is a specialized 120V fire and smoke damper actuator designed for critical life safety HVACR applications. As a veteran grade two position spring return actuator, it delivers 30 lb in of torque, ensuring reliable open close operation for smoke control and combination fire smoke dampers. Built to exceed the rigors of UL555 and UL555S standards, this unit provides a nominal 30 second drive time and a