Siemens Building Technology SFA71U/25G Actuator 319825-402 as standard boiler transformers may

as standard boiler transformers may not have the VA capacity to handle both the burner and the feeder

Wide Operating Range: Performance-tested for temperatures ranging from -40°F to 250°F to handle extreme environmental conditions

Featuring a robust 3/4" gas connection

This setup allows for simultaneous status signaling (NO) and electrical interlocking (NC) to prevent short circuits or to provide "run/fault" status feedback to a head-end controller

Common Questions What is the primary advantage of a NEMA "Half Size" starter

Siemens Building Technology SFA71U/25G Actuator 319825-402 as standard boiler transformers mayThe Siemens SFA71U 25G Actuator is a professional grade 2 position zone valve actuator designed for reliable control in hydronic systems. Engineered for seamless integration with the Siemens 599 Series zone valves, this 24V normally closed actuator provides a robust 105 N force to ensure tight shut off in high demand HVAC applications. This spring return valve actuator facilitates a mechanical fail safe in the event of power loss, making it a critical