Description
The US Motors 3274 is a replacement Single-Pole Double-Throw (SPDT) Proof of Closure Switch designed to confirm the fully closed position of dampers, valves, or actuators in HVAC and building automation systems. This switch provides a critical safety and control signal, ensuring that downstream equipment — such as air handling units, boilers, or ventilation systems — only operate when the associated damper or valve has achieved its fully closed position.
Key Features
- SPDT (Single-Pole Double-Throw) switching action for versatile control circuit integration
- Proof of closure functionality confirms damper or valve is fully closed before allowing system operation
- Direct replacement part engineered to US Motors specifications
- Compatible with US Motors actuators and damper drive applications
- Supports both normally open (NO) and normally closed (NC) circuit configurations
- Compact, durable construction suited for commercial and industrial HVAC environments
Typical Applications
- Damper actuator position confirmation in air handling units (AHUs)
- Valve closure verification in hydronic and steam systems
- Interlock circuits for boilers, furnaces, and ventilation equipment
- Building automation and direct digital control (DDC) systems
- Safety interlock sequences requiring confirmed closed-position feedback
Why Choose the US Motors 3274?
Using a genuine US Motors replacement switch ensures proper fit, reliable electrical contact, and accurate position feedback — helping maintain system safety and operational integrity. Substituting off-spec switches can result in nuisance lockouts or, more critically, unsafe equipment operation. The 3274 is the correct factory-specified replacement for US Motors actuator assemblies requiring SPDT proof of closure switching.
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