York S1-024-21678-700 Relay Reliable Signaling: The 1 N/O

Reliable Signaling: The 1 N/O (Normally Open) contact configuration provides a clean circuit closure for system feedback and secondary load control

this is an automatic reset snap disc

Reduced Downtime: This pre-assembled kit allows technicians to perform rapid onsite repairs

Precision Poppet Design: Utilizes a high-grade rubber seat poppet to ensure consistent regulation and tight shutoff at low flow rates

Bypassing a safety thermal cut-off is never recommended by technicians

York S1-024-21678-700 Relay Reliable Signaling: The 1 N/OThe York S1 024 21678 700 is an OEM 24V SPDT Relay designed for heavy duty switching in residential and commercial HVAC control systems. This component serves as the direct 024 21678 000 replacement, ensuring seamless integration into existing control boards without requiring circuit modifications. Engineered with a 24VAC 50 60Hz coil, this Single Pole Double Throw relay provides the necessary electrical isolation between low voltage thermostat