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Ships within 48 hours · Estimated delivery Sep 7 - Sep 12
Direct Compatibility: Precision engineered to replace Grindmaster A537-048R-UR and MET133-UR components
Bypassing a safety thermal cut-off is never recommended by technicians
including many infrared tube heaters and unit heaters
Reduced Downtime: This pre-assembled kit allows technicians to perform rapid onsite repairs
York S1-024-21678-700 Relay Direct Compatibility: Precision engineered toThe 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