Description
The Copeland 90-340S1 is a surface mount magnetic relay designed for HVAC control circuit switching applications in residential and light commercial heating and cooling equipment, providing reliable electrically operated contact switching between thermostat or control board signals and blower motor, fan, and auxiliary load circuits in furnaces, air handlers, and related HVAC systems. The surface mount configuration allows the relay to be secured directly to a panel, bracket, or equipment enclosure surface within the unit, positioning it for straightforward wiring access and simplified replacement during field service without the need for DIN rail mounting hardware or specialized mounting accessories. As a magnetic relay, the 90-340S1 uses electromagnetic coil actuation to open and close its contacts, delivering consistent and repeatable switching performance across the operating cycles of a normal heating and cooling season. Relay failure in HVAC control systems presents across a range of symptoms including blower motor non-response, continuous fan operation from welded contacts, and intermittent operation from degraded coil performance, making correct relay identification and direct OEM-matched replacement critical for restoring normal control sequencing. As an OEM-quality White-Rodgers replacement, the 90-340S1 is suited for efficient field identification and swap-out by HVAC technicians servicing residential and light commercial equipment where White-Rodgers surface mount relays are specified.
Key Features
- Surface mount configuration allows direct installation to panels, brackets, or equipment enclosure surfaces without DIN rail hardware
- Magnetic relay design uses electromagnetic coil actuation for consistent, repeatable contact switching across operating cycles
- Suited for blower motor, fan, and auxiliary load circuit switching in furnaces, air handlers, and related HVAC equipment
- Interfaces thermostat and control board low-voltage signals with line-voltage or higher-current load circuits
- Addresses relay failure symptoms including blower non-response, welded contact continuous fan operation, and intermittent coil performance
- OEM-quality White-Rodgers replacement engineered to original electrical and mechanical specifications for direct field substitution
- Surface mount design supports straightforward wiring access and simplified swap-out during field service calls
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