Rheem-Ruud 42-18287-12 Relay

The Rheem-Ruud 42-18287-12 Relay is a heavy-duty DPDT (Double Pole Double Throw) power relay engineered for precision switching in residential and commercial HVAC systems. This 24V coil relay is a critical component for controlling high-current loads, featuring a 12-amp contact rating that ensures durability under cycling demands. Designed as a direct OEM replacement for various Rheem and Ruud air handlers and furnaces, it facilitates the switching of multiple circuits simultaneously, commonly managing blower motors and heating elements. The inductive load capacity is optimized for electromagnetic interference suppression, maintaining signal integrity across the control board. For technicians troubleshooting HVAC contactor issues or intermittent blower failures, this switching relay provides a reliable inductive rating and secure terminal connections to prevent voltage drops. Proper wiring of a 24V DPDT relay is simplified by the standard footprint, allowing for streamlined integration into existing Rheem furnace parts assemblies and ensuring optimal HVAC system performance.

• Dual Circuit Control: The DPDT configuration allows for simultaneous management of two separate circuits, ideal for complex sequencing.
• OEM Compatibility: Specifically engineered for Rheem-Ruud equipment, ensuring exact physical fit and electrical matching.
• High Ampacity: Rated at 12 Amps, providing robust handling of startup inrush currents for motors and inductive loads.
• Compact Enclosure: Designed for tight control panels while maintaining adequate heat dissipation during high-duty cycles.

Can I use this relay to replace a single pole relay?
While a DPDT relay can theoretically handle single-pole applications by using only one set of contacts, always verify the coil voltage and amperage requirements to ensure the Rheem 42-18287-12 aligns with the original manufacturer specifications.

How do I test the coil on the 42-18287-12?
Set your multimeter to ohms and check for continuity across the 24V coil terminals. An open circuit or a reading of zero ohms typically indicates a failed solenoid within the relay structure.

What causes these relays to chatter?
Chattering is usually the result of a low control voltage (less than 24V) or a failing transformer, preventing the magnetic field from holding the contacts steady under load.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.