Rheem Furnace Parts 42-21786-81 Defrost Relay

Defrost Relay for Rheem furnace parts 42-21786-81 delivers reliable defrost operation and dependable performance in HVAC systems.

As an AC operated defrost relay, it handles multiple configurations for versatile control, including (2) DPDT and (1) SPST with NO/NC contacts. The coil voltage is 24 Volt AC at 50/60 Hz, making it compatible with standard furnace wiring and control boards.

Key specifications include contact voltage ratings of 120/277/600 Volt and 3/16 inch quick-connect terminals, ensuring easy installation and secure connections in tight panel spaces.

Power handling is robust, rated at 1/3 HP at 120 Volt, 1/2 HP at 277 Volt, and 3/4 HP at 600 Volt, providing reliable performance across typical Rheem furnace systems.

• Contact configurations: (2) DPDT and (1) SPST (NO/NC)
• Coil voltage: 24V AC at 50/60 Hz
• Contact voltage: 120/277/600 V
• Terminals: 3/16 inch quick-connect
• Power ratings: 1/3 HP at 120V, 1/2 HP at 277V, 3/4 HP at 600V