Rheem Furnace Parts 42-21571-08 Control Relay

Rheem 42-21571-08 Control Relay is your go-to replacement part for dependable furnace operation. This sealed-case, AC-operated relay uses a 24 Volt AC coil at 50/60 Hz to deliver precise switching in standard Rheem furnace systems. With a 120/230V contact rating and SPST normally open configuration, it provides reliable control of furnace circuits while staying easy to install in your existing setup. The 1/4 inch quick-connect terminals simplify wiring for a clean, secure connection.

• Sealed-case, AC-operated design protects the relay from dust, moisture, and furnace vapors for long service life.
• 24V AC coil (50/60 Hz) delivers consistent, responsive control for standard furnace controllers.
• SPST Normally Open configuration provides simple, reliable switching of furnace circuits.
• Broad voltage and current ratings: 120/230V contact voltage; 8A full-load at 230V; 60A at 120V; 48A at 230V with locked rotor.
• 1/4 inch quick-connect terminals enable fast, secure installation and easy field replacement.

Designed to fit seamlessly within the Rheem furnace parts ecosystem, this control relay delivers dependable performance, helping maintain heating efficiency and system safety.