Rheem-Ruud 42-100491-09K Start Relay for HVAC Compressors

The Rheem-Ruud 42-100491-09K is a genuine OEM start relay designed for use with Rheem and Ruud residential and light commercial HVAC equipment. This essential component helps initiate compressor operation by providing the necessary electrical boost during startup, then disconnecting once the compressor reaches operating speed.

Key Features:

• Genuine Rheem-Ruud OEM replacement part ensures proper fit and function
• Designed to work with compatible Rheem and Ruud air conditioning and heat pump systems
• Helps protect compressor from startup strain by providing additional starting torque
• Direct replacement for worn or failed start relays
• Factory-specified component for reliable performance

Start relays are critical for compressor operation and should be replaced when the compressor fails to start, cycles repeatedly, or makes humming noises without starting. This component is commonly serviced during HVAC maintenance and repair. Always verify compatibility with your specific model number before ordering.