Dometic 4450037544 Air Conditioner PTCR Start Relay

The Dometic 4450037544 is an OEM replacement PTCR (Positive Temperature Coefficient Resistor) start relay designed for use in Dometic rooftop air conditioning units. The PTCR relay assists the compressor motor during startup by providing an initial current surge, then automatically dropping out of the circuit once the compressor reaches operating speed — eliminating the need for a traditional electromechanical start relay.

Key Features:

• OEM Dometic replacement part — ensures proper fit and compatibility
• Solid-state PTCR design with no moving parts for improved reliability
• Reduces compressor startup amp draw to help protect electrical systems
• Drop-in replacement for worn or failed start relays in Dometic AC units
• Helps restore proper compressor starting performance

This relay is a critical component in maintaining the reliable operation of your Dometic air conditioning system. Replacing a faulty PTCR relay can resolve hard-start conditions, compressor failures to start, or tripped breakers during AC startup.