Description
Mars 19004 Potential Relay Overview
The Mars 19004 is a Type 65 potential relay designed for use in single-phase compressor hard-start and motor-starting applications. With a 395V coil voltage rating, this relay monitors the back-EMF generated by the start winding and drops out the start capacitor at the precise moment the compressor motor reaches operating speed — protecting both the capacitor and motor from overload.
How It Works
Potential relays operate by sensing the voltage developed across the start winding as the motor accelerates. Once the motor reaches approximately 75% of its rated speed, the back-EMF rises high enough to energize the relay coil, opening the normally closed contact and removing the start capacitor from the circuit. This ensures smooth, reliable compressor starts without damaging electrical components.
Key Features
- Type 65 potential relay for single-phase compressor applications
- 395V coil pickup voltage for precise start-capacitor dropout
- Normally closed contact opens upon motor acceleration
- Compact design for easy installation in existing control panels
- Compatible with a wide range of single-phase compressors
- Manufactured by Mars — a trusted name in HVAC electrical components
Typical Applications
- Air conditioning and refrigeration compressor hard-start circuits
- Single-phase motor starting with start capacitor assistance
- Replacement for worn or failed OEM potential relays
- Hard-start kit assemblies for residential and light commercial equipment
Why Choose Mars Potential Relays
Mars electrical components are engineered for the demands of HVAC/R service professionals. The 19004 potential relay delivers consistent performance, long service life, and dependable compressor protection — making it a go-to choice for technicians replacing failed starting components in the field.
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