Description
The Mars 19006 is a heavy-duty potential relay engineered to provide dependable hard-start and run-capacitor switching for single-phase compressor motors in residential and light commercial HVAC systems. With a 420V coil voltage rating, this relay is designed to drop out the start capacitor at the precise moment the compressor motor reaches the appropriate speed, protecting the capacitor and motor windings from overload and extending overall system life.
Key Features
- 420V coil voltage for accurate and consistent dropout performance
- Designed for use with single-phase compressor motors requiring external start assistance
- Helps reduce compressor starting current draw, easing stress on electrical components
- Compact, rugged construction for long service life in demanding HVAC environments
- Direct replacement potential relay for a wide range of residential and light commercial applications
- Simple wiring connections for fast, straightforward installation
How a Potential Relay Works
A potential relay senses the back-EMF (electromotive force) generated by the compressor motor as it accelerates. Once the motor reaches approximately 75% of its full operating speed, the voltage across the start winding rises to the relay’s pickup voltage, causing the normally closed contacts to open and disconnect the start capacitor from the circuit. This precise switching action prevents the start capacitor from remaining energized during normal operation, which would cause premature capacitor failure and potential motor damage.
Typical Applications
- Air conditioning compressors
- Heat pump compressors
- Refrigeration compressors
- Single-phase PSC and CSCR motor circuits requiring hard-start assistance
Why Choose Mars Relays
Mars (Motor & Armature) has been a trusted name in HVAC electrical components for decades. Their potential relays are manufactured to exacting standards, ensuring consistent coil dropout voltages and long contact life. The Mars 19006 is an ideal choice for HVAC technicians seeking a reliable, cost-effective solution for compressor hard-start applications.
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