Description
Mars 19163 Potential Relay Overview
The Mars 19163 is a 163 Series Potential Relay designed to assist single-phase compressor motors with starting by dropping the start capacitor out of the circuit once the motor reaches sufficient speed. Operating at a pickup voltage of 170V, this relay ensures reliable, consistent compressor starts while protecting motor windings from overheating caused by prolonged start capacitor engagement.
How Potential Relays Work
Potential relays monitor the back-EMF (electromotive force) generated by the compressor motor’s start winding. As the motor accelerates, the voltage across the start winding rises. When it reaches the relay’s pickup voltage — 170V for the Mars 19163 — the relay opens its normally closed contacts, removing the start capacitor from the circuit. This allows the motor to run efficiently on the run capacitor alone.
Key Features
- Pickup voltage: 170V
- Designed for use with single-phase hermetic and semi-hermetic compressor motors
- Normally closed contacts open upon reaching pickup voltage to drop out the start capacitor
- Compact, plug-in relay design for easy installation and replacement
- Compatible with a wide range of HVAC/R compressor applications
- Mars 163 Series proven reliability for residential and light commercial systems
Typical Applications
- Air conditioning compressors
- Heat pump compressors
- Refrigeration compressors
- Hard-start kit assemblies
Why Choose Mars Potential Relays
Mars (Motors & Armatures) is a trusted name in HVAC/R electrical components. The 19163 potential relay is built to exacting standards, delivering dependable performance in demanding heating, cooling, and refrigeration environments. Whether you’re replacing a failed relay or building out a hard-start kit, the Mars 19163 provides the precise voltage sensitivity needed to protect compressor motors and extend equipment life.
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