MARS 19169 Potential Relay

The MARS 19169 Potential Relay is a high-performance motor starting relay designed for single-phase HVACR systems, specifically for CSR (Capacitor Start, Capacitor Run) and CSIR (Capacitor Start, Induction Run) compressor configurations. This potential relay features a 332V continuous coil voltage, optimized to handle high back EMF (BEMF) across the start winding without premature failure. With a pick-up voltage range of 180V to 193V and a drop-out voltage maximum of 105V, it ensures precise timing for disconnecting the start capacitor once the motor reaches approximately 75% to 80% speed. Rated for 35 amp contact rating at 480 VAC, this 169 potential relay provides a rugged, non-positional mounting solution with a universal break-off bracket, making it a reliable hard start kit component or a direct OEM replacement relay. It utilizes standard 1/4 inch quick connect terminals (1, 2, and 5) for straightforward wiring-in of HVAC compressor service and repairs, ensuring maximum torque and system efficiency.

• Universal Compatibility: Features a break-off bracket to match existing HVAC mounting holes for efficient field replacement.
• High Current Capacity: Heavy-duty 35 amp contacts built to withstand the high inrush currents of refrigeration and AC compressors.
• Precise Motor Protection: Prevents start capacitor overheating by accurately sensing motor speed through back EMF induction.
• Non-Positional Installation: Unlike older mercury-based switches, this electronic potential relay operates in any physical orientation.

• How do I test a MARS 19169 Potential Relay? Set your multimeter to the ohms scale; you should find near-zero resistance between terminals 1 and 2 (normally closed). The coil (terminals 2 and 5) should show high resistance, typically between 10k and 15k ohms.
• What does a 332V coil voltage mean? This is the continuous coil voltage rating. It represents the maximum back EMF voltage the coil can safely handle while the motor is running at full speed without burning out.
• Can this be used for hard start applications? Yes, this motor start relay is the primary control component used in professional-grade hard start kits to improve compressor starting torque on systems with long linesets or sticking valves.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.