The MARS 19008 Relay is an industry-standard 336V 69 Potential Relay engineered for heavy-duty single-phase capacitor-start/capacitor-run motors where high starting torque is essential. This motor-starting component operates on the back-EMF principle, utilizing a high-resistance coil to precisely disconnect the start capacitor once the compressor reaches approximately 75% of its operating speed. Rated at 35 Amps with a continuous coil voltage of 336V, the MARS 19008 features non-positional mounting and a universal break-off bracket, allowing it to replace thousands of OEM configurations on the fly. Each unit includes a QC-6 kit for seamless conversion from screw-on to push-on terminals, making it a critical stock item for any professional service truck targeting HVAC compressor troubleshooting and restoration. Key Benefits Universal Compatibility: Designed to replace a vast range of OEM potential relays, reducing inventory overhead for field technicians. Flexible Mounting: The non-positional design and snap-off universal bracket facilitate installation in tight electrical enclosures without compromising performance. Reliable Switching: Utilizes normally closed contacts between terminals 1 and 2 to ensure the start capacitor is engaged during the brief startup phase and safely removed upon reaching pickup voltage. Terminal Versatility: Includes the QC-6 conversion kit, providing the option to switch between screw and quick-connect terminal styles as required by the application. A2L Compliant: Suitable for modern refrigeration systems, meeting current regulatory safety standards for HVACR motor starting components. Common Questions What are the wiring positions for the MARS 19008? Following the standard 5-2-1 rule: terminal 5 connects to the common side of the line, terminal 2 to the start winding (back-EMF sensing), and terminal 1 to the start capacitor to complete the start circuit. How do I test if a potential relay has failed? Technicians should use a multimeter to check for continuity between terminals 1 and 2. A reading of "OL" or open circuit while the motor is at rest typically indicates pitted or failed contacts. Can this relay be used on a 1/3 HP motor? Yes, the MARS 19008 is rated for 1/3 HP applications, provided the pickup voltage (180 to 195 VAC) and dropout voltage (105 VAC) match the motor's specific torque requirements. This item is not eligible for free shipping. 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.
