The Danfoss 117U6004 Starting Relay is a specialized PTC starting device engineered for high-reliability motor starts in fractional horsepower compressors. Designed specifically for Danfoss FR and SC series compressors, this relay utilizes a positive temperature coefficient thermistor to manage the auxiliary start winding circuit. It is built to handle the thermal demands of 115V hermetic systems, ensuring the compressor yields consistent torque during the critical startup phase. As a direct compressor start component, it eliminates the mechanical failure points found in traditional electromagnetic relays. This Danfoss refrigeration part is essential for technicians performing reactive maintenance or system overhauls where hermetic motor starting reliability is non-negotiable. Proper installation ensures the motor exits the start winding cycle efficiently, reducing the risk of winding overheating and optimizing the overall refrigeration compressor electrical performance in commercial and domestic cooling applications. Product Benefits Optimized Motor Torque: Ensures rapid transition from start to run windings for 115V Danfoss compressors. Resilient Design: Solid-state PTC technology prevents mechanical wear and contact pitting common in standard relays. Precision Compatibility: Engineered as a drop-in replacement for Danfoss 117U series starting devices to maintain OEM specifications. Thermal Protection: Inherently manages current flow based on temperature to protect against electrical strain during frequent cycling. Common Questions Is this relay compatible with other compressor brands? This Danfoss 117U6004 is specifically calibrated for Danfoss-manufactured hermetic units. Using it on non-specified brands may lead to improper start winding engagement or motor failure. How do I diagnose a failing PTC relay? A failed starting relay often manifests as a "clicking" sound from the overload protector or the compressor failing to turn over despite receiving power. You can verify continuity across the terminals once the device has cooled to room temperature. Does this unit require a separate start capacitor? While this PTC can operate the start winding independently in many RSIR configurations, always verify your specific compressor wiring diagram to determine if a start capacitor is required for high-torque applications. 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.
