Danfoss 117u6004 Ptc Starting Relay Compressor

Product Description

The DANFOSS 117u6004 is a PTC (positive temperature coefficient) starting relay designed for fractional horsepower hermetic compressors. The device manages the auxiliary start winding circuit by using a thermistor element that increases resistance as it heats up, effectively switching the start winding out of the circuit once the motor reaches running speed. This solid-state design eliminates the mechanical contacts found in traditional electromagnetic current relays, reducing wear-related failure points. Refrigeration technicians install this relay during compressor servicing, reactive maintenance calls, and system overhauls where dependable motor starting is required in 115-volt hermetic refrigeration systems.

The 117u6004 is engineered for use with DANFOSS FR and SC series hermetic compressors in commercial and domestic refrigeration applications. Typical install scenarios include reach-in coolers, refrigerated display cases, and small condensing units where fractional horsepower compressors are standard. The relay mounts directly to the compressor terminal pins, making it a direct replacement component in systems requiring consistent startup torque and reliable winding protection during the critical start phase.

Key Features

• PTC thermistor element switches start winding without mechanical contacts
• Designed for 115-volt hermetic compressor systems
• Eliminates mechanical failure points associated with electromagnetic starting relays
• Reduces risk of start winding overheating by ensuring efficient exit from the start cycle
• Direct-mount design fits compressor terminal pins for straightforward replacement

Compatibility

Designed for use with DANFOSS FR and SC series fractional horsepower hermetic compressors in 115-volt refrigeration systems.

Installation Notes

Installation should be performed by a qualified refrigeration technician or licensed HVAC-R professional. De-energize the equipment and discharge any capacitors before handling compressor terminals. The relay must be oriented and seated correctly on the compressor terminal pins per the compressor manufacturer guidelines. Do not apply power to the system until the relay is fully seated and all terminal connections are secure.

Technical Specifications

• Relay Type: PTC Starting Relay
• Voltage: 115 volts
• Application: Fractional horsepower hermetic compressors

Standard Information

• Brand: DANFOSS
• Manufacturer Part Number: 117u6004