Danfoss 117U4085 Starter Relay

The Danfoss 117U4085 Starter Relay is a specialized PTC starting device specifically engineered for Danfoss SC series compressors. Designed for 115V applications, this current-operated relay ensures reliable motor starting by providing high torque during the initial phase of the compression cycle. Proper installation of this 103N0015 starter relay is critical for maintaining correct amperage draw and protecting the motor windings from premature failure. For technicians servicing commercial refrigeration equipment, this component provides the exact electrical characteristics required for thermal stability and consistent switching cycles. It is compatible with a wide range of R134a and R404A compressors, acting as a direct replacement for worn or damaged starting components. When diagnosing compressor starting issues, ensuring the correct resistance values across the starting relay terminals is essential for system longevity and efficiency under high-load conditions.

Key Benefits:

• Compatible with high-performance Danfoss SC compressor models.
• Engineered for 115V refrigeration systems requiring precise current control.
• Robust PTC thermistor design ensures durable switching performance.
• Simplifies compressor electrical troubleshooting and field repairs.
• Prevents motor stress by ensuring proper starting winding engagement.

Common Technical Questions:

How do I test a Danfoss 117U4085 for continuity?
Using a multimeter, measure the resistance across the terminals. A defective starter relay will often show an open circuit or infinite resistance, indicating the internal PTC element has failed.

What are the symptoms of a failing compressor relay?
Common signs include the compressor clicking but failing to start, short cycling, or tripping the circuit breaker due to high locked rotor amps (LRA).

Can I use this relay on 230V systems?
No, the 117U4085 is specifically rated for 115V operation. Using it on 230V equipment will cause immediate component failure and potential motor damage.

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.