Danfoss 117U3302 Motor Protector

The Danfoss 117U3302 Motor Protector is an essential hermetic compressor safety device engineered to provide robust overload protection for electrical motors in commercial HVACR systems. As a critical component in the diagnostic and protection circuit, it monitors the motor winding temperature and current draw to prevent catastrophic failure caused by locked rotor conditions, phase loss, or sustained electrical overloads. This technical compressor motor protector is designed for 115V to 220V applications, utilizing a precise bi-metal thermal actuator to interrupt the circuit and protect the insulation integrity of the internal windings. Veteran technicians rely on this OEM Danfoss part to maintain system reliability in demanding industrial environments where voltage fluctuations are common. Its durable metal construction ensures long-term performance and high thermal sensitivity, allowing it to trip before heat damage occurs to the compressor’s motor stack. Proper integration of this internal motor protector into the starting device assembly is vital for preventing expensive downtime in light commercial refrigeration units.

• Prevents motor winding burnout by responding rapidly to excessive current and temperature spikes.
• Ensures compressor reliability in variable load environments by maintaining strict operating limits.
• Engineered with industrial-grade metal housing for high durability and environmental resistance.
• Supports a wide voltage range of 115V-220V, making it a versatile choice for various refrigeration applications.
• Facilitates accurate HVACR troubleshooting by acting as a definitive safety cutoff during electrical faults.

• How do I test the Danfoss 117U3302 for continuity? Use a multimeter to check the resistance across the protector terminals; an open circuit suggests the protector has tripped or failed internally.
• What causes this motor protector to trip frequently? Common causes include a failing start capacitor, high head pressure, or a shorted compressor winding that increases current draw.
• Is this protector compatible with all Danfoss compressors? This specific model is designed for 115-220V motors; always verify the technical datasheet of your compressor model to ensure the trip curve matches.

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.