Danfoss 103N0011 Starting Device

When you're servicing fractional horsepower systems, the Danfoss 103N0011 starting device is the industry standard for ensuring consistent motor engagement. This PTC starting device (Positive Temperature Coefficient) is engineered to provide the necessary starting torque for hermetic compressors, specifically within the LST (Low Starting Torque) range. By utilizing advanced thermistor-based technology, the 103N0011 acts as a reliable compressor start relay, effectively managing the electrical path to the start winding and protecting against thermal overload during high-cycling demands. Unlike mechanical relays, this solid-state compressor starter has no moving parts to wear out, making it a critical component for long-term operational reliability in refrigeration and air conditioning applications. It is compatible with a wide array of Danfoss models, including the TL, FR, and NL series (such as TL2.5F, FR7.5G, and NL11F), providing a precise compressor replacement part fit that maintains OEM performance standards. Its compact, push-on design allows for rapid field installation, reducing downtime for your clients.

• Universal Compatibility: Fits a broad range of Danfoss and Secop compressors, including TL, NL, and FR series, simplifying truck stock management.
• Solid-State Reliability: The PTC thermistor design eliminates mechanical contact wear and arcing, ensuring a much higher cycle life than traditional magnetic relays.
• Thermal Protection: Inherently assists in preventing compressor motor overheating by regulating current flow to the start winding during the ignition phase.
• Easy Installation: Standard terminal configuration allows for a direct "plug-and-play" replacement on 220V-240V 50/60Hz systems.

What is the difference between this PTC device and a standard start relay?
The 103N0011 uses a PTC thermistor which increases resistance as it heats up, effectively "cutting out" the start winding once the motor is up to speed. This solid-state process is quieter and more reliable than mechanical contactors.

Can I use this on a system that requires a start capacitor?
This specific device is designed for LST (Low Starting Torque) applications. If your compressor requires high starting torque (HST) for expansion valve systems, ensure you are matching the specific Danfoss compressor wiring diagram or checking for compatibility with a start capacitor kit.

Is the 103N0011 compatible with 115V systems?
No, this unit is rated for 220-240V operations. Always verify the voltage rating on the compressor nameplate before installing to avoid component failure.

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.