Schneider Electric (Barber Colman) AT-520-40 Knob Kit

The Schneider Electric (Barber Colman) AT-520-40 Knob Kit is a critical replacement component for field technicians managing pneumatic control systems and legacy HVAC automation hardware. This setpoint knob kit is specifically engineered to provide a precision fit for Barber Colman TK Series thermostats, ensuring accurate calibration and tactile adjustment of space temperature setpoints. Built from high-impact, industrial-grade plastic, the AT-520-40 is designed to withstand the rigors of high-traffic commercial environments while maintaining a secure interface with the internal adjustment post. As an OEM replacement part, it guarantees seamless thermostat compatibility, allowing contractors to restore full functionality to existing controls without the need for extensive system recalibration or full unit replacement. Utilizing this Schneider Electric accessory ensures that your environmental control system remains compliant with original manufacturer specifications for performance and reliability.

• Direct OEM Compatibility: Specifically designed for Barber Colman TK-1001 through TK-1601 series pneumatic thermostats.
• Durable Construction: Manufactured from robust materials to prevent cracking or stripping during frequent setpoint adjustments.
• Restored Accuracy: Eliminates setpoint drift caused by loose or damaged knobs, ensuring the pneumatic controller responds to precise user inputs.
• Rapid Field Installation: Simple press-fit design allows for immediate replacement, minimizing time spent on-site during service calls.

Which thermostat models are compatible with the AT-520-40?

This kit is the standard replacement for the Barber Colman TK-1000 and TK-1100 series pneumatic wall thermostats, as well as several other legacy Schneider Electric setpoint interfaces.

Does this kit include the setpoint scale?

The AT-520-40 specifically includes the adjustment knob; if the setpoint scale (APNT series) is damaged, it may need to be sourced separately depending on the specific HVAC control application.

Is this knob resistant to industrial cleaners?

Yes, the high-quality plastic construction is designed to resist common commercial cleaning agents typically used in facility maintenance.

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.