MARS 61611 Auxiliary

The MARS 61611 is a professional-grade 1 N/C (Normally Closed) side-mounted auxiliary switch engineered for integration with 25-60 Amp definite purpose contactors. As a veteran-preferred HVAC contactor auxiliary switch, this component provides reliable feedback and interlocking for commercial refrigeration and air conditioning control circuits. This specific model is a direct replacement for Trane SWT1733, ensuring seamless mechanical compatibility without the need for enclosure modifications. Built for high-duty cycles, the MARS 780 series auxiliary contact handles pilot duty signaling and secondary logic functions, such as de-energizing crankcase heaters or triggering alarm circuits when the main contactor is engaged. The side-mount design allows for rapid "snap-on" installation, making it the standard auxiliary contact for 25-60A contactors in the field. Its totally enclosed construction protects the silver cadmium oxide contacts from environmental debris, ensuring consistent continuity for low-voltage monitoring systems and safety interlocks.

• Direct OEM Cross: Identical to Trane SWT1733, providing a precise fit for existing system layouts.
• High Current Rating: Optimized for use with 25A to 60A inductive loads in demanding HVACR applications.
• Snap-On Integration: Features a side-mounted configuration for fast, tool-free attachment to compatible contactors.
• Industrial Durability: Specifically designed for commercial refrigeration and HVAC equipment control logic.
• Signal Reliability: Provides consistent 1 N/C switching for remote monitoring and equipment status feedback.

Is the MARS 61611 compatible with 3-pole contactors?
Yes, this auxiliary switch is designed to mount on the side of standard 25A through 60A definite purpose contactors, including 1, 2, and 3-pole versions, provided they feature the mechanical side-mount slot.

Can I use the MARS 61611 to replace a Trane SWT1733?
Absolutely. The MARS 61611 and Trane SWT1733 are functionally and mechanically identical units, making them interchangeable for servicing Trane and American Standard equipment.

What is the primary function of a normally closed (N/C) auxiliary switch?
In HVACR systems, an N/C auxiliary contact is often used to control a crankcase heater. When the main contactor pulls in (energizing the compressor), the auxiliary contact opens to shut off the heater, preventing unnecessary energy consumption and heat buildup during operation.

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.