MARS 61480 Contactor

The MARS 61480 is a heavy-duty 3-pole definite purpose contactor engineered for industrial and commercial HVACR applications requiring high-amperage switching. Designed to manage 75 FLA (Full Load Amps) with a 94 amp non-inductive rating, this contactor provides reliable control for compressors and motors across refrigeration and air conditioning systems. The 24V coil operates with a 50/60 Hz frequency, featuring Class F insulation to withstand high-temperature environments. For enhanced component longevity, the silver cadmium oxide contacts are built to resist pitting and welding during inductive load switching. The enclosed body design minimizes dust intrusion and mechanical noise, while the universal mounting footprint ensures straightforward field replacement of legacy 42 Series or Centurion 2000 units. Integrated box lug terminals accommodate 1/10 AWG wiring, ensuring high-torque connections for maximum electrical conductivity and safety in high-stress circuits.

Key Benefits

• High Current Capacity: Rated for 75A inductive and 94A resistive loads, making it ideal for large commercial condenser units.
• Extended Contact Life: Silver cadmium oxide contacts improve durability when switching heavy inductive motor loads.
• Quiet Operation: The enclosed housing reduces electromagnetic "chatter" and keeps internal components clear of debris.
• Broad Compatibility: Footprint-compatible with most HVAC contactor brands and accepts MARS 780 or Furnas auxiliary switches.
• Severe Duty Rating: Features a 450A locked rotor rating at 240V for high-demand start-up cycles.

Common Questions

What are the symptoms of a failing 75 amp contactor?
Technicians often identify failure through audible chattering, humming from a burnt 24V coil, or visible pitting or "welding" of the silver contacts. If the compressor fails to engage despite a call for cooling, verify the coil resistance and 24VAC signal at the terminals.

Can I replace a 2-pole contactor with this 3-pole MARS 61480?
While you can technically use a 3-pole contactor in place of a 2-pole unit by utilizing only two of the poles, you must ensure the amperage rating (75A) meets or exceeds the original equipment manufacturer (OEM) specifications and that the 24V coil voltage matches the control circuit.

What wire size is required for the box lug terminals?
The lugs on the 61480 are designed to securely terminate wire sizes ranging from 1 to 10 AWG, ensuring a low-resistance connection for high-current applications.

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.