Eaton Cutler-Hammer CN15NN3A Contactor

The Eaton Cutler-Hammer CN15NN3A is a heavy-duty NEMA Size 4 contactor designed for high-demand motor control systems and industrial HVACR mechanical assemblies. This three-pole non-reversing contactor features a continuous current rating of 135 amps and is engineered for reliable full voltage switching of three-phase loads up to 600VAC. The 110/120V 50/60Hz coil facilitates seamless integration into standard control circuits, while the open type enclosure is ideal for mounting within specialized industrial panels or motor control centers (MCCs).

As part of the Freedom Series, the CN15NN3A utilizes silver cadmium oxide contacts to provide superior conductivity and resistance to arc erosion during frequent cycling. This unit includes one normally open (1NO) auxiliary contact for feedback or signaling in complex automation logic. Designed for a mechanical lifespan of up to 20 million operations, it ensures long-term performance in heavy-duty industrial HVACR applications where downtime is not an option. Techs can rely on the captive, self-lifting pressure plates at the terminals to reduce field wiring time and improve connection integrity.

Key Benefits

• NEMA Size 4 Rated: Built for rugged industrial environments, supporting up to 100 HP at 480V for demanding motor loads.
• Dual Frequency Coil: The 110/120Vac 50/60Hz coil voltage offers flexibility for varying power supply frequencies across diverse job sites.
• Enhanced Durability: Incorporates the Eaton Freedom Series contact design, known for minimizing welding and preventing phase-to-phase shorts.
• Space-Efficient Design: The non-reversing contactor architecture allows for high-density mounting in upright control panels.
• Versatile Compatibility: Seamlessly pairs with C306 or C440 overload relays to provide comprehensive thermal protection for three-phase equipment.

Common Questions

What are the horsepower ratings for the CN15NN3A?
This 135-amp contactor is typically rated at 40 HP at 208V, 50 HP at 240V, and 100 HP at 480/600V for standard three-phase induction motors.

Can I add more auxiliary contacts to this NEMA Size 4 unit?
Yes, the CN15NN3A supports a full line of snap-on accessories, including top-mounted and side-mounted auxiliary contact blocks for additional signaling configurations.

How do I replace the coil in the CN15NN3A?
The magnet coil is top-located and features three terminals allowing for diagonal or top wiring. It can be accessed and replaced without fully removing the contactor from the mounting plate or changing the main power wiring layout.

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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.