House Parts [Lifetime Warranty] 4 Pole Contactor 40 Amp 120 VAC Coil | Pack of 2
Two 40 Amp 4-pole definite purpose contactors with 120 VAC coils.
Two 40 Amp 4-pole definite purpose contactors with 120 VAC coils.
Lifetime Warranty

[Lifetime Warranty] 4 Pole Contactor 40 Amp 120 VAC Coil | Pack of 2

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4 Pole Contactor 40 Amp 120 VAC Coil

Key Features

  • Electrical Rating: 40 Amp resistive load capacity
  • Coil Voltage: 120 VAC, 50/60 Hz
  • Configuration: 4 Pole, with 2 Normally Open (NO) and 2 Normally Closed (NC) contacts
  • Construction: Features corrosion-resistant silver alloy contacts and a durable, compact housing
  • Design: Straight-through wiring and industry-standard mounting base for easy installation

Replaces / Cross-Reference Part Numbers

  • Direct replacement for definite purpose contactors with matching electrical specifications
  • Commonly replaces models such as C25ENF440A and 42CF25AF

Compatibility & Fitment

  • Designed for use in residential and commercial applications
  • Suitable for HVAC systems, air conditioning units, heat pumps, and refrigeration systems
  • Also used for controlling motor loads and multi-circuit lighting

When to Replace

  • Loud buzzing, humming, or chattering noise during operation
  • Connected equipment fails to start or runs continuously
  • Visible signs of heat damage, melting, or arcing on the housing or contacts
  • Pitting or welding of the internal contacts, causing intermittent power
  • The coil is open or shorted, preventing the contactor from engaging

Installation Tips

  • Disconnect all electrical power to the unit before servicing
  • Verify the control circuit voltage matches the 120 VAC coil rating
  • Ensure all wire terminals are tightened securely to prevent loose connections and overheating
  • Mount the contactor on a clean, flat surface in the designated location
  • After installation, restore power and cycle the system to confirm proper operation
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  • Perfect fit

    Perfect fit

    Our Contactor can replace 3 pole contactors rated at 20A 25A 30A 35A 40A on air conditioners and heat pumps.
  • Premium quality

    Premium quality

    The Contactor is made of strong silver alloy which is oxidation resistant, high conductivity, and corrosion resistant.
  • Saving solution

    Saving solution

    Effortlessly energize your machine with our Contactor - BlueStars brings DIY solutions to help you deal with any trouble.
  • Simple installation

    Simple installation

    Our product is designed to be easily removed and replaced, allowing for quick and convenient maintenance.
ENJOY COMFORTABLE LIVING AND CHERISH ANY MOMENTS

ENJOY COMFORTABLE LIVING AND CHERISH ANY MOMENTS

BlueStars - #1 source of high-quality electrical parts
Poles
4
Current Rating (AC)
40A
Current Rating (Resistive)
50A
Coil Voltage
110/120V AC, 50/60Hz
Coil VA
67VA inrush / 15VA sealed
Contact Configuration
4Ɨ Normally Open (N.O.) main contacts
HP Rating
3 HP @ 120V (1-ph) | 7.5 HP @ 240V (1-ph) | 10 HP @ 240V (3-ph) | 20 HP @ 480/600V (3-ph)
Terminals
Double 1/4" Quick Connect (line) + Double 1/4" Quick Connect (coil)
Enclosure Type
Open (IP00)
Certification
UL Listed / CSA
Mounting Base
2-5/16" x 2" with four oblong holes (1-5/8" x 1-5/8" on center)
Dimensions (W x D x H)
77 x 95.8 x 77mm (3.0" x 3.77" x 3.0")
Item Weight
~1.08 lbs (~0.49 kg)

FAQ

This contactor is designed for heavy-duty electrical switching, commonly used in HVAC systems, pool pumps, lighting circuits, and industrial motor control. The 4-pole configuration allows you to switch four separate circuits or phases simultaneously with a single 120 VAC control signal.
Common signs of failure include a loud humming or buzzing noise during operation, visible pitting or carbon buildup on the contact points, or the unit failing to engage even when the 120V coil is energized. If your equipment is not starting despite the thermostat or controller calling for power, the internal coil may be burnt out or the contacts may be welded shut.
You will need a screwdriver (typically flathead or Phillips depending on your terminal screws), a pair of needle-nose pliers for wire management, and a multimeter to verify that power is disconnected before starting. The installation process usually takes 15 to 30 minutes for an experienced technician.
Always turn off the main power supply at the breaker box before touching any wiring. Use a multimeter to confirm that there is zero voltage across all terminals. Because this is a 120 VAC coil, ensure your control voltage matches the coil rating; applying the wrong voltage to the coil will cause immediate, permanent damage to the unit.
Inspect your wiring for signs of heat damage or loose connections. If the old contactor failed due to a short circuit or a seized motor, address the root cause of the high amperage draw first, otherwise, the new contactor may fail prematurely.