3 Pole 40 Amp Contactor 120V Coil DP Contactor HVAC Contactor - 42CF35AF Equivalent
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3 Pole 40 Amp Contactor 120V Coil DP Contactor HVAC Contactor - 42CF35AF Equivalent

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3 Pole 40 Amp Contactor 120V Coil DP Contactor HVAC Contactor - 42CF35AF Equivalent

Key Features

  • Poles: 3 Pole, Normally Open (NO)
  • Amperage Rating: 40 Ampere (A) Full Load Amps (FLA)
  • Coil Voltage: 110/120 Volts AC (VAC)
  • Frequency: 50/60 Hertz (Hz)
  • Maximum Voltage: 600 VAC
  • Contacts: Silver alloy composition
  • Terminals: Lug style for secure connections
  • Housing: Durable, high-impact plastic construction
  • Certification: UL Listed

Replaces / Cross-Reference Part Numbers

  • Serves as a universal replacement for definite purpose contactors with matching electrical specifications.
  • Suitable for replacing 20A, 25A, 30A, 35A, and 40A 3-pole contactors where the application load does not exceed 40A.

Compatibility & Fitment

  • Designed for commercial and residential applications.
  • Commonly used in HVAC systems, including air conditioners and heat pumps.
  • Suitable for refrigeration units, motor loads, and lighting control systems.

When to Replace

  • Visible signs of physical damage, such as burnt contacts, pitting, or a melted housing.
  • Audible buzzing, humming, or chattering from the contactor during operation.
  • The controlled equipment fails to start (contactor not closing) or will not shut off (contactor welded shut).
  • Intermittent or unreliable operation of the system.
  • The coil is open or shorted, preventing the contactor from energizing.

Installation Tips

  • Disconnect all power to the unit before beginning installation or service.
  • Verify that the control circuit voltage matches the contactor's 120 VAC coil rating.
  • Ensure all electrical connections are tightened securely to the lug terminals to prevent overheating.
  • Mount the contactor securely on a clean, flat surface.
  • Professional installation by a qualified technician is recommended.
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  • Perfect fit

    Perfect fit

    Our Contactor can replace 3 pole contactors rated at 20A 25A 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
3
Current Rating (AC)
40A
Current Rating (DC)
30A @ 24V DC
Max Voltage
600V
Coil Voltage
110/120V AC
Coil VA
67VA inrush / 15VA sealed
Contact Configuration
3Γ— Normally Open (N.O.) main contacts
Max HP Rating
2 HP @ 115V (1-phase) | 10 HP @ 230V | 15 HP @ 480V (3-phase)
Enclosure Type
Open (IP00)
Frequency
50/60Hz
Certification
UL Listed / CSA C22.2
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 (~0.55 kg)

FAQ

A failing contactor often produces a loud humming or buzzing noise while energized. You may also notice the equipment failing to start despite the thermostat calling for cooling or heating, or the unit running continuously even after the cycle should have ended. If you see signs of pitting, burnt contact points, or a stuck plunger, the contactor should be replaced immediately.
Definite Purpose (DP) contactors are specifically engineered for high-cycle applications such as HVAC, refrigeration, and pump systems. Unlike general-purpose contactors, these are designed to handle the frequent electrical surges and rapid cycling inherent in motor-starting applications.
Installation typically requires a flat-head screwdriver for terminal screws, a Phillips-head screwdriver for mounting screws, and a multimeter to verify voltage levels before and after installation. Ensure the power is completely disconnected at the breaker before beginning work.
Before installation, inspect your wiring for signs of heat damage or melted insulation, which can occur if the previous contactor was failing. It is also good practice to check your capacitor; a weak or failing capacitor can put unnecessary strain on the contactor, leading to premature failure of the new unit.
The 120 VAC coil rating refers to the control voltage required to pull the contactor closed. Ensure your control circuit provides 120 volts. If your system uses a 24 VAC control circuit, this contactor will not function correctly and may cause damage to your control transformer.