2P40A24V – CONTACTOR (C240A)
SKU · C240A
$30.61
Two-pole 40A contactor with 24V coil (C240A). The most common residential AC contactor. Controls power to the compressor in your outdoor unit.
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CONTACTOR1P32A24V – CONTACTOR (SCREW TERMINALS)
SKU · 42-109499-24$30.70Rheem 42-109499-24 single-pole 32A contactor with 24V coil and screw terminals. OEM replacement for Rheem and Ruud AC condensers.
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CONTACTOR3P40A120V – CONTACTOR (3 POLE, 40 RLA, 120V COIL)
SKU · DP401203$35.95Three-pole 40A contactor with 120V coil (C340B/DP401203). For 3-phase AC and commercial HVAC applications. Silver cadmium oxide contacts by Supco.
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CONTACTOR3P40A24V – CONTACTOR (3 POLE, 40 RLA, 24V COIL)
SKU · DP40243$39.43Three-pole 40A contactor with 24V coil (C340A/DP40243). For 3-phase commercial AC and refrigeration. Silver cadmium oxide contacts by Supco.
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CONTACTOR2P40A240V – CONTACTOR (C240C)
SKU · C240C$35.61Two-pole 40A contactor with 240V coil (C240C). Controls power to the compressor in commercial or specialty AC systems. For 240V control circuits only.
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CONTACTOR1P40A24V – CONTACTOR (C140A)
SKU · C140A$29.50Single-pole 40A contactor with 24V coil (C140A). Controls power to the compressor in your outdoor AC unit. Direct replacement for most 1-pole 25-40A applications.
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CONTACTOR2P40A120V – CONTACTOR (C240B)
SKU · 2P40A120V$35.61Two-pole 40A contactor with 120V coil (C240B). Controls power to the compressor in commercial or specialty AC systems. For 120V control circuits only.
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In Stock
CONTACTOR3P40A240V – CONTACTOR (3 POLE, 40 RLA, 240V COIL)
SKU · C340C$39.43Three-pole 40A contactor with 240V coil (C340C/DP402403). For 3-phase AC and commercial HVAC applications. Silver cadmium oxide contacts by Supco.
Signs You May Need a New Contactor
The contactor is an electrically controlled switch inside your outdoor AC unit. It engages when the thermostat calls for cooling, sending power to the compressor and fan motor.
Outdoor Unit Won't Turn On▼
- Thermostat calls for cooling but the outdoor condenser does nothing.
- The indoor blower may still run normally.
- A stuck-open contactor prevents power from reaching the compressor and fan.
AC Won't Turn Off▼
- The outdoor unit keeps running even after the thermostat is satisfied.
- The contactor may be welded or stuck in the closed position.
- This wastes electricity and can damage the compressor over time.
A stuck-closed contactor is a safety concern — the system runs continuously and can overheat.
Chattering, Clicking, or Buzzing Noise▼
- Rapid clicking or chattering sounds from the outdoor unit.
- A buzzing noise when the AC tries to start but fails.
- Worn or pitted contact points can't hold a solid electrical connection.
Intermittent Cooling▼
- AC works sometimes but not consistently.
- The contactor may engage and disengage unpredictably.
- Pitted contacts create resistance that causes unreliable operation.
Visible Burning or Pitting on Contact Points▼
- Burned, blackened, or melted contact surfaces inside the contactor.
- Corrosion or debris preventing proper electrical contact.
- Ant infestations inside the contactor (very common in Texas) can cause arcing and failure.
Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement.
📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
🎥 Watch our video tutorial: How to Test & Replace an AC Contactor