1P40A24V – CONTACTOR (C140A)

If your AC clicks but doesn’t start, or the outdoor unit won’t turn on at all, the contactor is the first thing to check. The contactor is the electrical switch inside your outdoor unit that sends power to the compressor when the thermostat calls for cooling. This single-pole 40A model with a 24V coil fits most residential systems.

Replaces: C140A, 1P40A24V, CONT1P025024V, CONT1P030024V, CONT2P025024VS, SE6968M

Fits: Goodman: GSX140481KD; also fits most residential AC systems requiring a 1-pole 25-40A contactor with 24V coil

Need help? See our AC Clicking But Not Starting Guide.

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• Poles1
• Amps40 RLA (full load)
• Coil Voltage24V AC
• TerminalsScrew + push-on quick-connect
• Operating Temp-40°F to 158°F
• UL ListedYes

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 1P40A24V
• 42-20619-01
• 42-25035-01
• 42-25101-03
• 42-42478
• 42-42478-02
• C147094P02
• CONT1P025024V
• CONT1P030024V
• CONT2P025024VS
• CONTACTOR
• CTR02574
• DP1040A5004
• GSX140481KD
• H140A
• SE6968M

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• Rheem / Ruud RA13, RA14, RA16 series condensers
• Goodman / Amana / Daikin GSX13, GSX14, GSX16 series
• Trane XR13, XR14, XB13, XB14 (verify nameplate)
• Carrier / Bryant / Payne 13-14-16 SEER
• Lennox 13ACX, 14ACX, ML14XC1 series
• York / Coleman entry-level residential condensers
• Standard residential 24V control circuit (most split-system AC and heat pumps)
• Verify amp rating + coil voltage on the existing contactor before swapping

How do I know if my contactor is bad?

Pitted or burned contacts, a buzzing sound when the AC tries to start, or the contactor sticking closed (AC runs constantly, never cycles off). Pull the front cover and look at the contacts — if they're black or pitted, replace it.

Can I use a higher amp rating?

Yes. Going up in amps is fine (40A replacing a 30A is safe). Coil voltage MUST match exactly — 24V coil only goes in 24V circuits.

2-pole vs 3-pole — which do I need?

Count the thick wires hitting the line side (top). 2 fat wires = 2-pole (residential split-system). 3 fat wires = 3-pole (3-phase commercial). Most residential is 2-pole.

How long does a contactor last?

5-10 years typical. Insects, dust, and short-cycling shorten the life. If you find ants or wasps nesting in your condenser, that often kills contactors fast.