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Silver cylindrical capacitor with four blade terminals on top

SUPCO

SUPCO CD40+3X440R HVAC Control 40+3 MFD 440/370 VAC

SKU CH-3DAA-ASEV7 MPN CD40

Round dual-run capacitor rated 40+3 MFD at 440/370 VAC for air-conditioning and refrigeration compressors

  • Voltage440
  • Item Count1
  • Dual 40+3 MFD rating powers compressor and fan motors
  • 440/370 VAC rating handles high-voltage HVAC systems reliably
  • UL and VDE agency approvals confirm safety compliance
  • 40 to 185 °F operating range suits extreme ambient conditions
  • Steel case with physical interrupter protects against internal failure

Dual-run capacitor for HVAC motors

The Supco CD40+3X440R is a round dual-run capacitor rated at 40 + 3 MFD and 440/370 VAC. It serves air-conditioning compressors, refrigeration compressors, furnace blower motors and condenser fan motors. The drawn steel case measures 2.00" x 4.125" and uses quad-blade quick-connect terminals. Agency listings include UL and VDE.

Check voltage, capacitance

Verify that the existing motor nameplate calls for 40 + 3 MFD at 440/370 VAC and that the round case dimensions fit the mounting bracket. Confirm the operating temperature range of -40 to 185 degrees F (-40 to 85 C) matches the installation environment. Ensure the quad-blade terminals match the wiring harness and that the physical interrupter safety feature is acceptable for the application.

Suits technicians replacing PRCFD403 or 12978 units

This capacitor suits HVAC technicians and maintenance staff who need a direct replacement for Packard PRCFD403 or Mars 12978 parts. It is not for systems requiring a different capacitance value, a higher voltage rating, an oval case style or screw-terminal connections. Buyers needing single-run capacitors or non-standard tolerances should look at other components.

Highlights

  • Dual 40+3 MFD rating powers compressor and fan motors
  • 440/370 VAC rating handles high-voltage HVAC systems reliably
  • UL and VDE agency approvals confirm safety compliance
  • 40 to 185 °F operating range suits extreme ambient conditions
  • Steel case with physical interrupter protects against internal failure

Specifications

BrandSupco
ModelCD40+3X440R
Voltage440
Item Count1

Questions about this item

What comes in the box with the CD40+3X440R and what must be purchased separately?

The package contains one round dual run capacitor with quad-blade quick-connect terminals. Mounting hardware, wiring and any required contactor or relay are not included and must be sourced separately.

Should I choose the 440 VAC or 370 VAC rating for my system?

The capacitor is rated for both 440 VAC and 370 VAC; select the voltage that matches or exceeds the compressor or motor nameplate voltage in your equipment.

What does the 40+3 MFD rating mean once the capacitor is installed in a compressor circuit?

It provides 40 microfarads for the compressor start/run winding and 3 microfarads for the condenser fan motor, with a ±5 % tolerance, operating from -40 °F to 185 °F.

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