36-10R3744 Rotom Run Capacitor for HVAC Motors, Restores Proper Motor-Run Support

Rotom 36-10R3744 is a dual-voltage, single-section motor-run capacitor rated at 10 MFD and 370/440 VAC. The round metal can measures approximately 1.65 inches in diameter and 2.78 inches in height. It is UL and cUL recognized and includes a built-in pressure interrupter.

Is This the Right Part?

This is a specification-based HVAC component. Compatibility is determined by the original capacitor and motor specifications — not by appliance model number. Confirm the original MFD rating, voltage, shape, diameter, can height, terminal type, and mounting clearance before ordering.

Compatible with motors requiring a single 10 MFD run capacitor rated at 370V or 440V, subject to physical and terminal fit.

Common Symptoms of a Defective Run Capacitor

• Motor hums but does not start
• Motor starts slowly or struggles under load
• Motor overheats or shuts down on thermal protection
• Reduced fan or blower speed
• Intermittent motor operation or higher-than-normal current draw

Check Before Replacing

• Test the original capacitor with a capacitance meter — confirm it is weak, open, or shorted before replacing
• Verify the original MFD rating is 10 MFD — the motor's specified capacitance must be matched exactly
• Confirm the original voltage rating — a 440V capacitor may replace a 370V capacitor of the same MFD; a 370V-only capacitor must not replace a 440V application
• Measure the original can diameter and height — confirm clamp diameter, cabinet clearance, terminal clearance, and wire reach
• Inspect wiring, terminals, and the motor itself for damage before installing a replacement

Round Direct Replacements — Same Electrical Rating

The following have the correct single-run, 10 MFD, 440V-capable electrical specification in a round can. Can dimensions vary by manufacturer — confirm physical fit before substituting.

Electrically Equivalent — Oval Can

The following match the required electrical rating but use an oval can. Do not substitute unless the equipment can accept an oval capacitor or the mounting bracket is changed.

Do Not Substitute

• Capacitors with a different MFD rating — increasing or decreasing capacitance increases motor temperature, current draw, and winding stress
• Dual-run capacitors unless correctly wired for the required section
• Start capacitors
• Electrolytic capacitors
• Capacitors rated below the equipment's required voltage
• A 10/5, 10/7.5, or 10/10 MFD dual capacitor without confirming the circuit and terminal arrangement
• A capacitor that cannot be mounted securely

Installation Notes

1. Disconnect electrical power and safely discharge the original capacitor before beginning service.
2. Photograph the original capacitor, wiring, and terminal positions before removal.
3. Compare the replacement with the original — confirm MFD, voltage, shape, diameter, height, and terminal type.
4. Inspect wiring, terminals, and the motor for damage before installing the replacement.
5. Restore power and test motor operation; check for unusual sounds, overheating, or error codes.

HVAC electrical diagnosis and installation should be completed by a qualified technician.

Verified Compatible Models

36-10R3744 is a specification-based HVAC component. There is no model-specific fitment list. Match the original capacitor specifications: Single run | 10 MFD | 370/440 VAC | Round | 1.65" diameter | 2.78" can height | Male quick-connect terminals.

Fitment reminder: Match the complete original capacitor specification — MFD, voltage, shape, diameter, height, terminal type, and mounting clearance — before ordering.