Rotom Run Capacitor 36-55R3744, Round, 55MFD, 370/440V
Rotom Run Capacitor 36-55R3744, Round, 55MFD, 370/440V
Rotom Run Capacitor 36-55R3744, Round, 55MFD, 370/440V
Rotom Run Capacitor 36-55R3744, Round, 55MFD, 370/440V

Rotom HVAC Run Capacitor 36-55R3744 — Round, 55MFD, 370/440V

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SPECIAL ORDER — OEM REPLACEMENT PART

Rotom HVAC Run Capacitor 36-55R3744 — Round, 55MFD, 370/440V

Part# 36-55R3744 55 µF 370/440 VAC Round — 2.17” × 5.12” (55 × 130 mm) Single Run Ships 3–5 Business Days UL & cUL Recognized

HVAC Motor Not Starting? Run Capacitor 36-55R3744 — Fixes Weak Motor Starting / Restores 55MFD Run Capacitance

If your HVAC motor hums but won’t start, runs weakly, or draws excessive current, a failed run capacitor is one of the most common causes. In PSC (permanent split capacitor) motors, the run capacitor provides continuous phase-shift support while the motor is operating. When it fails, the motor loses efficiency, struggles to start, or stops running entirely. ⚡ Common failure point in condenser fan motors, blower motors, and compressor circuits. Part 36-55R3744 is the Rotom OEM replacement that restores proper run capacitance to compatible 55MFD PSC motor circuits.

🇺🇸 Matching U.S. Part Number: 36-55R3744

📦 Special Order This Part — Ships in 3–5 business days. Tracking sent once your order ships.

❓ Is This the Right Part?

This is the correct fix if ALL of the following are true:

  • ✔ Motor circuit is confirmed to require a single 55MFD run capacitor (not a dual-run capacitor)
  • ✔ Electrical supply to the unit is confirmed OK
  • ✔ Motor windings are not open or shorted
  • ✔ ONLY problem is the motor failing to start, humming, or running below rated speed

Not sure? Send us your model number — we’ll confirm before you order.

🔧 Common Symptoms

  • Motor hums but won’t start or start is sluggish
  • Fan or blower runs at reduced speed
  • Motor overheats or trips thermal overload
  • Unit draws higher than normal current
  • Capacitor is visibly bulged, leaking, or measures out of spec

✔ If these symptoms match, this is the most likely failed component in the motor circuit.

✔ In most cases, replacing the run capacitor restores normal motor operation immediately.

📦 Part Details

  • Part Number: 36-55R3744
  • Type: Single motor-run capacitor (not a dual-run, not a start capacitor)
  • Capacitance: 55 µF
  • Voltage: 370/440 VAC
  • Shape: Round
  • Diameter: 2.17 in (55 mm)
  • Height: 5.12 in (130 mm)
  • Features: Heavy-duty compact construction; built-in pressure interrupter; UL and cUL recognized
  • Brand/OEM: Rotom / AllTemp
  • Availability: Special Order — Ships in 3–5 business days
  • Direct Round Equivalents: PPS55440RD, PRCF55, PRCF55A, TRCF55, CR55X440R, 12752, 14252, USA2218, CAP-55/440R
⚠️ Recommended While Repairing:
Inspect the motor windings and contactor at the same time. A capacitor that has failed due to age or heat stress often indicates the motor itself is approaching end of life. Confirming motor condition during the same service call prevents a repeat failure.

⚙️ Installation

Skill Level: Moderate — 20 to 45 minutes. Disconnect and lock out power to the unit before opening the electrical compartment. Capacitors retain a hazardous charge after power is removed — discharge safely before handling. Match the terminal connections exactly to the original wiring. Confirm mounting strap diameter and cabinet clearance before installing — dimensions vary between equivalent brands. Diagnosis and replacement should be completed by a qualified HVAC technician.

✓ Compatible Models

Compatibility for this capacitor is specification-based. Capacitance must remain exactly 55MFD, and the replacement voltage must equal or exceed the original equipment requirement. Confirm the round shape and dimensions (2.17” × 5.12”) fit the mounting strap and cabinet clearance before ordering. Contact us to verify your model number before ordering.

💡 Pro Tip

55MFD Is a Less Common Rating — Verify Before Ordering:
55MFD is less common than 45MFD or 60MFD. Capacitance must match exactly — a 50MFD or 60MFD capacitor is not a substitute. Note that two conflicting UPC candidates (777980034331 and 777980034317) appear in distributor records for this part — do not rely on barcode alone to confirm the correct item. The oval counterpart is 36-55-370440 — electrically identical but requires a different mounting strap. Always read the label on the old capacitor directly before ordering.

✅Compatibility & Cross Reference

Direct Round Equivalents (55MFD, 370/440V or 440V)

PPS55440RD — ProParts, 55MFD, 440V, round

PRCF55 — Packard, 55MFD, 440V-class, round

PRCF55A — Titan HD, 55MFD, 440V-class, round

TRCF55 — Titan Pro, 55MFD, 440/370V, round

CR55X440R — Supco, 55MFD, 440V, round

12752 — JARD/MARS, 55MFD, 440V-class, round

14252 — MARS USA, 55MFD, 440V-class, round

USA2218 — AmRad, 55MFD, 370/440V, round

CAP-55/440R — 55MFD, 440V-class, round

Electrical ratings and round shape match, but dimensions vary. Confirm mounting-strap diameter, available height and terminal clearance before ordering.

Electrically Equivalent — Oval Case

These are 55MFD, 440V or 370/440V oval run capacitors. They are electrically compatible but are not mechanical drop-in replacements for the original round bracket. A different mounting strap may be required.

36-55-370440 — Rotom, 55MFD, 370/440V, oval

POCF55 — Packard, 55MFD, 440V-class, oval

POCF55A — Titan HD, 55MFD, 440V-class, oval

TOCF55 — Titan Pro, 55MFD, 440/370V, oval

45550H — DiversiTech, 55MFD, 440V, oval

CR55X440 — Supco, 55MFD, 440V, oval

LCR55X440 — Supco Linebacker, 55MFD, 440V, oval

12050 — MARS Blue Box, 55MFD, 440V-class, oval

12950 — JARD/MARS, 55MFD, 440V-class, oval

14050 — MARS USA, 55MFD, 440V-class, oval

Conditional 370V-Only Replacements

Use only where equipment originally specifies 370V. A 440V or 370/440V capacitor may replace a 370V capacitor when capacitance remains exactly 55MFD. Never install a 370V-only capacitor where 440V is required.

PRC55 — Packard, 55MFD, 370V, round

PRC55A — Packard, 55MFD, 370V, round

TRC55 — Titan Pro, 55MFD, 370V, round

CR55X370R — Supco, 55MFD, 370V, round

12226 — MARS Blue Box, 55MFD, 370V, round

12726 — JARD/MARS, 55MFD, 370V, round

14226 — MARS USA, 55MFD, 370V, round

C355R — Genteq/Capcom, 55MFD, 370V, round

POC55 — Packard, 55MFD, 370V, oval

TOC55 — Titan Pro, 55MFD, 370V, oval

CR55X370 — Supco, 55MFD, 370V, oval

12024 — MARS Blue Box, 55MFD, 370V, oval

12924 — JARD/MARS, 55MFD, 370V, oval

14024 — MARS USA, 55MFD, 370V, oval

C355L — Genteq/Capcom, 55MFD, 370V, oval

Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.

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