Single Run Capacitor, Round, 40/440 uF

Performance-Grade Component – Mars 12745 Jard 40 µF 440V Round Run Capacitor

The Mars 12745 Jard Capacitor is a single-value, round-style run capacitor with a 40 microfarad (µF) rating at 440 VAC. Engineered for continuous duty in HVAC systems, it supports permanent split capacitor (PSC) motors used in compressors, condenser fans, and air handling units. Designed with metallized polypropylene film and a built-in UL-recognized pressure interrupter, it meets demanding performance and safety standards in the field.

Designed for HVAC System Integrity

Developed for both OEM replacement and general service use, the 12745 offers contractors a reliable option where consistent capacitance and thermal stability are essential. Its robust construction supports high-frequency cycling and stable operation over a broad ambient temperature range, including refrigeration and A/C applications operating in harsh environments.

Product Specifications

• Capacitance: 40 µF ±6%
• Rated Voltage: 440 VAC
• Frequency: 50/60 Hz
• Operating Temperature Range: -40°C to +70°C (-40°F to +158°F)
• Dimensions: 4-1/4" H × 1-3/4" D (nominal canister size)
• Enclosure: Round aluminum housing with dual quick-connect terminals
• Dielectric: Metallized polypropylene film
• Safety Interrupter: Internal pressure-sensitive switch (UL 810 compliant)

Installation Overview

Installation should be completed by a qualified HVAC technician to ensure electrical safety and code compliance. Capacitance and voltage values must match system requirements. Terminal orientation and polarity are critical—observe schematic markings and always discharge the old capacitor before removal. Avoid substitutions unless specifications are precisely matched.

Field Considerations for Professionals

• ✅ Non-PCB Dielectric – Environmentally compliant, self-healing polypropylene film construction
• ✅ Interrupter Protection – Built-in mechanism isolates failed capacitors to prevent rupture or circuit damage
• ✅ Single-Value Application – Ideal for fan motors and single-phase compressors in residential and light commercial systems
• ✅ Standard Form Factor – Compatible with a wide range of brackets and enclosures for simplified service work

Usage and Service Notes

The Mars 12745 is well-suited for replacement work where a 40 µF, 440V run capacitor is specified. Periodic capacitor failure testing is recommended as part of preventive maintenance schedules in high-cycle HVAC systems. Only capacitors with identical ratings should be used in replacement applications unless otherwise approved by equipment manufacturers.