Run Start Capacitor, Round, 10/5 MFD, 440/370

Mars 12811 – Dual Motor Run Capacitor for Light-Duty HVAC Applications

The Mars 12811 is a dual motor run capacitor engineered to provide continuous electrical support in systems operating permanent split capacitor (PSC) motors. With a capacitance rating of 10/5 microfarads (MFD) at 440V AC, it is suitable for use in residential and light commercial HVAC units requiring compact dual-capacitance components for both compressor and fan motor circuits.

This capacitor is designed for high-cycle environments and is housed in a round aluminum case, providing stable dielectric performance and improved longevity under thermal and electrical stress. It is appropriate for scheduled maintenance, OEM-equivalent replacements, and performance-critical installations where voltage stability is essential.

Application-Specific Design Attributes

• ✅ Dual Capacitance Functionality – Supports two independent motor windings in one enclosure, reducing component footprint.
• ✅ 440V AC Voltage Rating – Designed to endure elevated line voltage conditions and resist voltage degradation.
• ✅ Dielectric Integrity – Internal construction supports sustained capacitance values through extended duty cycles.
• ✅ Compact Form Factor – Round configuration facilitates use in constrained electrical enclosures or service panels.

Technical Specifications

• Model: Mars 12811
• Capacitance: 10/5 MFD (Microfarads)
• Voltage Rating: 440V AC
• Type: Dual Motor Run Capacitor
• Shape: Round

Installation Guidelines

Capacitor replacement or installation must be performed by qualified HVAC technicians. Ensure all power sources are disconnected, discharge existing capacitors safely, and validate compatibility by comparing MFD and voltage ratings with the original equipment. Use only approved tools and PPE to reduce risk during handling and electrical connection.

• ???? Standard nut driver or screwdriver for mounting
• ???? Multimeter or capacitance tester for validation
• ???? PPE: Safety gloves, eye protection, and lockout/tagout protocol adherence

Capacitor must be securely mounted to prevent vibration, and terminal connections should be confirmed for fit and contact integrity before system re-energization.

Operational Role in Field Applications

The Mars 12811 capacitor is suitable for service replacements in air handlers, condensing units, and fan coil systems where dual-capacitance is required for efficient split-phase motor function. It meets industry-standard tolerance ranges and offers consistent capacitance delivery in accordance with manufacturer specs.

Component Highlights

• ✅ Low MFD Range – Suitable for fan motors and fractional-horsepower compressor circuits requiring moderate phase shift support.
• ✅ Hermetically Sealed Aluminum Housing – Provides mechanical strength and environmental resistance.
• ✅ Field-Proven Reliability – Designed for dependable use in maintenance routines and retrofit projects.
• ✅ Installation Flexibility – Easily integrates into systems with round capacitor brackets and standard spade terminals.

Capacitor for Targeted HVAC Motor Control

The Mars 12811 delivers targeted support for low-capacitance HVAC motor circuits. Its compact design, dual-functionality, and high-voltage rating make it a practical option for professionals managing day-to-day service calls or executing planned system upgrades. Built to withstand the operational rigors of modern equipment, this component supports efficient motor performance and long-term reliability in HVAC applications.