MARS 12937 Run Capacitor
The MARS 12937 Run Capacitor is a contractor-grade 20 MFD 440Vac Oval Run Capacitor designed for continuous-duty motor applications in residential and light commercial HVACR equipment. Engineered specifically for permanent split capacitor (PSC) motors, this component ensures stable microfarad performance and voltage endurance for condenser fan motors and blower assemblies. The MARS 12937 features an oil-filled, hermetically sealed aluminum case with a non-PCB construction, providing a safe and environmentally friendly solution for field replacements. Its oval 20 microfarad capacitor profile is ideal for installations with limited clearance where round alternatives cannot be used. This unit includes an integrated pressure-sensitive interrupter compliant with UL 810 standards, designed to disconnect the capacitor in the event of internal pressure buildup. With a wide operating temperature range of -40°C to +70°C and a ±6% capacitance tolerance, this 440 volt HVAC run capacitor maintains system efficiency and prevents the "hard starting" issues that lead to premature compressor failure.
Key Benefits- Enhanced Motor Efficiency: Maintains the necessary phase shift to keep PSC motors running at peak performance and lower amperage.
- Superior Safety Construction: Features a physical interrupter and a rugged, leak-proof aluminum housing for reliable service in high-heat environments.
- Universal Compatibility: The 440V rating allows this unit to replace 370V and 440V oval capacitors, offering greater versatility for service truck stock.
- Compact Oval Design: Precision-fit dimensions (approximately 4-inch height) allow for easy installation in tight electrical control boxes.
Can I use a 440V capacitor to replace a 370V unit?
Yes. You can always increase the voltage rating when replacing a capacitor, as the 440V rating indicates the maximum peak voltage the component can handle. However, you must never use a lower voltage rating than the original equipment manufacturer (OEM) specification.
Does the microfarad (MFD) rating have to be exact?
Yes. While voltage can be higher, the capacitance must match the's motor requirements. Using a 20 uF capacitor where a different rating is specified can cause the motor to overheat, draw excess current, and eventually burn out the windings.
How do I know if this run capacitor has failed?
Common signs of failure include a bulging or "swollen" top, oily residue leaking from the terminals, or a humming sound from the motor without the fan blades spinning. A multimeter with a capacitance setting is required to confirm the MFD output is within the ±6% tolerance.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
MARS 12937 Run Capacitor
The MARS 12937 Run Capacitor is a contractor-grade 20 MFD 440Vac Oval Run Capacitor designed for continuous-duty motor applications in residential and light commercial HVACR equipment. Engineered specifically for permanent split capacitor (PSC) motors, this component ensures stable microfarad performance and voltage endurance for condenser fan motors and blower assemblies. The MARS 12937 features an oil-filled, hermetically sealed aluminum case with a non-PCB construction, providing a safe and environmentally friendly solution for field replacements. Its oval 20 microfarad capacitor profile is ideal for installations with limited clearance where round alternatives cannot be used. This unit includes an integrated pressure-sensitive interrupter compliant with UL 810 standards, designed to disconnect the capacitor in the event of internal pressure buildup. With a wide operating temperature range of -40°C to +70°C and a ±6% capacitance tolerance, this 440 volt HVAC run capacitor maintains system efficiency and prevents the "hard starting" issues that lead to premature compressor failure.
Key Benefits- Enhanced Motor Efficiency: Maintains the necessary phase shift to keep PSC motors running at peak performance and lower amperage.
- Superior Safety Construction: Features a physical interrupter and a rugged, leak-proof aluminum housing for reliable service in high-heat environments.
- Universal Compatibility: The 440V rating allows this unit to replace 370V and 440V oval capacitors, offering greater versatility for service truck stock.
- Compact Oval Design: Precision-fit dimensions (approximately 4-inch height) allow for easy installation in tight electrical control boxes.
Can I use a 440V capacitor to replace a 370V unit?
Yes. You can always increase the voltage rating when replacing a capacitor, as the 440V rating indicates the maximum peak voltage the component can handle. However, you must never use a lower voltage rating than the original equipment manufacturer (OEM) specification.
Does the microfarad (MFD) rating have to be exact?
Yes. While voltage can be higher, the capacitance must match the's motor requirements. Using a 20 uF capacitor where a different rating is specified can cause the motor to overheat, draw excess current, and eventually burn out the windings.
How do I know if this run capacitor has failed?
Common signs of failure include a bulging or "swollen" top, oily residue leaking from the terminals, or a humming sound from the motor without the fan blades spinning. A multimeter with a capacitance setting is required to confirm the MFD output is within the ±6% tolerance.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The MARS 12937 Run Capacitor is a contractor-grade 20 MFD 440Vac Oval Run Capacitor designed for continuous-duty motor applications in residential and light commercial HVACR equipment. Engineered specifically for permanent split capacitor (PSC) motors, this component ensures stable microfarad performance and voltage endurance for condenser fan motors and blower assemblies. The MARS 12937 features an oil-filled, hermetically sealed aluminum case with a non-PCB construction, providing a safe and environmentally friendly solution for field replacements. Its oval 20 microfarad capacitor profile is ideal for installations with limited clearance where round alternatives cannot be used. This unit includes an integrated pressure-sensitive interrupter compliant with UL 810 standards, designed to disconnect the capacitor in the event of internal pressure buildup. With a wide operating temperature range of -40°C to +70°C and a ±6% capacitance tolerance, this 440 volt HVAC run capacitor maintains system efficiency and prevents the "hard starting" issues that lead to premature compressor failure.
Key Benefits- Enhanced Motor Efficiency: Maintains the necessary phase shift to keep PSC motors running at peak performance and lower amperage.
- Superior Safety Construction: Features a physical interrupter and a rugged, leak-proof aluminum housing for reliable service in high-heat environments.
- Universal Compatibility: The 440V rating allows this unit to replace 370V and 440V oval capacitors, offering greater versatility for service truck stock.
- Compact Oval Design: Precision-fit dimensions (approximately 4-inch height) allow for easy installation in tight electrical control boxes.
Can I use a 440V capacitor to replace a 370V unit?
Yes. You can always increase the voltage rating when replacing a capacitor, as the 440V rating indicates the maximum peak voltage the component can handle. However, you must never use a lower voltage rating than the original equipment manufacturer (OEM) specification.
Does the microfarad (MFD) rating have to be exact?
Yes. While voltage can be higher, the capacitance must match the's motor requirements. Using a 20 uF capacitor where a different rating is specified can cause the motor to overheat, draw excess current, and eventually burn out the windings.
How do I know if this run capacitor has failed?
Common signs of failure include a bulging or "swollen" top, oily residue leaking from the terminals, or a humming sound from the motor without the fan blades spinning. A multimeter with a capacitance setting is required to confirm the MFD output is within the ±6% tolerance.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
