MARS 12928 Run Capacitor
The MARS 12928 Run Capacitor is a standard replacement for 4 microfarad single-phase motor applications. Rated at 440Vac, this oval run capacitor is dual-rated, making it a reliable swap for 370V systems while offering increased dielectric strength for high-demand furnace blowers and condenser fan motors. As a tech, you know that keeping the induction motor within its specified 5% to 6% tolerance is critical for maintaining proper torque and preventing winding overheating. The Jard 12928 features a non-PCB, oil-filled design housed in a corrosion-resistant aluminum casing, engineered for continuous duty in temperatures ranging from -40°C to 70°C.
When you're out on a service call dealing with a motor that won't start or is pulling high amps, the 12928 MARS provides the necessary phase shift to keep the rotor in sync. Its compact oval case style and standard 1/4-inch male spade terminals ensure it fits into tight electrical cabinets where round capacitors might struggle. This is a go-to HVAC motor run capacitor for residential and light commercial air handlers and ventilation equipment.
Key Benefits
- 4 MFD 440V Dual Rating: Provides superior voltage protection and is compatible with both 370V and 440V HVAC capacitor replacement requirements.
- Technical Reliability: Meets EIA-456-A standards with an internal pressure interrupter for safety during end-of-life fault conditions.
- Environmental Resilience: Features a leak-proof aluminum construction and a wide operating temperature range for outdoor condensing units.
- Compact Integration: The oval run capacitor footprint is specifically designed for OEM mounting brackets in restricted spaces.
Common Questions
Can I use a 440V capacitor if the old one was 370V?
Yes. You can always go up in voltage rating (e.g., replacing a 370Vac with a 440Vac), but never down. Using the MARS 12928 440V rating actually provides a higher safety margin for the motor windings.
Does it matter which wire goes to which terminal on a single-run capacitor?
On a single-section capacitor like this one, there is no inherent polarity; however, standard practice is to connect the line side to the terminal marked with a dashed line or "identified" terminal if present, though functional performance remains identical either way.
What are the signs that my 4 MFD capacitor has failed?
Watch for a "bulged" top, leaking oil, or a motor that hums without turning. Always verify with a multimeter—if the reading is more than 6% away from 4 microfarads, it is time for a replacement.
This item is not eligible for free shipping.
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 12928 Run Capacitor
The MARS 12928 Run Capacitor is a standard replacement for 4 microfarad single-phase motor applications. Rated at 440Vac, this oval run capacitor is dual-rated, making it a reliable swap for 370V systems while offering increased dielectric strength for high-demand furnace blowers and condenser fan motors. As a tech, you know that keeping the induction motor within its specified 5% to 6% tolerance is critical for maintaining proper torque and preventing winding overheating. The Jard 12928 features a non-PCB, oil-filled design housed in a corrosion-resistant aluminum casing, engineered for continuous duty in temperatures ranging from -40°C to 70°C.
When you're out on a service call dealing with a motor that won't start or is pulling high amps, the 12928 MARS provides the necessary phase shift to keep the rotor in sync. Its compact oval case style and standard 1/4-inch male spade terminals ensure it fits into tight electrical cabinets where round capacitors might struggle. This is a go-to HVAC motor run capacitor for residential and light commercial air handlers and ventilation equipment.
Key Benefits
- 4 MFD 440V Dual Rating: Provides superior voltage protection and is compatible with both 370V and 440V HVAC capacitor replacement requirements.
- Technical Reliability: Meets EIA-456-A standards with an internal pressure interrupter for safety during end-of-life fault conditions.
- Environmental Resilience: Features a leak-proof aluminum construction and a wide operating temperature range for outdoor condensing units.
- Compact Integration: The oval run capacitor footprint is specifically designed for OEM mounting brackets in restricted spaces.
Common Questions
Can I use a 440V capacitor if the old one was 370V?
Yes. You can always go up in voltage rating (e.g., replacing a 370Vac with a 440Vac), but never down. Using the MARS 12928 440V rating actually provides a higher safety margin for the motor windings.
Does it matter which wire goes to which terminal on a single-run capacitor?
On a single-section capacitor like this one, there is no inherent polarity; however, standard practice is to connect the line side to the terminal marked with a dashed line or "identified" terminal if present, though functional performance remains identical either way.
What are the signs that my 4 MFD capacitor has failed?
Watch for a "bulged" top, leaking oil, or a motor that hums without turning. Always verify with a multimeter—if the reading is more than 6% away from 4 microfarads, it is time for a replacement.
This item is not eligible for free shipping.
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 12928 Run Capacitor is a standard replacement for 4 microfarad single-phase motor applications. Rated at 440Vac, this oval run capacitor is dual-rated, making it a reliable swap for 370V systems while offering increased dielectric strength for high-demand furnace blowers and condenser fan motors. As a tech, you know that keeping the induction motor within its specified 5% to 6% tolerance is critical for maintaining proper torque and preventing winding overheating. The Jard 12928 features a non-PCB, oil-filled design housed in a corrosion-resistant aluminum casing, engineered for continuous duty in temperatures ranging from -40°C to 70°C.
When you're out on a service call dealing with a motor that won't start or is pulling high amps, the 12928 MARS provides the necessary phase shift to keep the rotor in sync. Its compact oval case style and standard 1/4-inch male spade terminals ensure it fits into tight electrical cabinets where round capacitors might struggle. This is a go-to HVAC motor run capacitor for residential and light commercial air handlers and ventilation equipment.
Key Benefits
- 4 MFD 440V Dual Rating: Provides superior voltage protection and is compatible with both 370V and 440V HVAC capacitor replacement requirements.
- Technical Reliability: Meets EIA-456-A standards with an internal pressure interrupter for safety during end-of-life fault conditions.
- Environmental Resilience: Features a leak-proof aluminum construction and a wide operating temperature range for outdoor condensing units.
- Compact Integration: The oval run capacitor footprint is specifically designed for OEM mounting brackets in restricted spaces.
Common Questions
Can I use a 440V capacitor if the old one was 370V?
Yes. You can always go up in voltage rating (e.g., replacing a 370Vac with a 440Vac), but never down. Using the MARS 12928 440V rating actually provides a higher safety margin for the motor windings.
Does it matter which wire goes to which terminal on a single-run capacitor?
On a single-section capacitor like this one, there is no inherent polarity; however, standard practice is to connect the line side to the terminal marked with a dashed line or "identified" terminal if present, though functional performance remains identical either way.
What are the signs that my 4 MFD capacitor has failed?
Watch for a "bulged" top, leaking oil, or a motor that hums without turning. Always verify with a multimeter—if the reading is more than 6% away from 4 microfarads, it is time for a replacement.
This item is not eligible for free shipping.
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.
