A Cylinder Power Capacitor is a mainstream low-voltage shunt power capacitor featured with an integral cylindrical aluminum shell. Different from square box-type capacitors, this cylinder-shaped power capacitor adopts rolled metallized polypropylene film as the core dielectric and is sealed with insulating filling material inside the seamless aluminum cylinder housing. It is mainly designed for low voltage AC power distribution systems with 50/60Hz frequency.

Structurally simple and compact, the Cylinder Power Capacitor is equipped with built-in discharge resistors and overpressure safety protection devices. It focuses on reactive power compensation for industrial low-voltage loads such as motors, fans and compressors. Thanks to its round streamlined structure, this cylinder capacitor boasts better heat dissipation performance, stronger pressure resistance and excellent moisture-proof capability, making it widely used in commercial buildings, production workshops and complete power distribution cabinets.

Core Functions of a Cylinder Power Capacitor

Core Function	Universal Data Range	Application Advantage
Power Factor Optimization	Raise power factor from 0.70 to above 0.96	Avoid utility company reactive power surcharges
Operating Temperature Reduction	Reduce cabinet internal temperature by 6℃-12℃	Optimize heat dissipation to extend device service life
Current Balance Adjustment	Control three-phase current imbalance within 5%	Prevent overheating loss of distribution lines
Low-order Harmonic Filtering	Filter 3rd & 5th harmonic below 5%	Purify power quality for low-voltage loops
Grid Transmission Enhancement	Improve line utilization rate by 12%-18%	Maximize the use of existing power distribution capacity

Technical Specifications Table

This table helps engineers and procurement teams quickly match the right cylinder power capacitor to their system requirements.

Technical Item	Universal Specification Data
Rated Working Voltage	400V, 450V, 480V, 525V
Rated Frequency	50Hz / 60Hz
Single Unit Capacity	5kvar - 50kvar (Optional)
Capacitance Tolerance	±3% Strict Tolerance
Loss Tangent (tanδ)	≤0.001 (25℃ Ambient Temperature)
Discharge Resistance	Built-in automatic discharge resistor
Shell Material	Seamless Aluminum Cylinder Shell
Working Altitude	≤1000m
Working Temperature	-25℃ ~ +50℃
Design Service Life	10 Years+ under rated working condition

Industry Applications

Where Our Cylinder Power Capacitor Delivers Proven Results

A reliable Cylinder Power Capacitor never adopts rigid unified design since low-voltage power distribution circuits vary greatly in load types and operating conditions. Our cylinder-type power capacitor is engineered to adapt to diverse low-voltage industrial and commercial power scenarios. It effectively eliminates unnecessary reactive energy penalties for enterprises, maintains stable output voltage amid frequent load fluctuations, and suppresses trivial harmonic interference in daily power loops.

Industrial Motor & Induction Loads

Problem: Low power factor (0.65–0.75) due to large motors, transformers, and welding equipment.
Solution: Install low voltage power capacitor banks at motor terminals or main distribution panel.
Result: PF raised to ≥0.96; energy loss cut by 12–18%; payback period < 8 months.

Commercial HVAC & Lighting Systems

Problem: High harmonic content and monthly kVAR charges from chillers, elevators, and LED drivers.
Solution: Detuned power factor correction capacitor with 7% or 14% reactor.
Result: Compliance with utility PF penalty limits; 10–15% lower electricity bills.

Renewable Energy (Solar & Wind Farms)

Problem: Fluctuating reactive power causing grid instability and inverter overheating.
Solution: Automated high voltage power capacitor banks with step controllers.
Result: Smooth voltage profile, increased inverter lifespan, and improved feed-in tariff eligibility.

Utility Substations & Distribution Networks

Problem: Seasonal PF drop due to light load conditions and long transmission lines.
Solution: Switched power capacitor racks with vacuum contactors.
Result: Reduced line losses, freed up transformer capacity, and delayed infrastructure upgrades.

Why Choose ZHIMING's HV Three Phase Power Capacitor?

Optimized Cylindrical Heat Dissipation Structure

ZHIMING adopts one-piece seamless aluminum cylinder shell. Compared with square capacitors, the circular structure expands heat dissipation area, lowers internal operating temperature, and avoids overheating aging during long-term continuous operation.

High-purity Metallized Film Material

This Cylinder Power Capacitor uses imported high-strength metallized polypropylene film with extremely low dielectric loss. Its self-healing property effectively prevents breakdown damage caused by voltage surge, ensuring stable electrical performance.

Multiple Built-in Safety Protection

Equipped with internal overpressure disconnection device, automatic discharge resistor and thermal protection component. When overcurrent or overvoltage occurs, the capacitor cuts off the circuit intelligently to avoid bulging, leakage and explosion risks.

Strong Environmental Adaptability

The fully sealed filling structure achieves excellent moisture-proof, dust-proof and corrosion-resistant effects. It can run stably in humid workshops, dusty factories and other harsh working environments without performance attenuation.

Easy Installation & Space Saving

Vertical cylindrical layout with bottom fixed bolt design fits standard power distribution cabinet installation. Its compact size saves cabinet internal space and simplifies wiring steps for on-site workers.

Cost-effective & Low Failure Rate

With mature winding technology and strict factory inspection, the failure rate is controlled below 0.3%. No daily maintenance is required, greatly reducing later operation and replacement costs for users.

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1. What is the main application of ZHIMING Cylinder Power Capacitor?

It is widely used in 400V low-voltage three-phase power systems, applicable for industrial workshops, commercial buildings, pumping stations, mechanical processing plants and other places with inductive loads. It is mainly used for power factor correction and reactive power compensation.

2. Why choose cylindrical shell instead of square shell?

The cylindrical structure has uniform pressure resistance without stress dead angle. It dissipates heat more evenly and is not easy to deform under high temperature. Meanwhile, the seamless aluminum shell effectively prevents insulating oil leakage, boasting higher safety than square capacitors.

3. Does this cylinder capacitor support continuous 24-hour operation?

Yes. Under rated voltage and standard ambient temperature, the product can work continuously for a long time. The optimized heat dissipation structure ensures no heat accumulation during non-stop operation, which meets the needs of industrial all-day production.

4. What should I pay attention to during capacitor installation?

Keep the capacitor vertically installed to ensure natural heat convection. Reserve enough heat dissipation space around it and avoid installation in direct sunlight or severe corrosive gas environment. Cut off the power and wait for discharge before maintenance.

5.What warranty policy does ZHIMING offer?

We provide 2-year free warranty and permanent after-sales technical guidance. Any non-human damage quality problem within the warranty period enjoys free replacement service. Customized voltage and capacity are available for bulk orders.

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What Is A Cylinder Power Capacitor？

Core Functions of a Cylinder Power Capacitor

Technical Specifications Table