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What Is A Cylinder Power Capacitor?

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 FunctionUniversal Data RangeApplication Advantage
Power Factor OptimizationRaise power factor from 0.70 to above 0.96Avoid utility company reactive power surcharges
Operating Temperature ReductionReduce cabinet internal temperature by 6℃-12℃Optimize heat dissipation to extend device service life
Current Balance AdjustmentControl three-phase current imbalance within 5%Prevent overheating loss of distribution lines
Low-order Harmonic FilteringFilter 3rd & 5th harmonic below 5%Purify power quality for low-voltage loops
Grid Transmission EnhancementImprove line utilization rate by 12%-18%Maximize the use of existing power distribution capacity

Tabela specyfikacji technicznych

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

Technical ItemUniversal Specification Data
Rated Working Voltage400V, 450V, 480V, 525V
Częstotliwość znamionowa50Hz / 60Hz
Single Unit Capacity5kvar - 50kvar (Optional)
Capacitance Tolerance±3% Strict Tolerance
Loss Tangent (tanδ)≤0.001 (25℃ Ambient Temperature)
Odporność na rozładowanieBuilt-in automatic discharge resistor
Shell MaterialSeamless Aluminum Cylinder Shell
Working Altitude≤1000m
Working Temperature-25℃ ~ +50℃
Design Service Life10 Years+ under rated working condition

Aplikacje branżowe

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. 

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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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.
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.
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.
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.
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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