-
Power Capacitors
- BY71 Series Cylindrical Capacitor
- BSMJ Series Self-healing Low Voltage Shunt Capacitors
- BY86 Series Controlled Intelligent Capacitor
- BYKXG/F Series Anti-harmonic Intelligent Capacitor
- BY81 Series Intelligent Capacitor
- BY82J Series Anti-harmonic Intelligent Capacitor
- BY89 Series Intelligent Capacitor
- Intelligent Controller Series
- Reactor
- Intelligent Switch Series
- Alternating Current Contactor
- Multifunctional power instruments
- Circuit Breaker
- APF/SVG/SPC Cabinet & Module Series
BY71 0.45-25-3 Series Intelligent Cylindrical Three Phase Capacitor 450V Low Voltage 25 Kvar Power Capacity Low Loss Capacitor
Model meaning

Product Specfication of BY71 0.45-25-3 Cylindrical Capacitor
| Model | BY71 0.45-25-3 | |
| Rated Working Voltage | 450V | |
| Capacitor Capacity | 393.2μF | |
| Rated Working Current | 32.1A | |
| Loss angle Tangent Value | ≤0.0012 at rated power frequency voltagev | |
| Capacitance Deviation | The discrepancy between the measured value and the rated value of the capacitor shall not exceed 0 to +10%, and the ratio of the maximum to minimum capacitance measured between any two line terminals in a three-phase capacitor shall exceed 1.08. | |
| Withstand Voltage Test | Interpolar | Power frequency 2.15Un, 2S |
| Polar shell | Rated voltage of 600V and below, applied voltage of 3.6kV, 5S | |
| Rated voltage of 600V and below, applied voltage of 7.2kV, 5S | ||
| Maximum Allowable Overvoltage | 1.1Un, not exceeding 8h every 24h | |
| Self Discharge Function | The capacitor is equipped with a discharge device, which can reduce the remaining voltage of the capacitor from 2Un to 75V or below within 3 minutes of disconnecting the power supply | |
| Standards | Equipped with a discharge device, the capacitor can reduce its residual voltage from 2Un to 75V or lower within 3 minutes after the power supply is disconnected. | |
Introduction of BY71 0.45-25-3 Series Cylindrical Capacitor
The BY71 0.45-25-3 Series is a high-capacity capacitor designed for three-phase power systems, delivering unmatched harmonic capacitor functionality to resolve harmonics problems in industrial grids and electrical equipment. Engineered as a low-voltage power capacitor (450V), it suppresses harmonic distortion caused by nonlinear loads (e.g., VFDs, inverters) while stabilizing power quality and reducing reactive power losses by up to 30%. Its cylindrical capacitor design ensures uniform energy distribution across phases, making it ideal for HVAC capacitor retrofits, distribution capacitors, and filter capacitor applications in manufacturing plants or data centers.With capacitance per unit length optimized for three-phase cylindrical capacitors, this intelligent capacitor dynamically adjusts its compensation based on real-time grid conditions. It integrates seamlessly with capacitors in series configurations or standalone capacitor sets, providing scalable solutions for transmission capacitors and line capacitors in high-voltage equipment environments. Its low-loss dielectric material minimizes heat generation, extending lifespan even in high-demand 3-phase electric systems.
Built for durability, the BY71 0.45-25-3 combines capacitance for cylindrical capacitor precision with ruggedized insulation, rated for harsh environments like mining sites, steel mills, and renewable energy farms. As a low-voltage capacitor (450V), it excels in capacitor on power line installations, offering high energy capacitors performance with a compact footprint. Its cylindrical capacitance structure enhances heat dissipation, ensuring stable operation under fluctuating 3-phase power voltage conditions.This industrial capacitor supports start capacitor functionality for heavy machinery, reducing inrush currents and protecting electrical equipment from voltage sags. Compatible with capacitors online monitoring systems, it enables remote diagnostics and predictive maintenance, aligning with smart grid standards. The capacitor power efficiency meets IEC 60831 and IEEE 18 standards, making it a reliable choice for distribution capacitors in commercial complexes or transmission capacitor upgrades.
The BY71 0.45-25-3 series addresses diverse needs, from harmonic capacitor solutions in solar farms to reactive power compensation in HVAC capacitor networks. Its three-phase cylindrical capacitors design ensures balanced load distribution, resolving harmonics problems such as voltage flicker and transformer overheating. For high-voltage equipment setups, it pairs with line capacitors to enhance grid stability and reduce energy waste.Ideal for capacitance of cylindrical capacitor with dielectric precision, this low-loss capacitor cuts operational costs by minimizing downtime and maintenance. It also serves as a filter capacitor in UPS systems and electrical equipment protection circuits, safeguarding sensitive electronics from grid anomalies. With global certifications and compatibility with capacitor sets, the BY71 series offers a future-proof investment for improving power quality in 3-phase power systems while delivering rapid ROI through energy savings.

Main Advantages of BY71 0.45-25-3 Series Cylindrical Capacitor
Three-phase reactive power optimization and grid stability
The BY71 0.45-25-3 series redefines shunt capacitor compensation in three-phase power systems with its 25 kVar smart capacity, designed to stabilize power quality in industrial and commercial grids. Unlike single-phase models, this three-phase capacitor dynamically balances reactive loads on all phases, eliminating inductive imbalances created by heavy machinery, HVAC systems, and renewable energy inverters. Manufactured with metallized polypropylene film and high-reliability self-healing technology, it autonomously repairs dielectric micro-faults, ensuring long service life and minimal capacitor power loss even in high-stress environments. This low-voltage capacitor (450V AC) operates precisely at low voltages, reducing capacitor power loss by 30% compared to traditional designs. Its compact cylindrical capacitor form factor enhances heat dissipation and fits seamlessly into crowded switchboards, making it ideal for retrofitting aging power quality equipment. By optimizing shunt capacitor compensation, it corrects power factor to near unity, meeting global power efficiency standards and reducing utility fines.
Intelligent monitoring and low-loss performance
Designed for smart grid integration, the BY71 0.45-25-3 series features IoT power quality device connectivity for real-time monitoring of capacitor power parameters such as voltage, current and harmonic distortion. Its low-loss cylindrical capacitor design leverages advanced metallized film technology to minimize eddy current losses and achieve 98% reactive power compensation efficiency. The self-healing shunt capacitor mechanism isolates faults without human intervention, ensuring uninterrupted operation, which is critical for mission-critical electrical equipment such as data centers and manufacturing plants. The 450V AC shunt capacitor excels in three-phase unbalance correction, redistributing loads to prevent overheating and voltage sags. Its 25 kVar capacity supports high-demand applications such as solar farms and wind turbines, stabilizing low-voltage grids during intermittent power generation. Compliance with IEC and UL standards ensures safe and reliable AC capacitor performance, while RoHS-compliant materials ensure environmentally friendly operation. This capacitor solution bridges the gap between traditional power system capacitors and modern smart grid needs.
Durable design and multi-industry adaptability
The BY71 0.45-25-3 series capacitors combine rugged construction with a compact cylindrical design, making them versatile and suitable for harsh environments such as mining sites, refineries and offshore wind farms. Its metallized polypropylene film capacitor structure resists humidity, temperature fluctuations and mechanical vibration, ensuring reliable capacitor compensation under extreme conditions. The 25 kVar output power of this three-phase capacitor effectively manages reactive power in large power quality products such as arc furnaces and transmission systems, and its self-healing technology can reduce maintenance costs by 50%. Designed for low-voltage capacitor networks (450V AC), this series of capacitors can mitigate harmonic distortion and voltage swells, thereby improving the power quality of three-phase power infrastructure. This AC power capacitor can also be integrated with renewable energy systems to smooth the fluctuations of grid-connected solar/wind energy to meet global power energy compliance requirements. With a service life of 100,000 hours and modular scalability, it can future-proof power quality equipment investments and provide unparalleled ROI for industries that prioritize sustainability and operational resilience.

Product dimensions

| Model | M | H | Installation sole |
| BY71 0.45-25-3 | 116mm | 245mm | M16×25mm |
Applications of BY71 0.45-25-3 Cylindrical Capacitor

Smart Buildings & Data Centers
The BY71 0.45-25-3 series handles reactive loads such as HVAC, lighting, and server farms, ensuring power quality in smart buildings and hyperscale data centers. Its three-phase capacitor design provides 25 kVar parallel capacitor compensation, stabilizes low-voltage capacitor (450V AC) grids, and reduces capacitor power losses caused by inductive unbalance. Self-healing technology automatically repairs dielectric faults, ensuring uninterrupted performance of AC power capacitors during frequent load fluctuations. The series features a compact cylindrical design that saves space in modular distribution units while optimizing power factor correction to meet LEED energy standards. Integrated power quality device connections enable real-time monitoring, which is essential to preventing downtime of critical electrical equipment.

Industrial Manufacturing Facilities
In heavy industrial sectors such as automotive and steel production, the BY71 0.45-25-3 Series capacitors mitigate power quality issues caused by high-power motors and arc furnaces. This three-phase capacitor neutralizes reactive loads through shunt capacitor compensation, balancing differences in capacitors across phases and reducing capacitor power consumption by 25%. Its metallized polypropylene film construction withstands extreme temperatures and vibration, while high-reliability self-healing technology minimizes maintenance costs. The low-loss cylindrical capacitor design ensures efficient reactive power management, stabilizes the low-voltage (450V) grid, and protects power system capacitors from harmonic distortion. It is ideal for CNC machine tools and assembly lines, extending the service life of power quality equipment and meeting global power energy efficiency goals.

Renewable Energy Systems (Solar/Wind Farms)
The BY71 0.45-25-3 series stabilizes three-phase power from solar and wind farms, offsetting reactive imbalances caused by inverters and fluctuating generation. Its 450V AC shunt capacitor design smoothes grid-connected power output and mitigates voltage fluctuations and harmonic distortion caused by intermittent renewable energy. Self-healing shunt capacitor technology ensures durability in harsh outdoor environments, while low capacitor power losses optimize capacitor compensation efficiency. By improving power quality, it supports compliance with grid specifications such as IEEE 1547 and reduces wind abandonment losses. This compact cylindrical capacitor integrates seamlessly with solar inverters and wind turbine controllers, providing reliable AC capacitor performance for sustainable global power energy integration.
Storage Workshop

Production workshop

Workshop Vedio
Baoyu Holdings Limited - Your trusted partner for intelligent power quality solutions
Baoyu Holding Co., Ltd. was founded in 2015 and is located in Wenzhou City, Zhejiang Province. The location is excellent and the transportation is convenient. We have very rich industry experience and is a trusted supplier. The company has advanced production equipment and skilled front-line employees. Our company is mainly engaged in the production and sales of power quality products,such as active power filters, static var generators, intelligent capacitors, power capacitors, reactive power compensators, composite switches, capacitor contactors, thyristor switches, reactors. Our company knows that the development of the company depends on the innovation and quality of the products. Therefore, our products have strict quality control from the procurement of raw materials to the sale of finished products. The company has established a quality management system that meets the requirements of the international quality management system. The company continuously releases the original innovations according to the market and customer needs, and always maintains the novelty and innovation of the products. The company wants the customer's thoughts and urgency. Solving problems for customers and meeting customer needs is our eternal pursuit! Our company's products are sold worldwide. The company has won the unanimous recognition of consumers with satisfactory product quality and perfect after-sales service. We have a professional R & D team. We can accept O E M and O D M.We sincerely welcome friends from all over the world to visit our company and cooperate with us on the basis of long-term mutual benefits. We are looking forward to receiving your enquiry soon.
Our storage facility utilizes precision climate control, automated 3D warehousing (which increases capacity by 200%), and integrated safety systems (including fire suppression, anti-static protocols, and monthly audits) to maintain zero oxidation and ensure product integrity. In addition, our cleanroom manufacturing facility features a combination of natural and LED lighting, optimized workflows, and cross-trained technicians to enhance efficiency. Automated quality control systems and ISO-certified processes ensure compliance with dimensional and electrical standards, while AI-driven analytics and stringent protocols help achieve near-zero defects. By integrating advanced automation, tailored solutions, and steadfast reliability, Baoyu provides durable, mission-critical power systems, reinforcing our status as the preferred global partner for industries that require precision and innovation.
Business license

High-tech enterprise certificate
ISO management system certification



Corporate honors


Product certification certificate

Product testing report

Company patent certificate

Well-known domestic partners


