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Power Capacitors
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- BSMJ Series Self-healing Low Voltage Shunt Capacitors
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- BY81 Series Intelligent Capacitor
- BY82J Series Anti-harmonic Intelligent Capacitor
- BY89 Series Intelligent Capacitor
- Intelligent Controller Series
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- Circuit Breaker
- APF/SVG/SPC Cabinet & Module Series
BYCM1E-125 Series Molded Case Circuit Breaker 380V AC MCCB Circuit Breaker 3-Phase PV AC MCCB for PV Power Systems
Main Specification of BYCM1E-125 Series Electronic Molded Case Circuit Breaker
| Model | BYCM1E-125 Electronic Molded Case Circuit Breaker |
| Rated Current (ln) | 32A |
| Long time setting current (lr1)(A) | 16-32 |
| Poles | 3 |
| Rated Voltage | 380V |
| Rated lmpulse Withstand Voltage | 8KV |
| Rated Short-TimeWithstand Current (KA/1S) | 2 |
| Arc Distance (Upperand Lower)(mm) | 50/0 |
| Rated Ultimate Short-.Circuit Breaking Capacity(lcu)(kA) | 50 |
| Rated Operational Short-Circuit Breaker Capacity(lcs)(kA) | 35 |
Introduction of BYCM1E-125 Series Electronic Molded Case Circuit Breaker
The BYCM1E-125 Series Molded Case Circuit Breaker (MCCB) by Baoyu Holdings Ltd. is a premium 380V AC, 3-phase circuit protection solution engineered for photovoltaic (PV) power systems. Designed to deliver robust overload and short circuit protection, this molded case circuit breaker integrates advanced LSIG protection (Long-time, Short-time, Instantaneous, and Ground Fault) to safeguard PV installations against electrical faults. Its high-breaking capacity ensures reliable motor circuit protector functionality, while the over temperature protection circuit and over voltage detector enhance safety in demanding environments. Compatible with both AC and DC systems, the BYCM1E-125 Series supports MCB for DC circuits and MCB for lighting circuits, making it versatile for diverse applications.Featuring polarity protection circuit and varistor voltage stabilization, this MCCB minimizes risks from voltage surges and reverse polarity. It complies with AFCI required standards to prevent arc faults and includes over voltage and under voltage protection to maintain grid stability. Unlike standard ABB air circuit breaker models, this unit is optimized for renewable energy systems, offering overload short circuit protection with adjustable trip settings. The moulded case MCCB LSIG design ensures durability, while its compact form factor simplifies integration into existing PV setups. Whether used as a standalone air circuit breaker or paired with MCB electrical breaker systems, the BYCM1E-125 Series guarantees unmatched reliability for industrial and commercial solar installations.
Baoyu Holdings Ltd.’s BYCM1E-125 Series molded MCCB redefines circuit protection for modern PV power systems. Engineered for 380V AC operations, this 3-phase PV AC MCCB combines over voltage and over current protection with precision LSIG protection to address harmonic distortion, phase imbalances, and transient faults. Its molded MCB construction ensures superior thermal resilience, while the overload outlet monitoring feature prevents downtime caused by excessive loads. The breaker’s over voltage circuit mechanism works seamlessly with varistor voltage suppressors, offering layered defense against grid anomalies.Ideal for solar farms and industrial plants, this MCCB supports MCB in electrical circuit configurations and complies with global standards for motor circuit protector safety. The inclusion of over temperature protection circuit technology mitigates risks from overheating, and its polarity protection circuit prevents damage from incorrect DC wiring. For enhanced adaptability, the BYCM1E-125 Series supports AFCI required setups to eliminate fire hazards and integrates over voltage and under voltage protection to stabilize microgrids. Compared to traditional ABB air circuit breaker units, this model excels in renewable energy applications, providing overload short circuit protection with customizable thresholds. Whether used alongside MCB for lighting circuits or as a standalone air circuit breaker, its moulded case MCCB LSIG design ensures long-term performance, making it the ultimate choice for engineers prioritizing circuit protection and energy efficiency in PV systems.
Key Features of BYCM1E-125 Series Electronic Molded Case Circuit Breaker
Current limiting and interrupting capabilities
When a short circuit occurs in a circuit breaker, the contacts open quickly and an arc is generated, which is equivalent to introducing a rapidly increasing arc resistance in the circuit, thereby limiting the increase of fault current. The shorter the disconnection time of the circuit breaker, the closer its Ics (operating short-circuit breaking capacity) is to Icu (ultimate short-circuit breaking capacity), and the better the current limiting effect, which can significantly reduce the adverse effects of short-circuit current on the circuit breaker and electrical equipment such as electromagnetic effects, dynamic effects and thermal effects, thereby extending the service life of the circuit breaker.
Short circuit protection
Short circuit protection means instant tripping when a short circuit occurs. The protection setting value should be adjusted in time after the load changes to prevent the setting value from being too low, causing frequent tripping and affecting the power supply quality; or the setting value from being too high, which cannot effectively protect the circuit and equipment.
Overload delay protection
Overload delay protection means that when the load current exceeds the rated range of the equipment and may cause damage to the equipment, the protection device can cut off the power supply within a certain period of time. Overload involves the process of heat accumulation, so the protection action does not need to be too fast. For short-term overcurrent, the protection device should not operate.
Isolation function
The isolation function requires that the leakage current after the circuit breaker is disconnected will not cause harm to personnel or equipment. After multiple short-circuit trips, the switch performance may degrade, resulting in increased leakage current. For personal safety, leakage currents below 30mA are considered safe. However, in harsh environments, leakage currents exceeding 300mA for more than 2 hours may damage the insulation, causing a phase-to-ground short circuit and possibly a fire.
Leakage protection
There are two types of leakage protectors: thermal magnetic and electronic. Compared with thermal magnetic, electronic leakage protectors have the advantages of small size, high precision, high sensitivity, etc., but poor anti-interference ability. Currently, electronic leakage protectors are the main ones on the market. When the leakage current reaches the set value, the execution circuit receives the induced voltage signal on the secondary side of the zero-sequence current transformer, drives the switch contacts to output the leakage protection signal, and triggers the release to cut off the power supply.The leakage tripping current setting value of the main terminal switch is 30mA, while the leakage tripping current setting value of the upstream branch switch is 300mA. Arc faults have a high risk of fire, and short-circuit protection is difficult to effectively block. However, the leakage protector can reliably disconnect the grounding fault to prevent electric shock and phase-to-ground short-circuit accidents.
Product Size
AgC4 silver contacts have excellent conductivity and arc resistance：The BYCM1E-125 Series Molded Case Circuit Breakers (MCCBs) feature advanced AgC4 silver contacts, a premium material known for its superior conductivity and durability in high-voltage environments. AgC4 is a silver-graphite composite that ensures minimal contact resistance, enabling efficient current transfer while reducing energy losses—critical for energy-optimized photovoltaic (PV) systems. Unlike standard silver alloys, AgC4 has superior arc resistance, significantly reducing contact corrosion during frequent circuit interruptions due to overload or short circuits in 380V AC applications. This extends the product's life and reduces maintenance costs for PV systems. The material's high thermal stability (withstands temperatures up to 1,200°C) prevents welding under extreme fault currents, ensuring reliable circuit protection in harsh industrial and renewable energy environments. With integrated AgC4 contacts, this three-phase MCCB offers superior performance in harmonic mitigation, three-phase unbalanced solutions, and PV circuit protection, meeting global safety and efficiency standards.
Use flame retardant material shell to enhance safety：The BYCM1E-125 molded case circuit breaker puts safety first, with a UL 94 V-0 certified flame-retardant material for the housing that self-extinguishes within seconds of ignition. This thermoset composite withstands temperatures exceeding 960°C, preventing flame spread even during severe electrical faults—critical for photovoltaic power generation systems exposed to high DC voltages and environmental stresses. The material’s low smoke emissions protect personnel and equipment in confined spaces by reducing the release of toxic gases. Its superior dielectric strength (>20kV/mm) ensures insulation integrity and prevents leakage current in 380V AC applications. In addition, the housing’s UV and corrosion resistance ensures long-term reliability for outdoor photovoltaic installations. By combining flame retardancy with mechanical strength, this molded case circuit breaker meets IEC/EN 60947-2 standards, providing unparalleled circuit protection against fire hazards while supporting reactive power compensation schemes and power quality improvements.
Use high-purity copper conductors to optimize thermal management：The BYCM1E-125 series uses high-purity oxygen-free copper (OFC) conductors to improve the thermal and electrical efficiency of three-phase photovoltaic systems. OFC's purity of up to 99.99% minimizes resistive heating and reduces energy losses by up to 30% compared to standard copper alloys, which is critical to maintaining power quality in high-current applications. The low coefficient of thermal expansion ensures that the conductors maintain a stable connection under fluctuating loads, preventing loosening caused by intermittent faults in photovoltaic systems. Paired with AgC4 contacts, the design achieves seamless current interruption up to 125A, effectively controlling three-phase imbalance and harmonic distortion. The excellent heat dissipation performance of copper works in synergy with the flame-retardant housing to keep the operating temperature below 70°C even at full load. This molded case circuit breaker complies with IEC 60898 and RoHS directives, making it an ideal choice for smart circuit protection solutions, providing long life and environmental performance for solar projects around the world.
Storage Workshop
Production workshop
Workshop Vedio
Baoyu Holdings Limited
Baoyu Holdings Co., Ltd. was established in 2015 and is located in Wenzhou City, Zhejiang Province. It has a superior geographical location and convenient transportation. We have very rich industry experience and are a trustworthy 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 compensators, composite switches, capacitor contactors, thyristor switches, reactors, etc. Our company is well aware that the company's development depends on the innovation and quality of its products. Therefore, our products are subject to strict quality control from raw material procurement to finished product sales. The company has established a quality management system that meets the requirements of the international quality management system. According to market and customer needs, the company continuously launches original and innovative results, and always maintains the novelty and innovation of its products. The company thinks what customers think and is anxious about what customers are anxious about. Solving problems for customers and meeting customer needs is our eternal pursuit! Our company's products are sold all over the world. The company has won unanimous recognition from consumers with satisfactory product quality and perfect after-sales service. We have a professional R&D team and accept OEM and ODM (custom production). We sincerely welcome friends from all over the world to visit us and cooperate with us on the basis of long-term mutual benefits. Looking forward to your inquiries.
Intelligent production equipment
The company's workshop is equipped with a modern mold center, technology research and development center, and intelligent digital testing equipment to achieve full-process automation management from raw material processing to finished product assembly. The production line uses advanced CNC machine tools and automated assembly systems to ensure product accuracy and consistency.
Strict quality control
The workshop has passed the ISO international quality management system certification and established a number of quality inspection procedures such as harmonic testing, insulation strength testing, and temperature rise testing to ensure that each device meets international standards. It is worth mentioning that the company's products have been used for a long time in key projects at home and abroad, and their quality stability has been verified.
Flexible production capabilities
To meet the diverse needs of overseas customers, the workshop supports small-batch customization and fast delivery. For example, it can adjust product parameters according to the power grid standards of the customer's country (such as 60Hz in Europe and the United States, 50Hz in the Middle East), and provide a multi-language operating interface.
Global Market Layout
The company's products have been exported to more than ten countries in Europe, Southeast Asia, the Middle East, etc., covering factories, petrochemicals, solar power generation, etc. By participating in international exhibitions such as the Russian HVAC Exhibition and the matchmaking meetings organized by the Zhejiang Provincial Department of Commerce, the company directly contacts overseas buyers and showcases its technical solutions.
Customized solutions
The company provides integrated solutions of "product + service" for different national power grid environments and industry needs. For example, it designs high-protection level equipment for ship or airport projects and optimizes harmonic control solutions for new energy projects. The technical team conducts R&D cooperation with top universities such as Zhejiang University and Shanghai Jiaotong University to ensure technological leadership.
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
