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BYCM1L-125L Series Molded Case Circuit Breaker with Residual Current Protection 3 Phases MCCB AC400V

Complementing our power quality solutions, the BYCM1L Series Molded Case Circuit Breakers (MCCB) provide robust circuit protection for 50Hz AC distribution networks. Rated for 400V and up to 800A, these main power circuit breakers safeguard systems against overloads, short circuits, and ground faults. Ideal for electric power infrastructure, they prevent fatal electric shocks and fire risks caused by insulation failures, while supporting infrequent motor switching and circuit control.As leading MCCB circuit breaker manufacturers, Baoyu combines innovation with reliability. The BYCM1L model case circuit breaker series excels as a main circuit breaker for industrial power distribution, while compact miniature case circuit breaker variants cater to space-constrained installations. Together with the BY86DS capacitors, our solutions form a comprehensive ecosystem of circuit protection devices, ensuring safety, efficiency, and longevity for critical electrical systems.Trust Baoyu’s expertise in power breakers and smart energy management to optimize your grid performance. Contact us for tailored circuit circuit breaker and power quality solutions.

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Main Specification of BYCM1L-125L Series Molded Case Circuit Breaker

Model	BYCM1L-125L Series Molded Case Circuit Breaker
Rated working voltage	AC 400V
Rated insulation voltage	AC800V
Frequency	50Hz
Rated current lnA	10,16,20,25,32,40,50,63,80,100
Poles	2
Rated Short-Circuit Breakingcapacity	35KA/0.25
Rated Operational Short-Circuit Breaking Capacity	22KA/0.25
Rated Residual Operating Current I△n mA	30/100/500
Rated Residual Operating Current I△no mA	30/50/250

BYCM1L-125L Series Molded Case Circuit Breaker Products Overview

The BYCM1L-125L Series Controlled Intelligent Capacitors by Baoyu Holdings Limited deliver advanced energy efficiency and power quality optimization for industrial and commercial applications. Designed to address harmonic distortion and three-phase imbalances, these 450V-rated capacitors enhance grid stability while reducing energy waste. Integrated with smart control technology, they dynamically adjust reactive power compensation to ensure optimal electrical performance and compliance with modern energy standards.BYCM1L-125L Series Molded Case Circuit Breaker with Residual Current Protection Developed by Baoyu Holdings Limited, a trusted leader among MCCB Circuit Breaker Manufacturers, this 3-Phase Molded Case Circuit Breaker (MCCB) delivers robust circuit protection for electric power systems up to AC400V. Designed as a versatile Main Power Circuit Breaker or Power Breaker, it integrates advanced over-voltage circuit protection, residual current detection, and AC protection circuit compatibility to address harmonics, phase imbalances, and electrical faults. Featuring MCCB 3 Phase efficiency, durable Model Case Circuit Breaker construction, and seamless synergy with ACB protection systems, it ensures reliable load management and safeguards equipment as part of comprehensive circuit protection equipment networks. Ideal for industrial and commercial applications, this MCCB Electrical solution from a top-tier MCCB Circuit Breaker Manufacturer prioritizes safety, energy efficiency, and compliance with global standards. Power Smarter. Protect Better.

BYCM1L-125L Series Molded Case Circuit Breaker

Function Introduction of BYCM1L - 125L Series Molded Case Circuit Breaker Products

Engineered for precision and reliability, the BYCM1L-125L Series Molded Case Circuit Breaker (MCCB) is designed to safeguard three-phase electrical systems operating at AC400V. This advanced device combines residual current protection with overload and short-circuit prevention, making it ideal for industrial, commercial, and residential applications. By detecting and interrupting faulty currents, it ensures personnel safety and equipment integrity while complying with rigorous standards for AC Protection Circuit and Circuit Protection Equipment. The MCCB integrates seamlessly with Power Breakers and Main Circuit Breakers, offering comprehensive protection against overvoltage, harmonic distortion, and phase imbalances.

Key Features for Robust Electrical Systems
Featuring a compact, modular design, the BYCM1L-125L Series provides adjustable trip settings and real-time monitoring to adapt to dynamic load requirements. Its residual current detection mechanism quickly identifies ground faults, reducing the risk of electric shock and fire hazards. The MCCB is compatible with Main Power Circuit Breakers, enabling synchronized system shutdown during emergencies. Built with high-quality materials and advanced arc-extinguishing technology, it withstands extreme conditions while maintaining optimal performance. Ideal for Mccb Electrical and Mccb 3 Phase applications, this breaker supports efficient energy distribution and minimizes downtime in critical infrastructure.

Enhanced Safety and Compliance
Certified to international standards, the BYCM1L-125L Series ensures compliance with Mccb Circuit Breaker Manufacturers’ specifications and industry regulations. Its user-friendly interface simplifies installation and maintenance, while built-in thermal and magnetic protection mechanisms guarantee reliable operation. The MCCB’s compatibility with Mccb Molded Case Circuit Breakers and Moulded Case Circuit Breaker Mccb systems allows for scalable solutions in complex electrical networks. By prioritizing safety and performance, this breaker safeguards against Over Voltage Circuit risks and contributes to long-term system stability, positioning it as a trusted choice for professionals seeking durable, high-efficiency Circuit Protection Devices.

Modular Design for Versatile Applications
Featuring a compact, Model Case Circuit Breaker form factor, the BYCM1L-125L Series offers seamless integration into diverse electrical setups, from industrial machinery to commercial buildings. Its modular construction allows for easy customization with accessories like shunt trips and auxiliary contacts, expanding its utility in Mccb Electrical environments. The breaker’s residual current detection (RCD) capability adds an extra layer of safety, complying with strict standards for Ac Protection Circuit and Circuit Protection Equipment. Ideal for Mccb 3 Phase applications, it balances robust protection with space efficiency, making it a go-to choice for professionals prioritizing performance and flexibility.

BYCM1L-125L Series Molded Case Circuit Breaker

Product size information

Model	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12	H	a	b	d
BYCM1L -125L	92	150	94	75	51	89	15	30	50	50	2	2	76	30	129	∅4.5

BYCM1L-125L Series Molded Case Circuit Breaker

13 Plates, composite copper zigzag design - Rapid arc extinguishing

The BYCM1L - 125L Series Molded Case Circuit Breaker with Residual Current Protection 3 Phases MCCB AC400V features a remarkable design with 13 plates and a composite copper zigzag structure. This unique design is a game - changer in the field of circuit protection.Mccb Circuit Breaker Manufacturers understand the importance of rapid arc extinguishing in a breaker. When a fault occurs in the Mccb Circuit, an arc is generated. The 13 - plate composite copper zigzag design acts as an efficient arc - quenching mechanism. Copper is an excellent conductor of heat and electricity. The zigzag shape increases the path length for the arc, which helps in dissipating the energy of the arc more quickly.This design is crucial for the overall performance of the breaker as a Circuit Protection Device. It ensures that the breaker can interrupt the circuit rapidly and safely, protecting the connected electrical equipment from damage caused by the arc. It also works in harmony with other Circuit Protection Equipment, such as Power Breakers and Main Circuit Breakers, to provide a comprehensive protection system for the Electric Power network. This design is especially beneficial in Mccb 3 Phase systems, where the fault currents can be complex and high - magnitude.

BYCM1L-125L Series Molded Case Circuit Breaker

Bold copper Coil - Short circuit protection

The bold copper coil in the BYCM1L - 125L Series Molded Case Circuit Breaker is a key component for short - circuit protection. In any electrical system, short circuits are a major concern as they can cause significant damage to the equipment and pose a safety risk.As a high - quality Model Case Circuit Breaker, the use of a bold copper coil is a strategic choice. Copper has low resistance, which means it can handle high currents without overheating. When a short - circuit occurs in the Mccb Circuit, a large amount of current tries to flow through the circuit. The bold copper coil can quickly detect this abnormal increase in current.It then triggers the breaker to trip, interrupting the circuit and protecting the system from the potentially catastrophic effects of a short circuit. This short - circuit protection feature is essential for maintaining the stability of the Main Power Circuit Breaker and the entire electrical infrastructure. It is also an important part of the Ac Protection Circuit, ensuring that the system can withstand short - circuit events without causing extensive damage. This makes the breaker a reliable choice for Mccb Electrical applications where short - circuit protection is of utmost importance.

BYCM1L-125L Series Molded Case Circuit Breaker

95% AgC4 of silver contact - Overload protection

The use of 95% AgC4 silver contact in the BYCM1L - 125L Series Molded Case Circuit Breaker is a significant advantage for overload protection. In an electrical system, overloads can occur when the current drawn by the connected equipment exceeds the rated capacity of the circuit.Silver is known for its excellent electrical conductivity and low contact resistance. The 95% AgC4 silver contact in this breaker ensures a stable and efficient flow of current under normal operating conditions. When an overload situation arises in the Mccb Circuit, the contact material can withstand the increased heat generated by the excess current without degrading quickly.This allows the breaker to accurately sense the overload and trip at the appropriate time, protecting the equipment from damage due to overheating. As a crucial part of the Circuit Protection Equipment, this feature enhances the overall reliability of the breaker. It also contributes to the proper functioning of the Acb Protection system, ensuring that the electrical system can handle overloads safely. For Mccb 3 Phase applications, where the load distribution can be complex, the 95% AgC4 silver contact provides a reliable means of overload protection, making the BYCM1L - 125L Series an ideal choice for a wide range of electrical systems.

Application scenarios of the product

Family Industrial equipment Charging pile

Storage Workshop

Intelligent Storage Workshop

Production workshop

Digital Production Workshop

Workshop Vedio

Baoyu Holdings Co., Ltd. - Your Trusted Partner in Power Quality Solutions

As a leading high-tech enterprise specializing in intelligent power quality management and circuit protection systems, Baoyu Holdings Co., Ltd. is dedicated to delivering cutting-edge solutions for global clients facing challenges in harmonic mitigation, three-phase imbalance correction, and energy efficiency optimization. With over a decade of expertise in R&D, manufacturing, and service integration, we empower industries worldwide to enhance grid stability, reduce energy waste, and protect critical electrical infrastructure.

Product Strength: Innovation Meets Precision

Our product portfolio encompasses smart grid-compatible devices and industrial-grade circuit protection equipment, including:

Molded Case Circuit Breakers (MCCB) and Air Circuit Breakers (ACB): Designed for robust overload and short-circuit protection in high/low-voltage systems.
Active Harmonic Filters (AHF) and Static Var Generators (SVG): Effectively eliminate harmonics and stabilize voltage fluctuations, ensuring compliance with international power standards.
Intelligent Capacitors and Reactive Power Compensation Controllers: Optimize power factor correction, reducing energy losses by up to 30%.
Non-Contact Thyristor Switches and Microcomputer Protection Devices: Enhance system reliability with zero-arc switching and real-time fault detection.

Manufacturing Excellence: Technology-Driven Quality

Advanced R&D Capabilities: Collaborations with top-tier institutions like Shanghai Jiao Tong University and Zhejiang University fuel continuous innovation in power quality correction and circuit protection technologies.
State-of-the-Art Facilities: Equipped with fully automated production lines, smart mold centers, and intelligent testing systems, ensuring ISO-certified quality control.
Global Compliance: Products meet international standards, trusted in critical sectors such as marine engineering, renewable energy plants, and industrial automation.

Service Advantages: Tailored Solutions, Global Reach

End-to-End Support: From customized three-phase imbalance solutions to post-installation maintenance, our technical team provides 24/7 multilingual assistance.
Proven Track Record: Over 15 years of successful deployments across Europe, the Middle East, and Southeast Asia, with long-term stability in demanding environments like steel mills, airports, and solar farms.
Rapid Response Network: Localized warehouses and partnerships in key markets ensure timely delivery and cost-effective logistic