Explore our premium range of high-voltage DC surge protectors, smart leakage switches, and advanced miniature circuit breakers engineered for solar PV and industrial applications.
Engineered for medium voltage applications, providing robust lightning and surge protection for sensitive industrial equipment.
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Features a 40kA maximum discharge capacity, ideal for high-performance solar photovoltaic installations.
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Designed for ultra-high voltage DC systems with a 40kA maximum discharge current for ultimate safety.
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Premium 20kA SPD engineered for ultra-high voltage lightning protection in utility-scale solar farms.
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Reliable 40kA discharge capacity surge protector designed for commercial three-phase DC networks.
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Smart 2P 63A leakage protection switch with remote monitoring and automatic recovery capabilities.
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High-performance 20kA SPD optimized for high-voltage DC system lightning protection.
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Advanced lightning and electronic equipment protection for medium-scale solar power arrays.
View Product DetailsIn low-voltage electrical distribution, the choice of circuit protection is critical to ensuring operational continuity, system reliability, and human safety. While single-pole and double-pole circuit breakers are standard in simple single-phase networks, modern industrial, commercial, and renewable energy systems demand more comprehensive solutions. This is where the 4 Pole Miniature Circuit Breaker (MCB) becomes indispensable.
A 4 Pole MCB provides simultaneous overcurrent and short-circuit protection across three phase conductors (L1, L2, L3) and the neutral conductor (N). In three-phase systems with unbalanced loads or significant harmonic distortions (common in modern facilities with extensive LED lighting, variable frequency drives, and IT equipment), neutral currents can rise unexpectedly. A dedicated neutral pole ensures that the neutral line is safely monitored and disconnected alongside the phase lines during a fault condition, preventing dangerous neutral voltage rises and potential equipment damage.
Furthermore, international standards such as IEC 60364 require complete isolation of all active conductors—including the neutral—in specific earthing systems (like TT and IT networks) during maintenance or fault isolation. Zhejiang Shuorui Electric Co., Ltd. designs and manufactures high-performance 4 Pole MCBs that meet these stringent global standards, ensuring seamless integration into complex power distribution networks.
As global energy systems transition toward digitalization and sustainability, low-voltage protection devices are undergoing rapid technological evolution.
Traditional thermal-magnetic MCBs are evolving into intelligent, connected devices. Integrated microprocessors and communication protocols (such as Modbus, Zigbee, or WiFi) enable real-time monitoring of current, voltage, temperature, and power consumption, paving the way for predictive maintenance and remote control.
Leading manufacturers are shifting toward halogen-free, recyclable thermoplastics for MCB housings. This reduces environmental impact and ensures compliance with global green initiatives like RoHS and REACH, without compromising on flame-retardant capabilities.
With the rise of localized power generation (solar PV, wind, energy storage), short-circuit levels in distribution networks have increased. Modern 4 Pole MCBs are engineered to deliver higher breaking capacities (up to 10kA or 15kA) within compact DIN-rail form factors.
For international procurement managers, sourcing electrical components from China is no longer just about cost reduction—it is about securing a resilient, agile, and technologically advanced supply chain partner. Zhejiang Shuorui Electric Co., Ltd., located in Liushi, Wenzhou (the electrical capital of China), sits at the heart of the world's most integrated electrical manufacturing cluster.
This strategic location allows us to leverage an unparalleled ecosystem of raw material suppliers, specialized component manufacturers, and logistics networks. We address key procurement pain points by offering:
1. Uncompromising Quality Control: From raw material inspection to automated end-of-line testing, every single MCB undergoes rigorous calibration and testing to ensure compliance with international standards such as CE, CB, and ISO9001.
2. Flexible OEM/ODM Capabilities: Whether you require custom tripping curves (B, C, or D), specialized terminal configurations, or private labeling, our dedicated R&D team can accelerate your time-to-market.
3. Regulatory Compliance & Certification Support: We provide complete documentation, test reports, and certificates required for smooth customs clearance and local market compliance worldwide.
Our 4 Pole MCBs and electrical protection systems are deployed across diverse sectors to ensure safety and operational continuity.
Ensuring safe power distribution in high-density commercial spaces, protecting HVAC systems, lighting networks, and server rooms from overloads and phase imbalances.
Providing robust DC and AC side protection in solar inverters, combiner boxes, and battery energy storage systems (BESS) operating under extreme environmental conditions.
Protecting sensitive PLCs, motors, and automated assembly lines from electrical faults, minimizing costly downtime and ensuring operator safety.
Our commitment to engineering excellence and global service is reflected in our operational milestones.
At Zhejiang Shuorui Electric Co., Ltd., we believe that innovation is the cornerstone of sustainable growth. Our technical roadmap focuses on integrating advanced digital technologies with traditional electrical safety hardware. By embedding micro-sensors within our 4 Pole MCBs, we are developing next-generation devices capable of detecting micro-arcs (Arc Fault Detection Devices - AFDD) and transient overvoltages before they escalate into electrical fires or system failures.
Additionally, we are actively expanding our smart home and industrial IoT portfolios. Our WiFi-enabled intelligent reclosing protectors and leakage switches represent the first phase of this transition, allowing users to monitor, diagnose, and reset circuits via cloud-based platforms. As smart cities and microgrids continue to expand, Shuorui Electric is committed to delivering the intelligent protection systems required to keep the world safely connected.
A modern enterprise integrating R&D, production, and sales, committed to providing high-quality electrical solutions.
Zhejiang Shuorui Electric Co., Ltd. is located in Liushi, Wenzhou, Zhejiang, the electrical capital of China. It is the core area of the electrical industry and gathers many excellent electrical companies and rich industry resources. As a modern company integrating R&D, production and sales, Shuorui Electric is committed to providing customers with high-quality electrical products and solutions. The company always adheres to the business philosophy of "the most cutting-edge technology, the best quality, the most sincere service, and the most favorable price", striving to maintain a leading position in the fierce market competition.
In the production process, Shuorui Electric strictly controls every link, from the purchase of parts to the delivery of the whole machine. We have established strict quality inspection standards and introduced advanced production equipment to ensure every product meets international standards.
Our comprehensive product line covers miniature circuit breakers (MCB), residual current circuit breakers (MCCB), surge protectors (SPD), smart control boxes (SCB), photovoltaic connectors, disconnectors, AC contactors, and smart remote control switches.
We provide fully customizable solutions tailored to your specific market requirements. From custom enclosures and branding to specialized electrical parameters, our engineering team is equipped to deliver bespoke products.
Take a virtual tour of our state-of-the-art workshop, dedicated team, and advanced production machinery.
Get professional answers to the most common technical and procurement questions regarding 4 Pole MCBs.
High-quality AC contactors, photovoltaic DC miniature circuit breakers, and advanced surge protectors engineered for maximum reliability.
Reliable AC contactor designed for motor control and household electrical applications.
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Advanced 20kA SPD designed for ultra-high voltage DC systems and solar arrays.
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Providing advanced overvoltage protection for commercial high-voltage DC systems.
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Features a 40kA maximum discharge capacity for mid-range solar PV installations.
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High-efficiency 20kA SPD optimized for high-voltage DC distribution systems.
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Engineered for medium voltage DC systems, delivering reliable transient protection.
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Delivers a low ≤4.0kV protection level (Up) for sensitive electronic components.
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Compact design engineered for space-constrained low-voltage DC applications.
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