DC Miniature Circuit Breaker

PUGAO DC Miniature Circuit Breaker is a dedicated protection device for DC power applications, including solar PV arrays, energy storage systems, and industrial DC cabinets. Unlike AC circuit breakers, DC MCBs require specialized arc interruption technology because DC current does not naturally pass through zero. The product series provides multiple pole configurations from 1P to 4P, allowing engineers to select suitable isolation methods according to system voltage and wiring requirements.

With the rapid development of photovoltaic generation, battery storage, and DC-powered industrial equipment, reliable protection on DC circuits has become increasingly important. PUGAO DC Miniature Circuit Breaker is developed specifically for these applications, providing circuit isolation and fault protection for DC systems where continuous current interruption capability is required.

Different from conventional AC miniature circuit breakers, DC MCBs face higher arc extinguishing requirements during fault interruption. The PUGAO DC Miniature Circuit Breaker adopts an optimized internal contact structure and arc extinguishing system to improve fault interruption stability under DC conditions.

The product family includes 1P, 2P, 3P, and 4P configurations. Single-pole models are suitable for compact DC branch circuits, while multi-pole versions allow simultaneous disconnection of multiple conductors in photovoltaic strings, battery systems, and high-voltage DC distribution cabinets.

The series supports rated current up to 63A, DC voltage ratings up to 1000V, and complies with IEC60898-2 and GB/T10963.2 standards. It is suitable for solar photovoltaic systems, energy storage cabinets, communication power supplies, and industrial DC control applications.

Product Specifications

Features

Dedicated DC Circuit Protection Structure

DC circuits maintain continuous current flow during interruption, making arc extinguishing more challenging than AC applications. PUGAO DC Miniature Circuit Breaker uses a dedicated DC contact structure and arc extinguishing chamber to improve the ability to interrupt abnormal current conditions.

This design is suitable for photovoltaic strings, battery circuits, and industrial DC distribution systems where stable fault interruption is required.

Multiple Pole Configurations for Different System Designs

The DC Miniature Circuit Breaker series provides different pole combinations to match various DC circuit architectures.

The 1P configuration is designed for compact branch protection where only one conductor requires switching protection. It is commonly used in smaller DC power circuits and control systems.

The 2P configuration enables simultaneous disconnection of positive and negative conductors, providing complete polarity isolation for photovoltaic modules and battery storage circuits.

The 3P and 4P configurations are suitable for higher-voltage DC systems where multiple conductors require coordinated switching and isolation.

C Curve Protection for General DC Loads

The PUGAO DC Miniature Circuit Breaker adopts a C curve trip characteristic, providing balanced protection for common DC loads.

The thermal release mechanism responds to long-duration overload conditions, preventing excessive current from damaging cables and connected equipment.

The electromagnetic release mechanism reacts quickly during short-circuit faults, disconnecting the circuit to reduce the impact on downstream components.

Voltage Options Covering Solar and Storage Applications

Different pole structures allow the DC MCB to adapt to different system voltage requirements.

Compact DIN Rail Installation

The modular housing design allows direct installation on standard 35mm DIN rails.

The compact structure helps optimize space inside photovoltaic combiner boxes, battery cabinets, and industrial control panels.

The visible handle position provides clear ON/OFF status indication, allowing operators to quickly identify circuit conditions during inspection.

Stable Electrical Performance

The internal conductive system is designed for repeated switching operation under DC conditions.

The reinforced housing material provides mechanical strength and insulation protection, while the internal arc extinguishing components support reliable interruption performance during overload and short-circuit events.

Working Principle

Overload Protection

When the DC circuit operates above the rated current for an extended period, the thermal release element gradually heats and activates the trip mechanism.

The circuit breaker disconnects the power path to protect conductors and electrical equipment from overheating caused by continuous overload.

Short Circuit Protection

When a short circuit occurs, the electromagnetic trip mechanism responds rapidly to the sudden increase in fault current.

The contacts separate quickly, while the arc extinguishing structure limits arc energy and interrupts the DC fault current.

Applications

Solar Photovoltaic Systems

PUGAO DC Miniature Circuit Breaker is used on photovoltaic DC circuits between solar modules, combiner boxes, and inverter systems.

Different pole configurations allow system designers to select suitable protection methods according to array voltage and wiring structure.

Battery Energy Storage Systems

Battery storage systems require reliable DC isolation during installation, maintenance, and fault handling.

The 2P, 3P, and 4P configurations provide synchronized disconnection options for different battery voltage levels and cabinet designs.

Industrial DC Distribution

Industrial automation, communication equipment, and control systems increasingly use DC power supplies.

The compact DIN rail structure allows the DC MCB to be integrated into industrial electrical cabinets while providing overload and short circuit protection.

Communication Power Systems

DC power supply systems used in communication infrastructure require stable branch circuit protection.

The product supports compact installation and reliable switching for DC distribution applications.

DC MCB Selection Guide

Selecting the correct DC Miniature Circuit Breaker depends on system voltage, current rating, and conductor configuration.

For compact low-voltage DC circuits, 1P models provide basic branch protection.

For photovoltaic and battery circuits requiring positive and negative isolation, 2P models are commonly selected.

For higher-voltage DC systems, 3P and 4P configurations provide coordinated multi-conductor disconnection.

The selected DC circuit breaker must match the actual system voltage because DC interruption requirements are different from AC protection devices.

Factory Capability

PUGAO is a low-voltage electrical equipment manufacturer based in Zhejiang, China.

The production system integrates plastic injection molding, metal component processing, assembly, and electrical testing to control key manufacturing processes internally.

For DC Miniature Circuit Breaker production, inspection covers electrical performance testing, overload characteristics, short circuit interruption performance, insulation inspection, and mechanical operation testing.

With ISO9001 quality management system certification and intellectual property management system certification, PUGAO maintains production traceability from component processing to finished product inspection.

The factory supports OEM production, customized branding, packaging development, and overseas distribution supply.

OEM Customization

PUGAO provides customized production services for electrical brands, distributors, and engineering projects.

Available customization options include:

Private logo marking on products;

Customized packaging design;

Rated current configuration;

Pole configuration adjustment;

Product documentation support.

The flexible production system allows standard DC MCB supply as well as customized DC protection product development.

Why Choose PUGAO DC Miniature Circuit Breaker

PUGAO DC Miniature Circuit Breaker is developed specifically for DC power environments rather than conventional AC distribution applications.

The product family covers different protection requirements from compact branch circuits to high-voltage photovoltaic and energy storage systems through multiple pole configurations.

With integrated manufacturing capability and dedicated electrical testing processes, PUGAO provides DC circuit protection products for renewable energy projects, industrial applications, and overseas electrical distribution markets.