DC Miniature Circuit Breaker

Zhejiang Dongan Electrical Co., Ltd. DC miniature circuit breaker (DC MCB) is a compact and reliable low-voltage electrical protection device designed for direct current circuits, providing overload, short-circuit, overvoltage, and undervoltage protection for various DC loads and systems. It is widely used in solar photovoltaic, battery energy storage, electric vehicle charging, data center, and industrial DC distribution scenarios, ensuring safe and stable operation of circuits and equipment.

Core Features

● Special Arc Extinguishing Design: Adopts special contact materials and arc-chamber structures to effectively extinguish DC arcs, solving the problem of difficult arc interruption in DC circuits and ensuring safe circuit breaking.

● Dual Protection of Thermal and Magnetic Release: The thermal element responds to sustained overloads, and the magnetic element acts on high short-circuit currents, providing fast and reliable protection for DC circuits.

● Multiple Tripping Curves: Supports Type B, Type C, and Type D tripping curves to adapt to different load types, from household resistive loads to industrial inductive loads and high-surge equipment.

● High Breaking Capacity: With breaking capacities up to 6kA or 10kA, it can quickly cut off fault currents and reduce line and equipment damage risks.

● Compact Structure & Easy Installation: Miniature size, compatible with standard DIN-rail mounting, and optional accessories (auxiliary contacts, shunt trip, etc.) for flexible system expansion.

● Polarity Options: Available in polar and non-polar designs to meet the needs of bidirectional current scenarios such as battery charging and discharging systems.

Product Categories

1. By Rated Current

● Small Current DC MCB: Rated current 1A–32A, suitable for household solar systems, small battery packs, and low-power DC equipment.

● Medium Current DC MCB: Rated current 32A–63A, applicable to medium-sized energy storage systems, EV charging piles, and industrial DC distribution lines.

● High Current DC MCB: Rated current 63A–125A, designed for large-scale energy storage stations, high-power DC distribution, and industrial heavy-load equipment.

2. By Rated Voltage

● Low Voltage DC MCB: Rated voltage 24V–250V DC, for household and small commercial DC systems.

● Medium Voltage DC MCB: Rated voltage 250V–1000V DC, suitable for solar PV, battery energy storage, and industrial medium-voltage DC distribution.

3. By Tripping Curve

● Type B DC MCB: Trips at 3–5 In, for resistive loads and low-surge household applications.

● Type C DC MCB: Trips at 5–10 In, for fluorescent lighting, small motors, and general commercial/industrial DC circuits.

● Type D DC MCB: Trips at 10–20 In, for highly inductive loads, UPS, and high-surge industrial equipment.

4. By Polarity

● Polar DC MCB: Standard polarity design, suitable for one-way DC circuits.

● Non-Polar DC MCB: No polarity limitation, ideal for battery charge/discharge systems and bidirectional DC circuits.

Application Scenarios

● Renewable Energy: Solar PV systems, wind power DC collection, and distributed energy storage projects.

● Energy Storage: Battery energy storage stations, household energy storage systems, and UPS power supplies.

● Transportation: EV charging piles, urban rail transit DC power supply, and electric vehicle auxiliary circuits.

● Data Centers & Telecom: 48V DC power distribution, server cabinets, and telecom base station backup power.

● Industrial & Household: Industrial DC equipment, household solar home systems, and low-voltage DC distribution lines.

Quality & Service

Zhejiang Dongan Electrical Co., Ltd. has over 30 years of experience in R&D and manufacturing, adhering to the quality policy of "science first, quality first". All DC MCB products comply with IEC/EN 60947 standards, with CE, CB, TUV, and CCC certifications, and pass ROHS 2.0 testing. Equipped with advanced automatic test lines, short-current test machines, overload test machines, and medium-speed punch presses, we ensure stable product performance and reliable quality. We provide customized production according to customer drawings or samples, with strict sample confirmation and efficient delivery, achieving win-win cooperation with customers worldwide.