DC MCB Miniature Circuit Breaker

The DC MCB Miniature Circuit Breaker is an electrical switch specially designed for automatic operation in DC circuits. Its main function is to protect automatic devices from overloads, short circuits, and other fault hazards, and to ensure the safety of the entire power system. When the current flowing through the circuit exceeds the rating of the DC MCB, or when leakage current is detected in the circuit, the DC MCB will automatically disconnect the circuit, thus preventing the circuit from being damaged due to overload, short circuit, or leakage.

Model:STD11-125

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Product Description

Model	STD11-125
Standard	IEC60898-1
Pole	1P,2P,3P,4P
Tripping Curve	B,C,D
Rated Short-circuit capacity(Icn)	3KA,4.5KA,6KA
Rated Current(In)	1,2,4,6,10,16,20,25,32,40,50,63,80,100,125A
Rated Voltage(Ue)	DC 24,48,120,250,500,750,1000
Magnetic releases	B curve: between 3In and 5 In C curve: between 5In and 10In D curve: between 10In and 14In
Electro-mechanical endurance	over 6000 cycles

Principle of operation

The operating principle of the DC MCB Miniature Circuit Breaker is based on the thermal and electromagnetic effects of electric current. When a continuous overcurrent flows through a DC MCB, its internal bimetal is heated and deflected by bending, which releases the mechanical latch and cuts off the circuit. In addition, in the case of a short circuit, the sudden rise in current causes the plunger associated with the DC MCB's striker coil or solenoid to electromechanically displace, which triggers the trip mechanism to cut off the circuit.

DC MCB Miniature Circuit Breaker

Main Features

Special Arc Extinguishing and Current Limiting System: DC MCB adopts a special arc extinguishing and current limiting system, which is able to quickly break the fault current of DC distribution system and prevent the generation and spread of arc.

High sensitivity and fast response: DC MCB can detect small leakage currents and cut off the circuit in a very short time, providing instant protection.

Reusable: Unlike conventional fuses, the DC MCB can be reset manually or automatically after a trip, eliminating the need for replacement.

Multiple Current Ratings Available: DC MCBs are available in a variety of different current rating specifications.

Non-polarized and polarized: DC MCBs on the market are mainly categorized into polarized and non-polarized. Polarized DC MCBs need to pay special attention to the direction of current when connecting, while non-polarized DC MCBs can provide safety protection regardless of the direction of current flow.

Application Scope

DC MCBs are widely used where DC power protection is required, such as data centers, photovoltaic power generation systems, energy storage systems, and charging piles. Particularly in the energy storage market, where the direction of current is often bi-directional (charge/discharge mode), it is necessary to use non-polarized DC MCBs.

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