Mini MCB Miniature Circuit Breaker

The Mini MCB Miniature Circuit Breaker is an automatically operated electrical switch designed to protect electrical circuits from damage caused by overloads or short circuits. It is capable of switching on, carrying and breaking current under normal circuit conditions, as well as switching on, carrying for a certain period of time and breaking current under specified abnormal circuit conditions.

Model:STM14-63

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Product Description

Model	STM14-63
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)	1,2,4,6,10,16,20,25,32,40,50,63A
Rated Voltage(Un)	AC230(240)/400(415)V
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

Features and Advantages

Small size: Mini MCB Miniature Circuit Breaker is characterized by small size and light weight, which is easy to install and use.

Reliable operation: Its internal structure and materials are well-designed to ensure that the power supply is cut off quickly when there is an overload or short-circuit in the circuit to protect electrical equipment and personal safety.

Widely used: It is widely used in residential, commercial buildings and industrial facilities as the most commonly used terminal protection appliance in building electrical terminal distribution devices.

Principle of operation

The Mini MCB works on the principle of short-circuit and overload protection by monitoring the current. When a short-circuit fault occurs in a circuit, the MCB will immediately disconnect the circuit to prevent excessive current from causing fire and other safety incidents. When there is an overload in the circuit, the MCB will delay disconnecting the circuit for a certain period of time to protect electrical equipment from damage. In addition, some Mini MCBs have an over-voltage protection function that cuts off the circuit when the voltage is abnormal (too high) to prevent damage to electrical equipment.

Types and Options

Mini MCBs are available in a variety of types to meet the needs of different electrical systems. Common types include:

Standard: Typically used in residential and commercial buildings with parameters such as rated current range, rated voltage, short-circuit disconnect capacity and number of poles.

Isolated: Can completely isolate the power source and load for safe maintenance of electrical systems.

Segmented circuit type: Within the rated current range, the disconnect function of the MCB can be switched to maintain the energized state of part of the circuit.

Residual current type: Also known as leakage protection switches, they are capable of detecting leakage faults in circuits and automatically cutting off the power supply.

Overload protection type: capable of detecting excessive current and cutting off power to protect electrical equipment and wires.

Multi-function type: integrates a variety of functions, such as overload protection, short-circuit protection, and leakage protection.

Control type: Allows the operator to manually open or close the circuit for electrical equipment control.

When selecting Mini MCBs, factors such as rated voltage, rated current, breaking capacity, operating characteristics and environmental conditions need to be considered. It is also necessary to select the appropriate type of MCB according to the specific circuit and load requirements.

Mini MCB Miniature Circuit Breaker