Low-voltage circuit breakers–MCCB

1.What is the MCCB ?

Molded case circuit breakers can automatically cut off the current after the current exceeds the trip setting. Plastic case refers to the use of plastic insulators as the outer casing of the device to isolate the conductors and the grounded metal parts. Molded case circuit breakers typically contain a thermal-magnetic trip unit, while larger models are equipped with solid-state trip sensors. The trip unit is divided into: thermal magnetic trip and electronic trip. Commonly used rated currents are as follows: 16, 25, 30, 40, 50, 63, 80, 100, 125, 160, 200, 225, 250, 315, 350, 400, 500, 630A.

2. Feature of  MCCB ?

2.1: Comply with GB14048.2008 standards;

2.2: Rated insulation voltage:800V;

2.3: Frame size rated current:63A; 100A; 225A; 400A; 630A; 800A;

2.4: High breaking capacity: up to 100kA;

2.5: Reasonable design, safe and reliable, samll size, light weight, beautiful appearance;

2.6: Accessories everything, quick installation, easy to use, strong applicability.

3.How MCCB works ?

The main contacts of the low-voltage circuit breaker are closed manually or electrically. After the main contact is closed, the free trip mechanism locks the main contact in the closed position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply.

When the circuit is short-circuited or severely overloaded, the armature of the overcurrent release is pulled in to make the free release mechanism act, and the main contact disconnects the main circuit.

When the circuit is overloaded, the heating element of the thermal release will bend the bimetal, push the free release mechanism to act, and the main contact will disconnect the main circuit.

When the circuit is under-voltage, the armature of the under-voltage release is released, which also makes the free trip mechanism act, and the main contact disconnects the main circuit.

When the shunt tripping button is pressed, the armature of the shunt tripper pulls in, making the free trip mechanism act, and the main contact disconnects the main circuit

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