Molded case circuit breakers, or MCCBs, are electrical protection devices used to protect the electrical circuit from excessive current, which can cause overloads or short circuits. Molded case circuit breakers can be used for a wide range of voltages and frequencies with adjustable trip settings.
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Molded circuit breaker is used to distribute electric energy and protect circuits and electrical equipment from overload or short circuit.
The power system requires a high degree of reliability. During operation, the system may have some abnormal conditions or may cause troublesome problems. Some of these situations are beyond control and cannot be avoided. Therefore, there is a need for an efficient device to detect such failure conditions and react immediately to minimize damage to the device. Molded case circuit breaker (MCCB) can help protect equipment. A molded case circuit breaker (MCCB) is a device that protects low-voltage power distribution systems from overloads and short circuits. Molded case circuit breaker allows quick reactivation of a circuit after clearing a short circuit or overload. MCCBs (molded case circuit breakers) can easily identify the difference between an overcurrent and a short circuit. It allows a slight overcurrent for a while, but turns on faster as the current level increases. MCCB can be used to complete protection and disconnection functions.
The main contacts of the molded case circuit breaker are manually operated or electrically closed. 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 trip 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.
The main difference between MCB and MCCB is their capacity. On the one hand, MCBs are rated at less than 100 amps and interrupted at less than 18,000 amps. Also, their trip characteristics may not be adjustable since they cater primarily to low circuits. MCCBs, on the other hand, provide amperage as low as 10 and as high as 2,500 as needed. Their breaking rates range from 10,000 to 200,000 amps. In addition, the MCCB has adjustable trip elements for more advanced models.
A circuit breaker is essentially a safety device for any property that uses electricity. These fixtures act as third parties in complex and dangerous electrical wiring systems. MCB and MCCB are circuit breakers. They are used in homes to prevent personal injury and electrical damage. These devices are designed to perform specific functions. It is their special features that make them special. The differences between molded case circuit breaker and air circuit breaker are following: