Plastic-case circuit breaker vs. Microcircuit breaker: The twin of protecting circuit safety

Plastic-case circuit breaker (MCCB) and micro-circuit breaker (MCB) are common circuit protection devices in low-voltage distribution system, they are like the guard of the circuit safety of the two male, each perform their duties, and jointly ensure the safe and reliable operation of the power system. However, there are some significant differences between the two:

1. Appearance and size

Moulded case circuit breakers (LQM1 and LQM3) : Large, usually modular design, can be easily combined and expanded.

Miniature circuit breaker (LQB1 series) : small size, usually installed on the guide rail of the distribution box, saving space.

Second, rated current and segment capacity

Plastic-case circuit breaker: The rated current range is wide, usually from tens of amps to thousands of amps, and the segmented capacity is also strong, which can cut off a large short circuit current.

Miniature circuit breaker: The rated current range is small, usually from a few amps to more than one hundred amps, the segmentation capacity is relatively weak, suitable for small current circuits.

Three, protection function

Plastic case circuit breaker: with overload protection, short circuit protection, undervoltage protection and other protection functions, can also be equipped with leakage protection module and other accessories, to achieve more comprehensive protection.

Micro circuit breaker: mainly provides overload protection and short circuit protection, the function is relatively single.

Iv. Application scenarios

Plastic-case circuit breaker: suitable for industrial, commercial, civil buildings and other occasions of the main distribution system and branch circuit protection, often used to protect motor, transformer and other high-power equipment.

Miniature circuit breaker: suitable for civil buildings, lighting distribution box and other occasions of terminal circuit protection, often used to protect lighting, sockets and other low-power equipment.

5. Price and maintenance

Plastic-case circuit breaker: The price is relatively high, the maintenance is relatively complex, and the operation needs professional personnel.

Miniature circuit breaker: The price is relatively low, the maintenance is simple, and the user can replace it by himself.

Select the right circuit breaker:

For high-current circuits and high-power equipment, plastic-case circuit breakers should be selected.

For small current circuits and small power devices, you can choose a micro circuit breaker.

I hope the above information can help you better understand the difference between mould-case circuit breakers and micro circuit breakers, and choose the right circuit breaker. Choose our CNLonQcom products to protect your circuits. If you want to consult more, welcome to consult (sale@nijanienergy.com), we will be dedicated to serve you.