From foundation to innovation: Revealing the core strength of Zheliang Electric's independent plastic-case circuit breaker

In industrial plants, commercial buildings and even home electricity scenarios, a thumb-sized device can cut off fault current in a thousandth of a second, avoiding fire and equipment damage - it is the Molded Case Circuit Breaker (MCCB), It is an indispensable core protection in the low-voltage distribution system, and its role is equivalent to the "fuse" in the circuit system, which can not only automatically cut off the faulty power supply, but also restore the power supply after lifting the anomaly, which is the first line of defense to ensure the safety of electricity and extend the life of the equipment!

So what are the basic functions of Molded Case Circuit Breaker (MCCB)?

1. Overload protection

When the line current exceeds the rated value due to equipment overload operation (such as motor start-up, multiple devices in parallel), but does not reach the short circuit current, the bimetal sheet in the circuit breaker will trigger the trip due to heat bending, and cut off the circuit in a few seconds to avoid continuous overheating of the line and cause fire.

2. Short circuit protection

If the line is suddenly short-circuited due to insulation damage, equipment failure, etc. (the current surges to thousands of amps in an instant), the electromagnetic coil of the circuit breaker will generate a strong magnetic field, which will push the mechanical mechanism to complete the breaking within 0.02 seconds to prevent the arc from burning the equipment or causing an electrical explosion.

Different from disposable fuses, mould-case circuit breakers can be flexibly opened and closed through the handle, which is convenient for physical isolation of power supply during line maintenance. At the same time, remote electric operation (optional module) is supported to meet the requirements of intelligent power distribution.

From the above functions, we can conclude that MCB is a "safety net" covering the whole field, so plastishell circuit breakers are frequently used in the industrial field, buildings and new energy and new infrastructure, in the scenario of high energy consumption, plastishell circuit breakers need to withstand the impulse current of the motor frequent start and stop, to protect the inverter, PLC and other precision equipment from voltage fluctuations. In normal floors, the distribution system relies on circuit breaker level protection (such as 600A at the upper level and 250A at the lower level) to ensure that local failures do not spread to the entire grid and maintain uninterrupted power supply in critical areas.

The LZAM1 series circuit breaker developed by our company is mainly suitable for 50Hz/60Hz, rated impulse withstand voltage 12kV, rated insulation voltage 1000V, rated operating voltage 400V(690V) and below, rated current 1600A and below in the distribution network. Used to distribute power and protect lines, power supplies and electrical equipment from undervoltage, overload and short circuit hazards, improve the reliability of power supply. Under normal conditions, it can be used as the infrequent conversion of the line and the infrequent start of the motor, and has the characteristics of small volume, high breaking capacity, short arc distance, etc., which is the ideal product for users.

In the face of increasingly complex electricity environment, Zheliang Electric relies on 23 years of power device research and development experience, from the three dimensions of material innovation, structural design, intelligent Internet of things to rebuild the plastico-case circuit breaker, launched a new generation of solutions - LZAM1, to "faster, stronger, more intelligent" to respond to industry challenges.