Principles of Low voltage distribution box and why thermal management is necessary?

2025-10-16 11:00:45

Low voltage distribution box play a crucial role in power generation, transmission, distribution, energy conversion, and consumption in the power system, including on/off, control, or protection. They are an important component of the power transmission and transformation equipment manufacturing industry and hold a very important position in the entire power industry.

There are various types of Low voltage comprehensive distribution box with different functions in different situations, and traditional ones mainly use various contactors, current protectors, relays, etc.

The core device of AC distribution box is the frequency converter. The speed of a motor mainly depends on the power supply frequency. Asynchronous motors have a small slip rate, and the speed is basically proportional to the power supply frequency, while synchronous motors are strictly proportional to the power supply frequency. By adjusting the output frequency of the frequency converter, the speed of the motor can be changed.

Most electronic components generate heat during operation, and when these components are enclosed and placed in an external environment, their reliability and lifespan will be compromised. The occurrence of faults can lead to equipment shutdown and cause losses to customers. For this reason, many enclosed buildings are equipped with ventilation devices or refrigeration units to remove heat and control the environment inside the building. The main causes of electronic device malfunctions are 55% from ambient temperature and 25% from dust and humidity. Refrigeration machines can effectively control the temperature and humidity of Low voltage distribution box and resist external dust.