The use of plastic case circuit breakers is becoming more and more widespread today and I don't know if you usually pay any attention to them. Some customers say that they fail soon after buying these, but it is a real nuisance when such a problem arises. In fact, there are only two reasons for this situation. The first reason is that the quality of the product people buy is not important. Maybe to save money, I bought a product of substandard quality. The second reason is that they do not understand the environment and maintenance methods of the moulded case circuit breaker, thus greatly shortening the life of the machine.

It is important to know that plastic case circuit breakers have requirements for ambient temperature and humidity, the ambient air temperature cannot exceed 40 degrees Celsius, so it must be controlled within this range. The minimum temperature must not be below -5 degrees Celsius and the average temperature must not exceed 35 degrees Celsius. This temperature value is really important. Otherwise, the use of the moulded case circuit breaker may be affected. For atmospheric requirements, the relative humidity should not exceed 40 degrees Celsius to 50%. With low temperatures, the humidity can be relatively high, but the average humidity per month must not exceed 90%.

The contact 90 of the moulded case circuit breaker relies on manual operation. Of course, if you think manual is a hassle, you can try using an electrical closure, which is also available. The free tripping mechanism locks the main contact in place after it has been closed. After the tripped coil has been connected to the hot tripping element and the main circuit, the machine starts to work. Only if the user fully understands the working principle can he know how to operate and manage the machine.

Normally when using a moulded case circuit breaker, if a circuit is found to be short-circuited or severely overloaded, at this point the energised tripper can perform armature inhalation, with the need to be aware that a free tripping mechanism occurs, resulting in a break in the main circuit. If the circuit is overloaded, the thermal element will bend and the main circuit will be interrupted. Under-voltage dehydrators are released when there is insufficient voltage in the circuit.

The procedure for using a moulded case circuit breaker is now very simple. If you buy a product of guaranteed quality, you will not have to worry at all about subsequent operation. In fact, wherever it can be used, the operator is more familiar with the machine. There is no need to worry about problems arising during use. It can be repaired according to the instructions, and if it is done wrong, it can be repaired directly by an expert. Wouldn't it be better to not let the user take risks with such a machine anyway?