Here to tell you, whether it is a molded case circuit breaker or isolation circuit breaker, it is necessary to contact with electricity all year round. However, electricity is a double-edged sword and can easily injure people if not used. In order to reduce accidents and ensure personal safety, it is necessary to understand the considerations for MCCB installation and maintenance.

Moulded Case Circuit Breakers are used to distribute electricity and protect lines and electrical equipment from overloads, short circuits, undervoltage and other faults. Let us first understand the precautions to be taken during installation, use and maintenance, as follows:

1, before installation, must be carried out to check the parameters on the nameplate and the actual economic development process needs to be matched by whether we can request ourselves, the circuit breaker will be fixed vertically on a system mounting plate.

2, in front of the circuit board wiring, choose the appropriate cross-section of wire, peel off the appropriate length of insulating outer layer, inserted into the hole of the winding coil, compress the outer layer of the winding coil, the wire firmly wrapped. Then, fasten the connecting hole of the wire coil with the terminal of the circuit breaker with screws. When connecting the copper strip, the terminal block should be fixed to the circuit breaker first and then secured with the copper strip. The wiring behind the circuit board should be fixed to the terminal block in strict accordance with the specification.

Before using the circuit breaker, the trainees should carefully check whether the fixed connection part is firm to ensure that the system operation management mechanism is in a flexible state.

4, the circuit breaker factory need us to determine an accurate and reasonable in use can be arbitrarily by adjusting the system function. Line design problems did not occur information overload or short-circuit fault circuit breaker action, should first exclude the emergence of faults, and then close the operation.

5, circuit breakers in the process of use should be regularly checked, the transmission part should be regularly added lubricating oil, while the shell should be cleared of dust, and remove metal particles and black smoke on the interrupter chamber walls and side panels.

Next, what are the general requirements for the use, installation, storage and transportation of plastic case circuit breakers?

Moulded case circuit breakers are mainly used for overload, undervoltage and short-circuit protection of distribution lines and power supply equipment in distribution networks with AC 50Hz-60Hz, rated isolation voltage of 800V, rated operating voltage of 690V and below, rated current of 1250A and below. The frame rating of 400 A and below can also be used for motor overload, undervoltage and short-circuit protection for intelligent low-voltage circuit breakers. Under normal conditions, it can be used as infrequent switching of lines and infrequent starting of motors.

I. Normal working environmental conditions for the use of moulded case circuit breakers

1. The upper limit of ambient air temperature shall not exceed 40 degrees Celsius, the lower limit shall not be lower than -5 degrees Celsius, and the average value within 24 hours shall not exceed 35 degrees Celsius.

2. The installation workplace, in the case of different altitudes, must not exceed 2000m.

3. The relative humidity of the atmosphere at the highest ambient temperature is +40°C and not more than 50% at the isolation circuit breaker; it can have a higher relative humidity at lower temperatures, for example 90% at 20°C, taking into account condensation on the product surface due to temperature changes.

II. Normal installation conditions

Installation working conditions: installation should normally be carried out vertically, moulded case circuit breakers can also be installed horizontally as well as horizontally (horizontal installation).

Installation category: circuit breaker main circuit is class 3; control circuit and auxiliary circuit is class 2.

Pollution class: Class 3.

Normal storage and transport conditions

1. Lower temperature limit not lower than -25°C, upper limit not higher than +55°C.

2. The relative ambient humidity (at 25°C) should not exceed 95%.

3. The product should be handled lightly during transport, not inverted, and serious collisions should be avoided as far as possible.