1) Indirect contact protection in case of power arrester failure, i.e. mini-circuit breakers, must be designed to safely remove the failed arrester from the low-voltage system within the required time.
2) Cut off excessive power supply for continuous current. This is especially important for Class B power arresters installed at the junction of LPZO and LPZ1. In order to ensure the high nominal discharge capacity of the arrester, taking into account the electrical and mechanical strength when discharging the lightning current, B-class power arrester is almost all spark gap type. Thus, after the lightning interference, the 50 Hz power supply continuation generated by the spark gap arrester must be safely extinguished. This power supply continuation can be as large as the expected short circuit current at the installation of the lightning current arrester (Class B). If the expected short circuit current exceeds the arrester's power frequency continuation extinguishing capability, the power frequency continuation must be cut off by the mini-breaker at the front of the arrester. Therefore, the short-circuit current of the mini-circuit breaker installed in the front end of the B arrester should be as large as possible.
There are many ways to connect circuit breakers Plastic Breaker Db Box, but the main ones are front board, back board, plug-in type and drawer type. This method of board is the most used, because it is more convenient, it is exposed outside, it is very simple when it needs to be disassembled, and the user can also see it in normal work, so most users will Adopting this wiring method in front of the board is convenient and fast, saving money and effort.
This wiring method behind the board is also very easy to accept. It has a big feature that if the user needs to replace the circuit breaker, or when the circuit breaker has a problem, there is no need to re-wiring, first understand the circuit breaker model. You only need to change the circuit breaker on the original basis, and its fixedness is relatively strong, and it is a bit weaker compared with the wiring on the front of the board. If the user needs wiring on the back of the board, the manufacturer will provide various tools.
For household circuit breakers, the selectivity of plug-in wiring is relatively small, because it is more troublesome and there is no need in this regard. The factory generally adopts this method to facilitate the control of the operation of the circuit breaker, and sometimes it is necessary to turn off the circuit breaker. , Then it will be more convenient to choose the plug-in type. It needs to install a socket in the installation position, and then install the wiring facilities through the socket, which will be more troublesome in construction.
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