The wiring modes of low-voltage drawer cabinet circuit breaker include front board, back board, plug-in type and drawer type. If users have no special requirements, they all supply according to the front board. The front board wiring is a common wiring mode.
Wiring mode behind the board
The feature of the back board wiring is that the circuit breaker can be replaced or repaired without rewiring, and only the front power supply can be disconnected. Due to the special structure, the product has been equipped with special mounting plate, mounting screw and wiring screw according to the design requirements. It should be noted that the contact reliability of the large capacity circuit breaker will directly affect the normal use of the circuit breaker, so attention must be paid to the installation, and the installation must be carried out in strict accordance with the requirements of the manufacturer.
Plug in connection
On the installation board of the complete set of device, a circuit breaker installation base is installed first, with 6 plugs on the installation base and 6 sockets on the connecting board of the circuit breaker. There is a connecting plate on the surface of the mounting base or a bolt behind the mounting base, and the mounting base is connected with a power line and a load line in advance. When in use, insert the circuit breaker directly into the mounting base. If the circuit breaker is broken, just pull out the broken one and replace it with a good one. Its replacement time is longer than the wiring before and after the board
Short and convenient. Because it needs a certain amount of manpower to plug and pull. Therefore, at present, the shell current of plug-in products in China is limited to 400A. Thus, the maintenance and replacement time is saved. When installing the plug-in circuit breaker, it is necessary to check whether the plug of the circuit breaker is tightly pressed, and the circuit breaker should be securely fastened, so as to reduce the contact resistance and improve the reliability.
Drawer type wiring
The in and out drawer of the circuit breaker is rotated clockwise or anticlockwise by the rocker. The plug-in structure is adopted in the main circuit and the secondary circuit, and the necessary isolator for the fixed type is omitted. One machine is used for two purposes, which improves the economy of use, brings great convenience to operation and maintenance, and increases the safety and reliability. In particular, the main circuit knife contact base of drawer base can be used in common with NT type fuse knife contact base, so that the fuse can be directly inserted for power supply in case of emergency. In conclusion, due to the different voltage levels and AC and DC power supply of shunt release, undervoltage release, electric operating mechanism and locking electromagnet, the user should explain them when ordering. At the same time, it is impossible for the user to use a single accessory when selecting. If two circuit breakers are required to be electrically interlocked (when one is closed, the other must be opened), the auxiliary contact and opening contact can be selected For the excitation release or electric operating mechanism, the screw must be tightened when wiring in front of and behind the board, so as to avoid burning the circuit breaker.