Circuit breakers can be wired in several ways: front panel, rear panel, plug-in, and drawer-type. Unless otherwise specified by the user, front panel wiring is the most common method.
1. Rear Panel Wiring: The biggest advantage of rear panel wiring is that it eliminates the need for rewiring when replacing or repairing the circuit breaker; only the upstream power supply needs to be disconnected. Due to its unique structure, the product is shipped with a dedicated mounting plate, mounting screws, and wiring screws as designed. It is crucial to note that the reliability of the contacts in a large-capacity circuit breaker directly affects its normal operation; therefore, installation must be carefully performed according to the manufacturer's requirements.
2. Plug-in Wiring: A circuit breaker mounting base is installed on the mounting plate of the complete unit. The mounting base has six plugs, and the circuit breaker's connection plate has six sockets. The mounting base has a connection plate on its surface or bolts on the back. The mounting base is pre-connected to the power and load lines. During use, the circuit breaker is directly plugged into the mounting base. If the circuit breaker fails, simply remove the faulty one and replace it with a working one. Its replacement time is shorter and more convenient than front-panel or rear-panel wiring. Since plugging and unplugging require some manual labor, the frame current of plug-in products in China is limited to a maximum of 400A. This saves maintenance and replacement time. When installing a plug-in circuit breaker, check that the plug is securely pressed and tighten the circuit breaker to reduce contact resistance and improve reliability.
3. Drawer-type wiring: The drawer of the circuit breaker is accessed by rotating a lever clockwise or counterclockwise. A plug-in structure is used in both the main and secondary circuits, eliminating the isolator required for fixed circuits, achieving dual-purpose functionality, improving economic efficiency, and greatly facilitating operation and maintenance, while increasing safety and reliability. In particular, the main circuit contact base of the drawer is compatible with the contact base of NT-type fuses.
