A power distribution cabinet typically includes a main switch, circuit breakers, contactors, transformers, and controllers.
Main Distribution Switch
The main distribution switch, also known as the master switch, is responsible for controlling and distributing electrical energy. It can directly cut off the power supply to the entire circuit, possessing a strong power-off capability. Furthermore, in the event of a circuit fault, the main distribution switch can promptly stop the power output, ensuring the safety of electrical equipment and personnel.
Circuit Breaker
Circuit breakers are primarily used for overcurrent and short-circuit protection, functioning similarly to fuses. However, because circuit breakers are reusable, they are widely used. Circuit breakers can typically disconnect a circuit rapidly within tens of milliseconds, protecting related electrical equipment from damage.
Contactor
Contactors are primarily responsible for switching control, achieving switching actions by controlling the opening and closing of an electromagnetic coil. Their design typically includes two parts: "contacts" and an "electromagnetic coil." When the electromagnetic coil receives a control signal, the contacts open or close, thus switching the circuit.
Transformer
Transformers can transfer electrical energy from one circuit to another, typically used for voltage step-up/step-down or power transmission. In power distribution cabinets, transformers are mainly used to control the voltage and current of cable lines.
A controller is an automated system used to monitor and control equipment, enabling the operation of electrical equipment in a pre-set manner. In a power distribution cabinet, the controller typically monitors the current and voltage of the cabinet, enabling functions such as automatic control and fault detection.
