Control circuit on/off: By using switch devices such as circuit breakers and contactors, the on/off of each circuit is controlled, thereby achieving operation control of electrical equipment such as starting, stopping, and forward/reverse rotation. For example, the elevator's lifting and the operation and stop of the conveyor belt can be controlled through the power cabinet.

Protection circuits and equipment: equipped with various protection devices such as overload protection, short circuit protection, and undervoltage protection. When faults such as overload, short circuit, or abnormal voltage occur in the circuit, the protective device will quickly act to cut off the circuit, in order to prevent equipment damage, fire and other accidents, and protect the safety of personnel and equipment. For example, when the motor experiences overload operation, the thermal relay in the power cabinet will detect and cut off the power supply to the motor.

Monitoring power parameters: Power cabinets are usually equipped with ammeters, voltmeters, power meters, and other instruments to monitor the current, voltage, power, and other parameters in the circuit in real time, so that operators can understand the operating status of the power system, detect abnormal situations in a timely manner, and handle them.

Improving power supply reliability: Some power cabinets also have redundant design or backup power switching function. When the main power supply fails, it can automatically switch to the backup power supply to ensure the continuous power supply of important equipment and reduce losses caused by power outages. For example, power cabinets in important places such as operating rooms and communication base stations in hospitals will be equipped with backup power switching devices to ensure normal power supply even in the event of a power outage.