开关柜（switch cabinet）是一种电气设备，开关柜外线先进入柜内主控开关，然后进入分控开关，各分路按其需要设置。如仪表，自控，电动机磁力开关，各种交流接触器等，有的还设高压室与低压室开关柜，设有高压母线，如发电厂等，有的还设有为保主要设备的低周减载。
Switchcabinet is a kind of electrical equipment. The outer line of the switch cabinet enters the main control switch in the cabinet first, and then enters the sub-control switch. Each branch circuit is set according to its needs. For example, instruments, automatic control, motor magnetic switches, various AC contactors, some also have high-voltage chamber and low-voltage chamber switchgear, high-voltage buses, such as power plants, and some also have low-cycle load shedding to protect the main equipment.
开关柜（switchgear）的主要作用是在电力系统进行发电、输电、配电和电能转换的过程中，进行开合、控制和保护用电设备。开关柜内的部件主要有断路器、隔离开关、负荷开关、操作机构、互感器以及各种保护装置等组成。开关柜的分类方法很多，如通过断路器安装方式可以分为移开式开关柜和固定式开关柜；或按照柜体结构的不同，可分为敞开式开关柜、金属封闭开关柜、和金属封闭铠装式开关柜；根据电压等级不同又可分为高压开关柜，中压开关柜和低压开关柜等。主要适用于发电厂、变电站、石油化工、冶金轧钢、轻工纺织、厂矿企业和住宅小区、高层建筑等各种不同场合。
The main function of switchgear is to open, control and protect electrical equipment in the process of power generation, transmission, distribution and power conversion. The components in the switch cabinet mainly consist of circuit breaker, disconnector, load switch, operation mechanism, transformer and various protective devices. There are many classifications of switchgear, such as movable switchgear and fixed switchgear through the installation of circuit breakers; or according to the structure of the cabinet, it can be divided into open switchgear, metal closed switchgear, and metal closed armoured switchgear; according to the voltage level, it can also be divided into high voltage switchgear, in which the switchgear can be used. Pressure switch cabinet and low voltage switch cabinet, etc. Mainly applicable to power plants, substations, petrochemical industry, metallurgical steel rolling, light industry textile, factories and mining enterprises, residential areas, high-rise buildings and other different occasions.