What components are there in the distribution cabinet?

The common components in the distribution cabinet are as follows:

1. **Switching Electrical Appliances**

    - **Circuit Breaker**: It can connect and disconnect the circuit under normal and faulty conditions, 

and has the functions of overload, short-circuit, and undervoltage protection, such as universal circuit

 breakers, molded case circuit breakers, etc.

    - **Isolating Switch**: It is mainly used to isolate the power supply to ensure the safety of maintenance.

 There is a distinct open point in the open circuit state.

    - **Load Switch**: It can connect and disconnect the load current under normal conditions, but cannot 

cut off the short-circuit current. It is often used in combination with fuses.

    - **Fuse**: When the circuit has an overload or short-circuit, the fuse element of the fuse melts and cuts 

off the circuit, playing a protective role. There are high-voltage fuses and low-voltage fuses.

2. **Control Electrical Appliances**

    - **Contactor**: It is used to frequently connect and disconnect the AC and DC main circuits and large-capacity

 control circuits from a distance. It is mainly composed of an electromagnetic mechanism, a contact system, 

an arc extinguishing device, etc.

    - **Relay**: It controls the on-off of the circuit according to the changes of input signals (such as voltage, 

current, time, temperature, etc.). It can be divided into voltage relays, current relays, time relays, thermal relays, 

etc. Among them, thermal relays are often used for the overload protection of motors.

    - **Button**: It is a manually operated master control electrical appliance, used to send control signals to

 connect or disconnect the control circuit.

    - **Transfer Switch**: It is used to switch the working state of the circuit, such as power supply switching, 

forward and reverse control of the motor, etc.

3. **Measuring Electrical Appliances**

    - **Ammeter**: It is used to measure the current in the circuit and is usually used in combination with a 

current transformer to expand the measurement range.

    - **Voltmeter**: It is used to measure the voltage in the circuit and can measure high voltage through a 

voltage transformer.

    - **Power Meter**: It is used to measure the active power, reactive power, and apparent power of the circuit.

    - **Electric Energy Meter**: It is used to measure the electric energy consumed by the circuit. There are 

single-phase electric energy meters and three-phase electric energy meters.

4. **Protective Electrical Appliances**

    - **Lightning Arrester**: It is used to protect electrical equipment from the damage of lightning overvoltage 

and switching overvoltage and is usually installed at the incoming end of the distribution cabinet.

    - **Surge Protector**: It is mainly used to limit the surge voltage in the power supply system and protect

 electrical equipment from the impact of transient overvoltage.

    - **Grounding Switch**: It is used to ground the circuit to ensure the safety of maintenance personnel and

 is usually used in combination with an isolating switch.

5. **Other Electrical Appliances**

    - **Busbar**: It is used to collect and distribute electric energy and is usually a rectangular or circular

 conductor made of copper or aluminum.

    - **Cable**: It is used to transmit electric energy and connect the distribution cabinet with other electrical

 equipment.

    - **Insulator**: It is used to support and fix the busbar and other live conductors, insulate them from the

 ground, and ensure the insulation between the conductors at the same time.

    - **Indicator Light**: It is used to indicate the working state of the circuit, such as power indication, operation

 indication, fault indication, etc.

    - **Electricity Meter**: It is used to measure the consumption of electric energy for the accounting of 

electricity bills.

    The configuration of internal components varies for distribution cabinets of different types and uses. For 

example, the components of high-voltage distribution cabinets and low-voltage distribution cabinets differ 

in voltage levels, performance parameters, etc.; the main components of power distribution cabinets and

 lighting distribution cabinets also vary due to the different nature of the loads.