What Are The Commonly Used Electrical Components In The Power Distribution Cabinet? Understand It Easily In 3 Minutes
May 29, 2025
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What are the commonly used electrical components in the power distribution cabinet? Understand it easily in 3 minutes
1. Circuit breaker
The function is to cut off and connect the load circuit, as well as cut off the fault circuit to prevent the accident from expanding and ensure safe operation.
2. Isolating switch
The function is to disconnect the circuit without load current, so that the equipment under maintenance has a clear disconnection point with the power supply to ensure the safety of the maintenance personnel.
3. Fuse
The function is to melt the fuse with the heat generated by itself when the current exceeds the specified value, so as to disconnect the circuit.
4. Voltmeter
It is an instrument for measuring voltage. It is a relatively large resistor, which is ideally considered to be a circuit breaker. When using it, the voltmeter must be connected in parallel to both ends of the circuit to be measured; In addition, the range should be selected correctly, and the measured voltage should not exceed the range of the voltmeter.
5. Ammeter
The instrument used to measure electrical energy, commonly known as "electricity meter". When in use, the ammeter should be connected in series in the circuit to avoid short circuit. Not only should the measured current not exceed the range of the ammeter, but it is also absolutely not allowed to connect the ammeter to the two poles of the power supply without passing through the electrical appliance, otherwise it is likely to cause electrical accidents.
6. Relay
It is an electronic control device, usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current.
7. Leakage protector
It is mainly used to protect against leakage faults in equipment and personal electric shock with fatal dangers. It has overload and short circuit protection functions.
8. Current transformer
It is used to convert a larger primary current into a smaller secondary current through a certain change, which is used for protection, measurement and other purposes.
9. Transformer
It is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil and the iron core (magnetic core).
The above are some basic components in the distribution box. In actual use, people will add other components according to the different uses of the distribution box and the requirements for the use of the distribution box, such as: AC contactor, signal indicator light, intelligent fire evacuation lighting, background monitoring system, EPS power battery, etc.
