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The function of overvoltage and undervoltage protection devices

Promulgator : TAIXIDate : 2018-08-24Views : 1840

The main function of the overvoltage and undervoltage protection devices is to break the short-circuit current. When the short-circuit fault occurs, the circuit breaker will trip the protection equipment. The function of under voltage protector is to trip when the system voltage is below the set value.

Overvoltage and undervoltage protection devices is designed with high-speed micro-power processor as the core of control circuit, magnetic retaining relay as the main circuit and analog-digital standard. When over-voltage and under-voltage occur in the power supply line, the protector can cut off the circuit quickly and safely under the continuous high-voltage impulse to avoid abnormal voltage feeding to the terminal. When the voltage returns to normal value, the protector will automatically switch on the circuit within the specified time to ensure that the terminal electrical equipment is running normally without anyone on duty.

Overvoltage and undervoltage protection devices
is suitable for single-phase AC voltage 220V, frequency 50Hz, rated operating current 60A and below the user or load. The protection of single-phase electrical equipment is caused by the overvoltage of single phase line caused by neutral fault. It is mainly used for the protection of distribution lines in residential residential boxes or the protection of single-phase electrical equipment.


1. Cut off the circuit when the single-phase line overvoltage occurs. The voltage of the single-phase line returns to normal. After delay, the line is automatically reset and connected without manual operation.
2, When transient or transient overvoltage occurs, the voltage protection devices does not cause any malfunction.
3. When the line voltage is unstable due to faults such as improper contacts, or suddenly power off and suddenly calls, the protector is not connected to the line.
4. When the line fault voltage is the highest, the voltage protection devices itself will not be damaged.

Matters needing attention

1. The current national technical standards for voltage protection devices are being drafted by the Bid Committee, and the start-up time after power-on is not strictly stipulated.
2. N line of voltage protection devices is zero line, L is the FireWire, and no error is allowed.
3. Before use, please tighten the screw thread to prevent the poor contact and damage the product.