该继电器的设计思想是将过压继电器和欠压继电器集成到一起，并且实时显示所测电压值，能修改电压的上、下限。

The low-voltage relay and the excess voltage relay are integrated into one relay, which can display the real time of the voltage of the circuit and the limit of voltage can be modified.

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在额定控制电源电压的35%～70%时，欠电压脱扣器应可靠使断路器脱扣；

Under the voltage of 35% ~ 70% of the rated voltage, the under-voltage release should make the breaker trip correctly.

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提出了一种能够自产生基准电压和偏置电流，并且锁定阈值电压和迟滞量稳定的新型欠压锁定电路。

A novel under-voltage lockout circuit is proposed which could generate reference voltage and bias current itself, and could stabilize lockout threshold voltage and hysteresis quality.

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