断路器脱扣断电而使装置停止运行的电压门槛值。
欠电压脱扣器 Under-voltage release ; UVR ; undervoltage tripper ; YU
零电压脱扣 zero voltage trip
电压脱扣 voltage trip
低电压脱扣继电器 under voltage tripping relay
欠电压脱扣装置 uvt
侧面安装欠电压脱扣器 RU
带辅助的欠电压脱扣器 RUX
在额定控制电源电压低于35%时，欠电压脱扣器应防止断路器合闸。
At rated control supply voltage less than 35% under-voltage should prevent breaker from closing.
敬告：欠电压脱扣器必须先通电，断路器才能再扣及合闸。否则将损坏断路器！
Caution: under-voltage release must be electricity, circuit breaker can be closed, otherwise will damage circuit breaker!
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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