... high-low-range switch 高低量程转换开关 high-low voltage relay 高低压继电器 high-low voltmeter [电源的]高低压警报电压表，高低压电压表 ...
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high-low voltage group reachges relay 高低压继电器
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Due to the specialty, REF relay is a current relay with very high sensitivity or a voltage relay with very low acting power.
由于零差保护的特殊性，零差继电器本身就是一只灵敏电流继电器或动作功率很小的电压继电器。
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