Caution: under-voltage release must be electricity, circuit breaker can be closed, otherwise will damage circuit breaker!
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！
Although synthetic test method has been widely applied in breaking test of circuit-breaker, as synthetic making test under full voltage, it has been relatively less studied and applied.
合成试验方法在断路器开断能力考核中得到了广泛应用，但就额定电压下的合成关合来说其研究和应用相对较少。
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