When using mesh, closed circuit voltage equation groups will be more exquisite, direct complex circuit is the special case of alternating complex circuit.
通过交、直流电路在使用基尔霍夫方程组解题的分析讨论，可知回路电压方程采用网孔法比较准确，不易出错。
The circuit has the function of thermal shutdown, current limiting and closed control loop of current and voltage.
该电路具有过热保护、短路保护功能和电流、电压闭环控制回路功能。
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！
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