Calculation of current coil is discussed to middle relay and signal relay, lay stress on signal relay that contents condition and selects a type in different circumstances.
介绍中间继电器和信号继电器电流线圈的计算，着重分析信号继电器所需满足的条件和在不同情况下的选型。
Calculation of current coil is discussed to middle relay and signal relay, lay stress on signal relay that contents condition and selects a type in different circumstances.
介绍中间继电器和信号继电器电流线圈的计算，着重分析信号继电器所需满足的条件和在不同情况下的选型。
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