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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Switch card specifications typically specify relay drive current rather than coil power.

开关卡的技术指标通常给出继电器的驱动电流值，而不是线圈功率。

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Since the relay was a subminiature type, the coil current was relatively high, requiring a driver.

由于继电器是一种微型的类型，线圈电流相对较高，需要一名司机。

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