Switch card specifications typically specify relaydrive 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。
2
RelayDrive Current. The amount of current necessary to energize a relay. Usually specified per channel.
继电器驱动电流激励继电器所需的电流总量。通常以每通道给出。
3
This charge transfer is due to the mechanical release or closure of the contacts, the contact-to-coil capacitance, and the stray capacitance between signal and relaydrive lines.