The highest voltage a switch card can withstand reliably is the maximum voltage specification, which is determined primarily by the relay specification.
开关卡能够可靠承受的最高电压即为最大电压指标，它主要是由继电器的技术指标决定的。
2
For example, it may be necessary for a system to route high voltage signals at some times and high current signals at others.
例如，一个系统可能有时候需要路由高压信号，而其它时间则需要路由大电流信号。
3
This system cost lower, delay times shorter, switching speed faster, output volt-age accuracy higher.