对于频繁通断的负载，应该选用晶闸管输出或晶体管输出，它们属于无触点元件。
For frequent load-off should be selected output or thyristor output transistors, which are non-contact component.
SCR为无触点、静止元件，可有效降低设备运转故障率；
The SCR is a static element switch without touch-point. It can efficaciously reduce to the failure rate of the device.
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