Use relays, contactor, button, air switch and travel switch etc low-voltage constitute control circuit called relay contact control circuit.

使用继电器、接触器、按钮、空气开关、行程开关等低压电器构成的控制电路称为继电接触控制电路。

youdao

The paper introduces how to design the PLC non - contact control system in rebuilding electrical system of crane, on the basis of a practical example.

结合实际情况对以PLC为内核的全数字直流调速器电能驱动，进行了起重机的工作机构和电器系统改造实现电器系统无触点控制。

youdao

Control measures are underway including contact tracing, chemoprophylaxis of household contacts, and immunization of high risk groups.

正在采取控制措施，包括接触者追踪、家庭接触者化学预防和高危群体免疫接种。

youdao

If staff find themselves too fatigued to continue providing cover on standby, they should contact ambulance control and ask to be stood down.

BBC: NEWS | UK | Wales | Strike threat on ambulance cover

It was a tricky maneuver, and it didn't help that during its approach Messenger had to lose radio contact with mission control while it flew behind the planet.

NPR: NASA Probe Glimpses Unseen Side of Mercury

Businesses have been advised to contact private pest control companies.

BBC: Carlisle traders seek seagull problem solution