Intermediate relay is a type of control undervoltage relay which is used to add the amount of control signal or amplify the signal.

在自动化控制系统中采用大量的中间继电器，其工作的可靠性对控制系统工作的可靠性是至关重要的。

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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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The switchover is happening so that Freeview services can be extended to people who cannot currently get them, including those who receive their signal from a relay transmitter.

BBC: Northern Ireland digital switch catches some on hop

It was fifty years since the first live pictures from America were broadcast to Europe, via Telstar 1, the first communications satellite to relay a television signal.

FORBES: Telstar, the Fifty Year Old Hero of Communication

The dish would send the ISP's data up to one of the satellites (in low earth orbits to minimize signal delay), which would then relay the data back down to a backbone access point.

CNN: What will the Internet of the future be like?