Thread: Let's talk about Relays

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Originally Posted by atichargr

I noticed that relays really started working off of the ground side when computers started running everything... I suppose it is the easiest way for the computer to control things.. doesn't have to supply power much safier to just supply the ground

Actually this was happening before computers but it was mostly in industrial appellations and is considered the best way to control devices that use higher amperage's because the device that is being controlled (load)drops the amperage(usually) across the device resulting in the relay handling a lower amperage than it would connected to the positive side. Thus resulting in relays operating cooler,contacts last longer and often times be made smaller especially in computer controlled applications . Most all of the power relays in the aircraft that i use to work on were wired this way.
Kenny