how to wire a relay switch
Remember that the. Using a BJT as a Switch.
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Tools and Supplies Needed.
. The second half of the relay is the switch that controls power to a particular accessory like a fuel pump or ignition system. A mercury relay mercury displacement relay mercury contactor is a relay that uses mercury as the switching element. Such a circuit would be extremely simple as in the figure below a.
Suppose we have a lamp that we want to turn on and off with a switch. In short when the primary side of the relay electromagnet is activated it closes the contacts switch to supply power to operate the accessory. Owing to environmental considerations about the toxicity of mercury mercury relays are mostly obsolete.
They are used as high-current switches or contactors where contact erosion from constant cycling would be a problem for conventional relay contacts. For the sake of illustration lets insert a transistor in place of the switch to show how it can control the flow of current through the lamp. The ST terminal only activates when the ignition switch is turned to the.
This wire energizes vehicle accessories such as the radio when the ignition switch is turned to the ACC position. Connect starter relay wire to the ST terminal of the ignition switch. Small piece of automotive wire.
Connect the accessory lead wire to the ACC terminal of the ignition switch using the appropriate wire terminal.
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