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how to control mains supply using relays

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raghun

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hi,
i am designing water level indicator for over head tanks .
problem is ,when the tank is full ,i want to switch off the main supply(230v ac,50hz) of motor using relays.
can any one give suggestions.
thank u
raghu.
 

Do you use a µC to control your water level indicator?

What is the signal from the indicator?

Do you amplify it?

What is the voltage of the motor? Is it a multiturn or a single phase?

Can you provide some more info on this?

D.
 

raghun said:
hi,
i am designing water level indicator for over head tanks .
problem is ,when the tank is full ,i want to switch off the main supply(230v ac,50hz) of motor using relays.
can any one give suggestions.
thank u
raghu.
Click to expand...

Hello,

I think you must fire a relay trough a transistor with the uC, and this relay might have to fire a contactor.

One of the diferences between a relay and a contactor is the voltage of the fire coil. You could fire a relay normally with 12v CC. For fire a contactor you must used 110 VAC, 220VAC or 380VAC.

You must used a contactor and not a relay to turn on or off motor is the consumption, a relay is not design for switching high currents. A contactor normally have a power range from 3~250 KW/400V for AC as well as DC operation.

By,

GuillerMo (AR)
 

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