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Supply Voltage

what can happen if the supply voltage to a mechanical relay is above the relay's nominal coil voltage?

i have this double pole, double throw relay which which has a coil voltage of 9V dc and contacts that can handle up to 2A at 30V dc. What would happen if i supply this relay (for its activation) electricity above the 9V dc ? Say for example i supply it with 20V dc, would it blow the relay up?

The relay will eventually overheat and burn, if fed from a 20V. source for more than seconds.
The simplest solution is to place a resistor in series with the relay.
Measure or determine from its markings, the coil current at 9V. Let's say it is 20mA. (.020A)
You need to drop a voltage of (20 - 9) = 11 volts.
R = E/I, = 11/.020, = resistance of 550 ohms.
Then, check power dissipation.
W = (EI), = 11 x .020, = 0.22W.
In this case, a 1/2W. resistor can be used, 510 ohm is a standard value close enough.

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DC Output Voltage from Bridge Rectifier Circuit

Tags: diy, electronics, hardware, power, reference, supply voltage, supply voltage op amp, supply voltage rejection, supply voltage terminal 30, supply voltage variation

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