Relay withstand

I have Relay whose Contact rating is 30VDC/4A as per the datasheet. My customer is provding contact voltage with the rating 110VDC/1A. Will my relay work/withstand?

Hi,

Obviously, it won't. The datasheet states the maximum allowable electrical characteristics that it can withstand and was made for.

Thanks Kevin.But my customer is thinking from Power point of view.
For ex. the data sheet ratings are 30VDC/4A current thants means power rating is 120 watt.My customer is providing 110VDC/1A that means power rating is 110 watt.so therotically he may be correct.What do you thinkk on this?

That maybe somewhat true and a good point in terms of relays. You can check this out: http://www.relaypros.com/choosing_proper_amperage.htm

There may be a safety issue, the voltage rating will be related to creepage and clearance, a 40V relay is operating at ELV, where safety requirements are not so stringent. At 110V there may be a possibility of voltage breakdown between the contacts and the coil, either at the relay base or internally, irrespective of what voltage is present on the coil. So check the data sheet for that aspect of the problem,
cheers,
richard

Gentlemen,

I think that using power calculations in this example is just plain wrong... Your contact is not dissipating 120 Watts. It has a rated resistance (we will neglect impedance and capacitance for sake of simplicity), and that means that the power "seen" by the contacts is just P = R * I^2 . In your case, the manufacturer has determined that if the current is greater than 4A, then the dissipated power becomes enough to start to heat up contacts and lead to eventual failure or loss of reliability. When you contact is closed, the relay doesn't "see" the applied voltage, only the difference across it's contacts!

In your case, that means that current-wise you would be fine, because you are below the rated 4A.

But Richard is right, the rated voltage is there to avoid your contacts from arching between themselves when they are open. I wouldn't go past the rated voltage of 30 VDC either.

Hope this helped!