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I am using the TinkerKit Relay Module and recently they changed the relay mounted on the board from a white one with 10A250V~ to a black one with 10A125V~.

In my country the voltage is 220V~. Can I use the black relay in my application, safely? May be there problems that I have to be careful?

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    Definitely no!!!
    – Gerben
    Commented Mar 16, 2015 at 14:06
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    Though it will most likely work, safely is wrong. If it is rated at 125V, it will work safely up to 125V only :)
    – AllanNorgaard
    Commented Mar 16, 2015 at 14:29
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    In fact the answer is maybe. It all depends on the detailed relay specifications. Many relays have a current rating at one voltage, and a lower rating at a higher voltage. There is, of course, a maximum voltage, independent of current and vice versa.
    – Milliways
    Commented Mar 17, 2015 at 6:51
  • The link is not good. Are you using this T010010 model? uk.rs-online.com/web/p/…
    – user31481
    Commented Oct 28, 2017 at 10:44

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The part is obsolete now according to Mouser. The simple answer is no, you cannot use a 120 volt part at 220 volts. The higher voltage can breakdown the lower voltage rated parts. It really has nothing to do with the "power" rating as there will be very little power actually dissipated in the relay. The current handling of the contacts is one issue and that seemingly didn't change but the voltage rating change is basically saying that this part cannot work at 220volts.

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