What the different values written on Relay mean?
There are Agency Approval Symbols on the left and right side, above the values.

These symbols represent the approvals for those standards.

Some countries like US, Canada use Mains electricity around 110 volts. The "C" and the "US" markings (on the right) signify that the component is UL recognized in both Canada and the United States.

Thus, values below that symbol are the values for the US and Canada market/use.


10A 125VAC
10A 28VDC


The values on the right side are for use in countries that use Mains around 220 volts:


10A 250VAC
10A 30VDC


Different Agency Aproval Symbols can be found here:
http://www.jameco.com/Jameco/marketing/agency-symbols.html