Overload relay nameplate
IEC 292-1 is the name of a specification it was designed to follow.  A Google search for IEC 292-1 finds several parts you could look at to see if any of them are suitable replacements.

660V means that the maximum peak voltage it was designed for is 660 volts.

3 PH means that it is for a 3 phase motor.  Suitable power for such motors is often found in factories and in large stores, but rarely in homes.

AUX is probably an abbreviation for auxiliary.

Ith does not have an obvious meaning.

10A means that the allowed current is 10 amperes.

500V ~ max probably means that the maximum nominal input voltage is 500 volts AC.

600V a.c. max means that an input voltage of 600 volts AC is allowed, even if higher than recommended.

Aux. is probably an abbreviation for auxiliary.

H.D. does not have an obvious meaning.