S.I.R. is an Italian manufacturer of power resistors. Founded in 1968 S.I.R. Resistor has been able to en- large its market, which can now sweep everywhere in the world, and its products variety, that, for standard products, currently ranges from 3 W till 64 kW, and up to IP 65. Besides that, S.I.R. is well estimated for its products quality, as well as for its flexibility and customization’s ability.