The product range is concentrated on two basic discs: the Metrosil Resistor Module. M&I Materials Limited supply a wide variety of Metrosils designed for the protection of high impedance relays. This must be greater than the maximum voltage that appears across the relay circuit under a given through fault condition Find out more about Metrosil silicon carbide varistors with our non-linear resistor data sheets, product brochures, care guide and application sheets The exact Metrosil rating will de