RC5-2/440 is an RC surge protector designed to reduce the maximum surge peak value and to limit or even completely eliminate the high bias frequencies when used with an AC-operated conventional contactor for a control circuit rated voltage between 250 ... 440 V AC 50/60Hz. , Advantages:, - The surge protector is snapped onto the top or side of the contactor or auxiliary contactor without changing the dimensions of the device., - very fast clipping: attenuation of steep fronts and therefore of high frequencies. No operating delays.