The MA15D1SI is an AC and DC power Surge Protector that protects electronic equipment and computer networks against the effects of noise pollution induced in power supplies. This MA15 unit filters out and suppress the effects of industrial noise and surges caused by lightning, switching devices, thyristor controls, transmission system overloads and power-factor correction circuits. Although industrial computers and PLCs are designed to be rugged, the extra protection provided by the DIN-rail mounting MA15 units is critical. Ideally suited for protecting panel mounted equipment and typically used in the controls section of a motor control center (MCC), the MA15 range provides surge and RFI protected power.