Zero-crossing relay picks-up when the output voltage is near to zero and always dropout at zero-current. It is suitable for commutation for resistive and capacitive loads. It is supported with anti parallel double SCR output is the most used solid-state relay in industrial applications. It can be used for resistive, inductive and capacity loads. It is energized when voltage meets the zero point and disenergized when current meets the zero point, depending on the signal control on the input circuit. It is designed to stand high-value transitory applications. When the relay has to stand high currents for a long period, it is necessary to grant a proper dissipation and an adequate electrical connection between relay terminals and the load.