The Square D SDSA3650 is a three phase, Type 1 Surge Protective Device (SPD) that provides lightning and surge suppression. Designed for service entrance/branch panel protection, the SDSA3650 can be used in lightning and high-current areas such as antennas and parking-lot lighting. These devices may also be used as surge suppression for irrigation pumps, oil pumps and motors operating in three phase systems less than 600V. SDSA3650 SPDs are also ideal for OEM’s, residential retrofit, and multi-unit construction projects.