Square D™ brand Surgelogic™ SDSA products are compact and affordable Surge Protective Devices (SPDs) available in numerous voltage configurations. These SPDs come in single phase and three phase design. SDSA SPDs offer a simple means to bring down initial surges to manageable levels and can offer additional value in a cascaded SPD system. Their compact design allows surge suppression to be installed adjacent to power panels or directly on sensitive equipment.