Surgelogic? Type IMA systems are internal surgical protection devices with a focus on service entrance and critical branch panel surge suppresion. With a surge current rating of 120,000 Amps and enhanced EMI/RFI filtering, this unit is retrofitted to be installed in a wide variety I-Line Branch units. Being modular in design, this unit is able to achieve superior surge suppression on the line side without an external overcurrent protective device. This unit uses the WYE system to allow two different voltages using three phase. This product is UL and CSA certified.