Surgelogic™ Type EMA Series surge protective devices deliver specification grade performance for service entrance or critical branch panel applications. These multi-phase surge suppression systems provide transient suppression, noise filtration in a durable modular package. US and Canadian UL® Listed as Type 2 SPD to the UL 1449 standard. Complies with requirements of NEC® Article 285, CSA 233.1-87, and CSA C22.2 No. 8- M1986 as appropriate. Equipped with sine wave tracking module.