The diagnostic display kit for surge protection devices (SPDs) delivers real-time visual diagnostics. Enabling immediate insight into device status and performance to support proactive maintenance and system reliability. 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. Designed for 240VAC delta three phase systems. This product is UL and CSA certified.