Thank you for your interest in MVC products. MVC has been manufacturing surge suppression devices since 1988, with a line ranging from 12 VDC to 4160 VAC. We hold a United States and Canadian UL 1449 Second Edition Listing on the MV-Series SPD. The ICP Series holds UL Recognition in the United States and Canada. The WS-Series holds a United States patent. All of our units are designed with safety fusing to prevent against the risk of violent failure. A properly installed MVC suppressor has never ruptured its enclosure. All of our units are designed to be NON ground-dependent for greater reliability, as well as safety.