... sets of equipment for the front-end three-phase power distribution equipment. This series of products have the ... over-voltage and leakage, can be widely used in high-rise buildings, residential, railway stations, ports, airports, hospitals, theaters ... easier to maintain.Technical parameters:DK-220AC40Product NameDK-220AC40type power SPDProtection levelC classRated voltage Un(V)220VRated Load Current ...