Reliable single pole and 2-pole high voltage relays developed for use for switching airport runway lighting with over 20 years of trouble-free use up to 2400V, 50/60Hz, up to 20 amp maximum interrupt, has been now upgraded to also handle up to 5000V 50/60Hz, 12 amps maximum interrupt. Unit is air insulated, does not require vacuum, oil or sulfurhexafluoride insulation or a leak tight container. Has 25 to 100 amp maximum continuous capability, a peak 1 minute test of 10 to 28kV RMS and operates with 115V or 230V 50/60Hz actuator.