This cord satisfies the latest UL 943 self-test requirement and will improve safety, protect critical personnel from electrical shocks. It also can withstand outdoor conditions, is rainproof and the outdoor rated devices are OSHA compliant and feature weather-resistant SJTW cables. Ideal for vending machines, construction sites, RV parks, marinas, and spas/hot tubs. Automatic reset automatically restores power to connected equipment when plugged in or after power interruption.