Safety Switch, 30 Amp Fusible 3 Wire 240 VAC NEMA 4 4X 5, Power Rating 7 HP Heavy-Duty Safety SwitchesDesigned to withstand short circuits up to 200kA rating when used with, or protected by, Class R fuses with Class R kits installed (this page). See Class RK5 fuses on page 259. Switches meet NEMA Standards KS1-1990, Enclosed Switches, and UL 98. UL Listed.