Amp-Trap® 2000 SmartSpot® time delay A6D-R fuses provide IEC type-2 "no damage" protection to existing mains, feeders and branch circuits serving motor and non-motor loads. A6D-R fuses will open fast enough under extreme fault conditions for maximum short circuit protection to prevent damage to motor starters, switches and other circuit components, yet also provide the time delay needed for motor inrush currents. A6D-R fuses can be used to replace obsolete 600 VAC class H, K or RK5 fuses already installed in the field.