The RK5 fuse provides motor overload, ground fault and short-circuit protection. Helps protect motors against burnout from single phasing on 3 Phase systems. Simplifies and improves blackout prevention (selective coordination). Dual-element fuses can be applied in circuits subject to temporary motor overloads and surge currents to provide both high performance short-circuit and overload protection. The overload element provides protection against low level overcurrent of overloads and will hold an overload which is 5-times greater than the ampere rating of the fuse for a minimum of 10-seconds.