Bussmann BP/FRN-R-100 100 Amp Fusetron Dual Element Time-Delay Current Limiting Class RK5 Fuse, 250V Carded UL Listed 100A, Type FRN-R Cartridge Fuse Fusetron Time Delay Provides motor overload, ground fault and short-circuit protection Helps protect motors against burnout from overloads and single-phasing when sized properly Simplifies and improves blackout prevention (selective coordination) Can be applied in circuits subject to temporary motor overloads and surge currents to provide high performance short-circuit and overload protection Protects against low level overcurrent of overloads and will hold on inrush current 5 times greater than the amp rating of fuse for a min of 10 sec