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Limiting fuse / Class RK1 - CLS series
Component manufacturers are quite common but not if they are well known for their reliability. The EATON CLS current limiting backup fuses is a top of the line component. It is mostly used in conjunction with high voltage motor starters to provide short circuit protection for individual motors. The R-rated fuses are designed to withstand frequent severe heating and cooling cycles associated with motor starting duties without fatigue failures and are always used in a series with another interrupting device capable of interrupting currents below the fuses minimum interrupting current . Truly a wonder of modern technology and sheer ingenuity.