Preventive Maintenance Kit for RADSS*48VDC Bus Coupler CT Disconnector. Includes 1 pc RXMVB 4 RK251401-AH Throw-over relay 1 pc RXMVB 4 RK251403-AH Throw-over relay 1 pc RXMM 1 RK214002-AH Auxiliary relay 1 pc RXKL 1 1MRK000066-AB Time relay Note! Installation of the RADSS Kit can only be performed by ABB Substation Sweden appointed personnel.