Preventive Maintenance Kit for RADSS*110VDC Bus Interconnection Includes 2 pcs RXMVB 4 RK251403-AN Throw-over relay 1 pc RXSF 1 RK271128-AN Signal relay Note! Delayed alarm relay RXKL 1 1MRK000066-AB is not included in the kit Note! Installation of the RADSS Kit can only be performed by ABB Substation Sweden appointed personnel.