The Siemens 3RV1915-1CB00-0FJ0 is a 3-phase busbar with a 45 mm scale division, designed to feed four SIRIUS 3RV motor starter protectors or 3RT contactors in a row. The fork-form connections (Fa. Benedikt & Jaeger style) mate directly to the switch terminals — no separate jumper blocks needed. This is the busbar that ties the line-side power across a group of motor starters in a panel, keeping the wiring clean and the voltage drop consistent zone to zone.
The 45 mm pitch matches the standard SIRIUS 3RV/3RT device footprint on DIN rail. When you snap four protectors side by side, this busbar bridges the L1-L2-L3 terminals across all four positions in one piece. The fork-form ends push onto the screw terminals; no wire lugs or ring terminals at each device. Keep the busbar seated fully before torquing the terminal screws — partial engagement leaves a high-resistance joint that heats under load.