The Siemens 3VU9135-1AB02-0RE0 is a busbar accessory designed for the 3VU13 switch range. It provides a 3-phase busbar connection for two 3VU13 switches, with a modular spacing of 3MW. This is the piece that ties multiple motor-protective switches together on a common power feed in a panel, saving the wiring runs you'd otherwise need per device.
Panel integration
The 3VU9135-1AB02-0RE0 mounts onto the 3VU13 switch's busbar system. Modular spacing of 3MW means it occupies three modular-width units on a DIN rail — plan your enclosure layout accordingly. The 3-phase busbar bridges two adjacent 3VU13 switches, so you feed one incoming supply and both switches share it. No extra wiring between switches.