The Siemens 3RV1965-3AA0 is a SIRIUS rear-side connection block sized for three 3RV1.6 motor-protective circuit breakers. It routes the power wiring behind the devices, keeping the front panel clear for the rocker switch and auxiliary wiring — a clean layout for a multi-motor group in a single enclosure.
This block mounts on a 35 mm DIN rail per DIN EN 60715, the same rail the 3RV1.6 breakers snap onto. The rear-side connections accept 2x (0.5 … 1.5 mm²) solid or stranded and 2x (0.75 … 2.5 mm²) finely stranded with ferrule. Screw terminals torque to 0.8 … 1.2 N·m with a Pozidriv size 2 bit.