The Siemens 3VU2915-0F is a vertical terminal cover designed for the 3VU2.1, 3VU2.2, and 3VU2.3 frame sizes of the 3VU2 motor-protective circuit breaker family. It shields the line and load terminals after wiring, keeping accidental contact out of the panel.
This cover snaps onto the breaker body after the panel builder has landed the power and load wires. It does not change the breaker's electrical ratings — it is strictly a finger-safe touch guard for the terminal zone. Vertical orientation means the cover runs parallel to the DIN rail, matching the breaker's long axis.