It carries a 63 A thermal current rating and 500 V AC rated voltage, so it handles the power feed for up to three downstream circuit breakers without needing individual wiring per phase.
This busbar is sized for three Siemens 3RV2 circuit breakers in frame sizes S00 and S0 — the two most common sizes for motor protection up to about 28 A (S0) and smaller loads (S00). The plug-in connection means you push the breaker onto the busbar fingers; no terminal screws or ring lugs to torque. The extension connector (included per the description) lets you daisy-chain additional busbar sections if the panel has more than three breakers in a row. Clearance requirements are tight: zero mm needed at the sides, zero mm backward, and only 10 mm upward — so you can pack breakers side-by-side without derating for spacing.
Physical dimensions: 136.4 mm wide, 129 mm tall, 58.5 mm deep. The width is the critical fit dimension because it spans three breaker mounting slots; the depth is shallow enough that it doesn't project past the breaker bodies. The busbar has three poles (, L2, L3) and no neutral, consistent with a three-phase motor branch feed.