The 63 A rated current means it handles the full incoming supply for a typical sub-main or large final circuit, not just a branch load.
Clip-on DIN rail mount, 72 mm wide — that's 8 modules of 9 mm pitch. Neutral on the left, 18 mm phase-to-phase terminal spacing. Tunnel terminals accept up to 35 mm² rigid or 25 mm² flexible; strip 14 mm and torque to 3.5 N.m. IP20 front, so it lives inside an enclosed panel, not on the wet side of the gland plate. The padlocking device and contact-position indicator make lockout/tagout straightforward for the field-service tech who has to swap it fast.
The Acti9 xID family is a standard line, so this order code is a straightforward BOM line item.