What the 1600 A rating means for your switchboard
Four poles cover three-phase plus neutral, common for main incomers or bus-tie applications in 400 VAC systems.
Drawout mounting and panel fit
Drawout mounting means the chassis slides into a fixed cradle — you rack the breaker in for service, rack it out for isolation without unbolting power cables. The footprint is 560 mm deep, 400 mm wide, 440 mm tall. That depth is the dimension you need to clear inside the enclosure when the breaker is fully racked in; the cradle adds its own depth behind the door. Verify the switchgear cubicle depth against 560 mm plus the required rear clearance for arc containment and cable bending radius.