The EZB400W12: The 400 A rated current sets the continuous current-carrying capacity of this busbar — it's sized for a main feeder or large sub-distribution board where the sum of downstream loads stays under that figure.
Panel Integration and Capacity
The busbar is 416 mm wide, 590 mm tall, and 107 mm deep — a substantial footprint that needs to be accounted for in enclosure layout, especially depth clearance. It's a 12-way bar with an optional 2- or 4-way busbar extension, giving flexibility to expand the distribution block. Device capacity is 12 three-pole devices, 18 two-pole, or 36 single-pole, which maps to how many branch circuits you can tap off it. Designed to IEC 60439, the standard for low-voltage switchgear and controlgear assemblies, so it's built for panel integration in a certified assembly.