This Acti9 Isobar B product is a distribution extension box for an Acti9 Isobar B distribution board. It only comes with a plain front cover. The total dimensions are (W) 470mm x (H) 270mm x (D) 124mm. Thanks to protection ratings and high quality ble (from 65 x 65 mm up to 361 x 254 mm) plus 3 different cover hei xes are available. Distribution box for surface mounting, for the current sub-distribution in interior and protected exterior areas, in accordance with IEC 439-3. With pre-mounted 35 mm hat profile rail. Transparent cover to screw on, with cut-out. Actual units use PNP status indicator, NPN status indicator, or neither. Wiring diagram shows PNP wiring. Simply insert your PVC pipe and push it through the flexible, polyethylene Tuf-Tite seal. Providing a simple, reliable, and permanent means for. This guide covers standard box sizes across every major industry, explains the difference between internal and external dimensions, breaks down carrier-specific size requirements for USPS, UPS, and FedEx, and gives you practical tips to find the right fit for any product. Size charts are provided. Q: What is the primary function of CHINT's Final Distribution Boxes? The primary function of CHINT's Final Distribution Board is to safely distribute electrical power to various circuits within a building or facility while providing essential protection and control.