Rockwell Automation Publication 2100-IN012G-EN-P - August 2016 11
Chapter 1
General Information
Allen-Bradley® CENTERLINE® Motor Control Centers (MCCs) consist of
one or more vertical sections containing electromagnetic or solid state control
devices that are prewired and tested within modular (plug-in) or frame
mounted (hard-wired) units.
These are the standard dimensions for CENTERLINE MCCs:
•Standard widths
– 20 in. (508 mm)
– 25 in. (635 mm)
– 30 in. (762 mm)
– 35 in. (789 mm)
– and 40 in. (1016 mm)
• Standard front-mounted depths
– 15 in. (381 mm)
– 20 in. (508 mm)
• Standard back-to-back mounted depths
– 30 in. (762 mm)
– 40 in. (1016 mm)
•Standard height
– 90 in. (2286 mm)
– 70.5 in. (1791 mm)
All MCC sections are supplied with top and bottom horizontal wireways.
Sections that are designed to accommodate plug-in units include a vertical
wireway. Each 90 in. (2286 mm) vertical section can accommodate up to 6.0
space factors or 78 in. (1981 mm) for units.
Units (buckets) are designed in increments of 0.5 space factors. Each 0.5 space
factor is approximately 6.5 in. (165.1 mm) high. Units are designed as either
removable (plug-in) or frame-mounted (non-plug-in).
Individual units house a wide variety of power and logic devices. Plug-in units
are mounted on unit support pans within the section. Stab assemblies on the
back of the unit plug onto the vertical bus. A mechanical interlock prevents the
unit door from being opened when the disconnect is not in the OFF position.
An additional mechanical interlock prevents the unit from being plugged-in or
unplugged when the disconnect is not in the OFF position.
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