The Allen-Bradley / Rockwell Automation 1771-PSC Power Supply Chassis is for connecting power directly or through a cable to an I/O chassis. Slots for installation of power supplies and modules requiring only power from the backplane. 1771PSC houses 4 slots. Approximate dimensions are 311 x 203 x 180mm (12.23 x 8.0 x 7.1in.). Approximate weight is 1.9 kg (4.1lbs). The I/O Chassis mounting type is a back-panel mount.