AT&T 3B2/300 Technical Reference Manual page 235

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3B2/500 Computer Power Supply, ACS752A or CS752A
The 3B2/500 computer is equipped with either an ACS752A or a CS752A Power Supply Unit.
ACS752A and CS752A Equipment Characteristics
Electrical.
Voltage
Frequency
Power Consumption
100 to 120 V AC, 7 Amperes
200 to 240 V AC, 4 Amperes
50/60 Hz
680 watts (or less)
EQUIPMENT DESCRIPTION 2-211