Cisco C9550 Series Smart Switches Hardware Installation Guide

AC-input power supply specifications

Updated: July 17, 2026

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Power input specifications for the 750W and 1100W AC power supply modules.

Provides the AC input power supply specifications.

Table 1. 750W AC-input power supply specifications
Specification	Description
AC-input type	Wide-ranging input with power factor correction. Note Power factor correction is a standard feature on AC-input power supplies. Power factor correction reduces the reactive component in the source AC current, allowing higher power factors and lower harmonic current components.
AC-input voltage	90 VAC (min) to 264 VAC (max)
AC-input current	9A at 100VAC 3.8A at 240VAC
AC-input frequency	47 to 63 Hz nominal
Branch circuit requirement	Each chassis power supply should have its own dedicated, fused-branch circuit: North America—20 A. International—Circuits sized to local and national codes. All AC power supply inputs are fully isolated. Source AC can be out of phase between multiple power supplies in the same chassis, which means that PS1 can be operating from phase A and PS2 can be operating from phase B. For high-line operation, the power supply operates with the line conductor wired to a source AC phase, and the neutral conductor wired either to a neutral, single-phase power system, or to another source AC phase as long as the net input voltage is in the range of 180 to 264 VAC.
Power supply output	Main output: 12V at 62.5A Standby output: 3.3V at 5A
Output holdup time	20 ms minimum with full input range
kVA rating (kilovolt-amperes is the measure of apparent power in electrical systems, indicating the total power output.) ¹	0.75 kVA maximum (total output power)
MTBF	7,937,420 hours

Table 2. 1100W AC-input power supply specifications
Specification	Description
AC-input type	Wide-ranging input with power factor correction. Note Power factor correction is a standard feature on AC-input power supplies. Power factor correction reduces the reactive component in the source AC current, allowing higher power factors and lower harmonic current components.
AC-input voltage	90VAC to 264VAC
AC-input current	12.8A at 100VAC 5.2A at 240VAC
AC-input frequency	47 to 63 Hz nominal
Branch circuit requirement	Each chassis power supply should have its own dedicated, fused-branch circuit: North America—20 A. International—Circuits sized to local and national codes. All AC power supply inputs are fully isolated. Source AC can be out of phase between multiple power supplies in the same chassis, which means that PS1 can be operating from phase A and PS2 can be operating from phase B. For high-line operation, the power supply operates with the line conductor wired to a source AC phase, and the neutral conductor wired either to a neutral, single-phase power system, or to another source AC phase as long as the net input voltage is in the range of 180 to 264 VAC.
Power supply output	Main output: 12V at 92A Standby output: 3.3V at 5A
Output holdup time	20 ms minimum with full input range
kVA rating (kilovolt-amperes is the measure of apparent power in electrical systems, indicating the total power output.) ¹	1.1 kVA maximum (total output power)
MTBF	7,937,420 hours

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