The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
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Operating temperature |
23 to 113°F (-5 to 45°C) |
Storage temperature |
-40 to 158°F (-40 to 70°C) |
Relative humidity |
Operating and nonoperating: 10 to 95% (noncondensing) |
Operating altitude |
Up to 10,000 ft (3000 m) |
Storage altitude |
Up to 15,000 ft (4570 m) |
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Dimensions (H x W x D) |
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Without power supply modules |
1.75 x 17.5 x 18 in. |
With one C3K-PWR-1100W AC power supply module1 |
1.75 x 17.5 x 19.5 in. |
With two C3K-PWR-1100W AC power supply modules |
1.75 x 17.5 x 19.5 in. |
With one C3K-PWR-715W AC power supply module |
1.75 x 1.75 x 18 in. |
With two C3K-PWR-715W AC power supply modules |
1.75 x 1.75 x 18 in. |
With one C3K-PWR-350W AC power supply module |
1.75 x 1.75 x 18 in. |
With two C3K-PWR-350W AC power supply modules |
1.75 x 1.75 x 18 in. |
1 The C3KX-PWR-1100 W AC power supply extends 1.5 in. (3.8 cm) beyond the switch chassis |
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Maximum output power |
1100 W |
715 W |
350 W |
Input voltage range and frequency |
115-240 VAC (autoranging) |
100-240 VAC |
100-240 VAC |
Input current |
12-6 A |
10-5 A |
4-2 A |
Output ratings |
-56 V @19.64 A |
-56 V @ 12.8 A |
-56 V @ 6.25 A |
Total input BTU1 |
4263 Btus per hour, 1250 W |
2742 Btus per hour, 804 W |
1357 Btus per hour, 398 W |
1 The total input BTU ratings refer to power from the power source to the power supply. Total output BTU ratings refer to power output from the power supply to the switch. The BTU ratings are based on 100 VAC for the 350-W and 715-W power supplies and 115 VAC for the 1100-W power supply. |
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Maximum output power |
440 W |
Input current |
16-8 A |
DC input voltage |
-36 to -72 VDC |
Output ratings |
-56 V@ 7.86 A |
Voltage range |
-36 VDC (minimum), -48 VDC (nominal), -72 VDC (maximum) |
Total input BTU1 |
1841 Btus per hour, 540 W |
Total output BTU1 |
1502 Btus per hour, 440 W |
Wire gauge for ground connection |
12 AWG or 8 AWG |
Branch circuit protection |
20 A |
1 The total input BTU ratings refer to power from the power source to the power supply. Total output BTU ratings refer to power output from the power supply to the switch. The BTU ratings are based on -36 VDC. |