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by Cisco
Product Line: Cisco Power Supply Units
Product Type: Power Supply
Original price $0.00 - Original price $300.00
Original price
$0.00 - $300.00
Current price $300.00
Title: Used

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Product Description

The PWR-C2-640WAC Cisco power supply delivers a maximum output power of 640W, with an input voltage range of 100 to 240 VAC (autoranging) and a frequency of 50 to 60 Hz. It supports an input current of 8–4 A and output ratings of +12 V @ 20.83 A and –54 V @ 7.36 A. Designed for efficiency, it has a total input BTU of 2371 BTUs per hour and an output BTU of 2183 BTUs per hour, with dimensions of 1.58 in. (H) x 3.75 in. (W) x 11.75 in. (D) and a net weight of 3.1 lb (1.41 kg).

Key Feature for the PWRC2640WAC

  • What is the maximum output power of the power supply unit?
    The maximum output power is 640 W.
  • Can you detail the input voltage range and frequency for part number 640 W?
    The input voltage range is 100 to 240 VAC (autoranging), with a frequency of 50 to 60 Hz.
  • What is the input current specification?
    The input current ranges from 8 to 4 A.
  • What are the output ratings for the 640 W model?
    The output ratings are +12 V @ 20.83 A and –54 V @ 7.36 A.
  • How many BTUs per hour does the unit input and output?
    The total input is 2371 BTUs per hour, and the total output is 2183 BTUs per hour.
  • What are the storage temperature limits for the power supply?
    The minimum storage temperature is –40 °F (–40° C), and the maximum is 158° F (70° C).
  • What is the relative humidity range for safe operation?
    The relative humidity range for operation is 5% to 96% (noncondensing).
  • Up to what altitude is the AC power supply designed to operate?
    The AC power supply can operate up to an altitude of 16,400 feet (5,000 m).
  • What is the net weight of the power supply unit?
    The net weight is 3.1 lb (1.41 kg).
  • Can you provide the dimensions of the power supply?
    The dimensions are 1.58 in. (H) x 3.75 in. (W) x 11.75 in. (D).

Product Review

The Cisco PWR-C2-640WAC power supply offers a maximum output of 640W, suitable for demanding network environments, with a wide input voltage range of 100 to 240 VAC, supporting global use. However, the power efficiency could be a concern as the total input BTU is 2371 per hour, indicating potential for improvement in energy consumption. Its compact dimensions and light weight make it easy to integrate into networking setups, but its operational temperature and humidity ranges require attention in extreme conditions.


The Cisco PWR-C2-640WAC is a power supply unit designed to deliver consistent and efficient power to networking hardware. It is engineered to support a maximum output power of 640 W, ensuring that connected devices receive sufficient power for optimal performance. This power supply is compatible with a wide input voltage range from 100 to 240 VAC, automatically adjusting to the input voltage to provide stable performance across different power sources and regions. With a frequency range of 50 to 60 Hz, it accommodates the standard power supply specifications globally. The unit is designed for efficiency, with input current specifications set between 8 to 4 A, depending on the input voltage. The output ratings are detailed as +12 V at 20.83 A and -54 V at 7.36 A, demonstrating its capability to support devices requiring stable 12 V or -54 V power. The device's performance is further highlighted by its BTU (British Thermal Unit) ratings, with a total input BTU of 2371 BTUs per hour and a total output BTU of 2183 BTUs per hour. This difference illustrates the power efficiency, with 640 W of effective power output and 695 W of power consumption. Regarding environmental tolerance, the PWR-C2-640WAC is built to withstand a broad range of storage temperatures, from as low as -40 °F (-40 °C) to as high as 158 °F (70 °C). This wide range ensures the power supply's durability and reliability in various storage conditions. It also operates effectively within a relative humidity range of 5% to 96% (noncondensing), allowing it to function in diverse environmental settings. Additionally, it can operate at altitudes up to 16,400 feet (5,000 m) when powered by AC, accommodating installations in high-altitude locations. The unit's physical specifications reveal a compact and efficient design. It weighs 3.1 lb (1.41 kg), making it lightweight and easy to install. The dimensions are equally compact, with a height of 1.58 inches (4.0 cm), a width of 3.75 inches (9.5 cm), and a depth of 11.75 inches (29.8 cm), ensuring it occupies minimal space within the hardware setup.
  • Maximum Output Power: 640 W, catering to high-performance networking equipment.
  • Auto-ranging Input Voltage: 100 to 240 VAC, facilitating global usage without the need for manual switching.
  • Efficiency and Reliability: Designed for optimal performance with low BTU output and wide environmental tolerance.
In summary, the Cisco PWR-C2-640WAC power supply unit is designed for networking environments requiring a high degree of reliability and efficiency. Its specifications cater to a broad spectrum of power needs while ensuring durability across various operating conditions.


Part NumberCisco PWR-C2-640WAC
Maximum Power Output640 Watts
Voltage and Frequency Range100-240 VAC (self-adjusting), 50-60 Hz
Current Input8 A to 4 A
Power Output Specifications+12 V @ 20.83 A, -54 V @ 7.36 A
Input BTU Rating2371 BTU/hr, 695 Watts
Output BTU Rating2183 BTU/hr, 640 Watts
Lowest Storage Temperature-40° F (-40° C)
Highest Storage Temperature158° F (70° C)
Minimum Humidity Level5% (non-condensing)
Maximum Humidity Level96% (non-condensing)
Operational Altitude LimitUp to 16,400 ft (5,000 m) for AC power supply
Weight3.1 lbs (1.41 kg)
Height1.58 in. (4.0 cm)
Width3.75 in. (9.5 cm)
Depth11.75 in. (29.8 cm)

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