Alphacool ES 40mm PWM Fan, 40x40x28mm

The Alphacool ES fans were specially developed for use in servers and workstations and, unlike usual, do not offer a 2 or 3-pin DC power connection, but a 4-pin PWM control.

PWM control
Instead of using the usual 2 cables or the 3-pin connection, Alphacool now also uses a modern 4-pin PWM connection for its enterprise fans, which is supported by more and more server mainboards. The fan always receives full voltage via the 4-pin PWM connection and is controlled by pulse width modulation. This allows the fan to be controlled over a significantly larger speed range. By controlling the fans in server racks, a significant amount of energy can be saved. With 0% PWM control, the fans can even be stopped completely. The fan also offers a smooth start, which increases the life of the fan and reduces the risk of injury. At speeds of several thousand revolutions per minute, no body parts should get between the fan blades.

Double ball bearing
Unlike classic plain bearings, the Alphacool ES fans have a double ball bearing for an increased service life under full load. Double ball bearings are generally considered to be the highest quality bearings in terms of durability and quality. This also ensures smooth running with minimal vibrations.

Protective circuits
All Alphacool Enterprise fans have several protective circuits. If the fans are blocked, they automatically try to restart at reduced speed after a few seconds. Thanks to the gentle start, including the emergency start function, the fan can be blocked for up to 72 hours without suffering any damage. If the polarity is incorrect when connecting, the electronics will not burn out for at least 5 seconds. If the fan is connected incorrectly for a short time, that's not a problem.

The Alphacool ES fans for servers and workstations offer an extremely high air throughput and a very high static pressure. They are therefore ideal for operation on radiators or as particularly powerful case fans.

Technical data
L x W x H: 40 x 40 x 28 mm
Speed: 400 - 15,000rpm
Fan bearing: Double ball bearing
Connection: 4-pin PWM
Cable length: 30 cm
Operating voltage: 7 - 14V
Starting voltage: 7V
Current consumption: 0.33 - 0. 42A (3.96 - 5.04W)
Static pressure: 33.9 mm H2O
Air flow: 38.39 m³/h
Volume max: 49.2 dB(A)
MTBF: 70,000h