The Alphacool ES fans have been 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. Via the 4-pin PWM connector, the fan always receives full voltage and is controlled by pulse width modulation. This allows the fan to be controlled over a much wider speed range. A considerable amount of energy can be saved whilst controlling the fans in server racks and with 0% PWM control, the fans can even be stopped completely.

Unlike classic plain bearing, Alphacool ES fans have a double ball bearing for increased service life under full load. Double ball bearings are generally regarded as the highest quality bearings in terms of durability and quality. All Alphacool Enterprise fans have multiple protection circuits. If the fans are blocked, they automatically try to restart at reduced speed after a few seconds. Thanks to the soft start, including the emergency start function, the fan can be blocked for up to 72 hours without suffering damage.

Safety Features

• Automatic Shutdown: Automatic switch-off if the fan is blocked
• Automatic restarting: Restart attempt after 2-6 seconds if blocked
• Damage due to blocking: It is guaranteed that the fan will not be damaged if it is blocked for up to 72 hours

MSRP: 20.99€ for the 120 mm model, 22.99€ for the 40 mm models. For more information, visit the product pages of the ES 120 mm, ES 40 mm 10K RPM, and ES 40 mm 15K RPM.