Zyvpee U40G12BS4AB5-57 A251 40mm 4 Pin Maglev Case Fan

Compact 40 mm Maglev Fan

The Zyvpee U40G12BS4AB5-57 A251 is a 40 mm case fan built around a NIDEC 4020 motor with magnetic-levitation bearing. It targets builders who need a slim 20 mm thick cooler for tight chassis spaces or small-form-factor enclosures. The 4-pin PWM connector allows motherboard speed control without extra adapters. Its non-LED black frame keeps the look neutral for any build theme.

Fits 40 mm Mounts with Four-Pin Headers

The fan mounts directly to standard 40 mm hole patterns and draws 0.12 A at 12 V through its 4-pin connector. No separate fan controller or Molex adapter is required when a PWM header is available. The Maglev bearing eliminates physical contact, reducing friction and freeing up long-term reliability compared with sleeve or ball bearings. Builders without a 4-pin header or with only 40 mm clearance in other axes cannot use this unit.

Steady Airflow from Magnetic Bearing

Under continuous load the Maglev design maintains consistent rotation without the wear-in period that affects contact bearings. The 12 V 0.12 A rating delivers stable current draw so motherboard fan curves remain predictable over extended sessions. Acoustic output stays uniform because the rotor floats without mechanical resonance. The thin 20 mm profile limits maximum static pressure, so dense radiator stacks are not a suitable match.