Connector mismatch is one of the most common causes of failed cooling fan replacements. Before you buy a replacement, confirm both the wire count and the connector style.

2-Wire Fans

These usually provide basic power only. They are common in simpler applications where speed feedback is not required.

3-Wire Fans

3-wire fans often add a tach signal for speed monitoring. They are common in PC, industrial and embedded systems.

4-Wire PWM Fans

4-wire fans typically support PWM speed control. In many server and industrial applications, replacing them with the wrong connector type can cause alarms, speed issues or startup problems.

What to Photograph for Matching

• The fan label
• The connector front and side view
• The full wire harness
• The mounting orientation if space is tight

Do Not Match by Connector Alone

Always match dimensions, voltage and application requirements as well. A correct plug does not guarantee the motor and airflow specs are suitable.

Need Connector Help?

Send clear connector photos through our Photo Support page, or use the Replacement Guide to narrow your options first.