Reply To: Experience of blade failure


Adding to other comments, some installations where a fan blae has broken did not trip the motor equipped with only mechanical vibration switch especially when operating below 2 Hz. This should be checked with OEM of the switch. If you do not have a good fan guard screen attached to your inlet bell, a broken blade can damage equipment below the ACC as well as being a safety hazard. Most A-framed ACC do have the fan guard but some do not.