If an AC contactor still produces a humming or buzzing sound after replacement, the issue may not be the contactor itself. Low coil voltage, loose neutral, shading ring issues, unbalanced load, or control circuit faults can cause this problem. This video explains how to identify and troubleshoot these issues step by step in a simple way. ⚙️⚡#Electrical #ACContactor #ElectricalKnowledge #Troubleshooting #ElectricianTips | Bangla Electrical project