How many overload units are required for a 3-phase motor?

In a 3-phase motor, three overload units are required, one for each phase. Overload protection is essential in electrical systems to prevent motor burnout caused by excessive current. Each phase of a 3-phase motor operates independently, meaning that in the event of an overload, it is crucial to monitor and protect each phase separately.

Utilizing three overload units allows for individual protection for each phase, ensuring that if one phase encounters an issue, the others can continue to operate, and the overload unit for the affected phase can trip to prevent damage. This setup aligns with standard practices in motor protection, enhancing system reliability and safety in industrial applications.

Having fewer than three overload units would not provide adequate protection for a multi-phase system, while having more than three would be unnecessary for a typical 3-phase motor configuration.