i Power loss

Power loss

QUESTION:

How to calculate power loss of contactors which is generally required for thermal calculations of a switchboard.

ANSWER:

The power losses of contactors can be calculated as follows:

- with DC-operated contactors: Closed power consumption of magnet coil- with AC-operated contactors: Closed power consumption of magnet coil x cos phi
Note: The above coil power consumptions and power losses per current path


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