Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning switchfuses, ratings and phases, is answered by ABB:
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| Is a switchfuse rating 'per phase'? |
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Question: When a TP&SN switchfuse is rated at 100A, is that 'per phase'? Or is it the total current drawn through the complete switchfuse?
Answer: The rating of a TP&N switch is shown 'per phase' when run on a three-phase supply.
If you run the poles in parallel on a single-phase, there is a de-rating factor. Note that this de-factor depends upon the switchfuse model.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
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