Protection current transformer 250/1 A
Protection current transformer for protection relays · ratio 250:1
6 CELSA protection current transformers with a ratio of 250/1 A: Protective current transformer (IB-50, IBG-50, IER-1 …). Accuracy class 5P5–10P10, rated burden 1.25–7.5 VA, window for round conductors Ø 23–80 mm. From €59.76 incl. VAT, with datasheet, direct from the manufacturer.
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Frequently asked questions
What does 5P10 mean?
Protection CTs transmit even high overcurrents faithfully so that protection relays trip reliably. In 5P10, "5P" means a composite error of at most 5 %, "10" is the accuracy limit factor: the limit holds up to 10 times the rated current. Available here for 250/1 A: 5P5, 5P10, 10P5 and 10P10. Protection CTs explained →
What does 250/1 A mean?
With 250 A in the primary conductor, the transformer delivers 1 A to the meter or measuring device – a ratio of 250:1. Meters and instruments are set to this CT ratio. The 1 A secondary keeps cable losses low on long measuring lines.
Will it fit my cable?
The window decides: the types listed here take round conductors of Ø 23–80 mm, depending on the type. The datasheet of each type gives the exact window and busbar dimensions. CT finder →