Current transformer 250/1 A
Ratio 250:1 · primary current 250 A, secondary current 1 A
27 CELSA current transformers with a ratio of 250/1 A: Plug-on / winding current transformers (ALO), Calibrated clip-on current transformers (ALO-E), Cable conversion current transformer (TC, TQ), Rail conversion current transformer (IAP, IAM) and Protective current transformer (IB-50, IBG-50, IER-1 …). Accuracy class 0.2, 0.2 S, 0.5, 0.5 S, 1, 3 or 5P5–10P10, rated burden 0.2–15 VA. From €33.96 incl. VAT, with datasheet – order online.
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Frequently asked questions
What does 250/1 A mean?
With 250 A flowing 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.
How much burden (VA) do I need?
The rated burden must cover the consumption of the connected devices plus the losses of the measuring line, without being much higher. The types listed here offer 0.2–15 VA. The VA calculator determines the value. VA calculator →
Which accuracy class?
For 250/1 A the classes 0.2, 0.2 S, 0.5, 0.5 S, 1, 3 and 5P5–10P10 are available here. Billing-relevant metering requires class 0.5 or better; for display and monitoring class 1 is usually sufficient. Accuracy class comparison →