Calibrated current transformer 250/5 A
Calibrated current transformer for billing metering · ratio 250:5
7 CELSA calibrated current transformers with a ratio of 250/5 A: Calibrated clip-on current transformers (ALO-E). Accuracy class 0.2, 0.2 S, 0.5 or 0.5 S, rated burden 1–15 VA, window for round conductors Ø 20–56 mm. From €105.47 incl. VAT, with datasheet, direct from the manufacturer.
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Frequently asked questions
When do I need a calibrated current transformer?
Whenever energy is billed to third parties based on the measurement (e.g. sub-metering for tenants), legal metrology requires a calibrated transformer together with a MID meter. ALO-E and WALO-E are conformity-assessed; the type is approved by PTB. Calibration and MID →
What does 250/5 A mean?
With 250 A in the primary conductor, the transformer delivers 5 A to the meter or measuring device – a ratio of 50:1. Meters and instruments are set to this CT ratio.
Will it fit my cable?
The window decides: the types listed here take round conductors of Ø 20–56 mm, depending on the type. The datasheet of each type gives the exact window and busbar dimensions. CT finder →
Which accuracy class?
For calibrated current transformers 250/5 A, the classes 0.2, 0.2 S, 0.5 and 0.5 S are available here. Billing-relevant metering requires class 0.5 or better; for display and monitoring class 1 is usually sufficient. Accuracy class comparison →