Calibrated current transformer 1/5 A
Calibrated current transformer for billing metering · ratio 1:5
One CELSA calibrated current transformer with a ratio of 1/5 A: Calibrated clip-on current transformers (WALO-E). Accuracy class 0.5, rated burden 1.5–5 VA. From €160.41 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 1/5 A mean?
With 1 A in the primary conductor, the transformer delivers 5 A to the meter or measuring device – a ratio of 0.2:1. Meters and instruments are set to this CT ratio.
Which accuracy class?
For calibrated current transformers 1/5 A, class 0.5 is available here. Billing-relevant metering requires class 0.5 or better; for display and monitoring class 1 is usually sufficient. Accuracy class comparison →