Calibrated current transformer 500/1 A
Calibrated current transformer for billing metering · ratio 500:1
10 CELSA calibrated current transformers with a ratio of 500/1 A: Calibrated clip-on current transformers (ALO-E). Accuracy class 0.2, 0.2 S, 0.5 or 0.5 S, rated burden 1–10 VA, window for round conductors Ø 28–85 mm. From €111.04 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 500/1 A mean?
With 500 A in the primary conductor, the transformer delivers 1 A to the meter or measuring device – a ratio of 500:1. 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 28–85 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 500/1 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 →