Calibrated current transformer 50/1 A
Calibrated current transformer for billing metering · ratio 50:1
One CELSA calibrated current transformer with a ratio of 50/1 A: Calibrated clip-on current transformers (ALO-E). Accuracy class 0.5, rated burden 1–2.5 VA, window for round conductors Ø 27 mm. From €220.02 incl. VAT, with datasheet, direct from the manufacturer.
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 50/1 A mean?
With 50 A in the primary conductor, the transformer delivers 1 A to the meter or measuring device – a ratio of 50:1. 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 27 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 50/1 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 →