Current transformer 20/1 A
Ratio 20:1 · primary current 20 A, secondary current 1 A
2 CELSA current transformers with a ratio of 20/1 A: Plug-on / winding current transformers (WALO) and Calibrated clip-on current transformers (WALO-E). Accuracy class 0.5 or 1, rated burden 1.5–5 VA. From €66.24 incl. VAT, with datasheet – order online.
Frequently asked questions
What does 20/1 A mean?
With 20 A flowing in the primary conductor, the transformer delivers 1 A to the meter or measuring device – a ratio of 20:1. 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 1.5–5 VA. The VA calculator determines the value. VA calculator →
Which accuracy class?
For 20/1 A the classes 0.5 and 1 are available here. Billing-relevant metering requires class 0.5 or better; for display and monitoring class 1 is usually sufficient. Accuracy class comparison →