Current transformer 40/5 A
Ratio 40:5 · primary current 40 A, secondary current 5 A
2 CELSA current transformers with a ratio of 40/5 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 €62.67 incl. VAT, with datasheet – order online.
Frequently asked questions
What does 40/5 A mean?
With 40 A flowing in the primary conductor, the transformer delivers 5 A to the meter or measuring device – a ratio of 8:1. Meters and instruments are set to this CT ratio.
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 40/5 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 →