Plug-on current transformer 250/5 A
Plug-on (window type) current transformer for busbar and cable · ratio 250:5
7 CELSA plug-on current transformers with a ratio of 250/5 A: Plug-on / winding current transformers (ALO). Accuracy class 0.5 or 1, rated burden 1–15 VA, window for round conductors Ø 20–56 mm. From €47.49 incl. VAT, with datasheet, direct from the manufacturer.
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Frequently asked questions
What is a plug-on current transformer?
A plug-on CT is placed on the busbar or cable; the conductor runs through its window and forms the primary winding. It is the standard design for new installations and distribution boards. For retrofits without disconnecting the conductor, choose a split-core CT. Plug-on CTs explained →
What does 250/5 A mean?
With 250 A in the primary conductor, the transformer delivers 5 A to the meter or measuring device – a ratio of 50:1. Meters and instruments are set to this CT ratio.
Will it fit my cable?
The window decides: the types listed here take round conductors of Ø 20–56 mm, depending on the type. The datasheet of each type gives the exact window and busbar dimensions. CT finder →
Which accuracy class?
For plug-on current transformers 250/5 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 →