ASK 31.3 - Plug-on current transformer
The plug-on current transformer ASK 31.3 is a compact, high-precision low-voltage measuring transformer of the proven ASK series, specially developed for use in power distribution, switchgear, meter panels and industrial measurement and monitoring systems.
Technical main features:- Type plug-on current transformer (Plug-on Type) – ASK 31.3
- Primary conductor bore For round conductors up to max. Ø 31 mm (cable bore)
- Maximum operating voltage Um ≤ 0.72 kV
- Rated frequency 50–60 Hz
- Insulation class E
- Insulation test voltage 3 kV, 50 Hz, 1 min
- Mounting Plug-on mounting on primary conductor with additional fastening option
The plug-on current transformer ASK 31.3 is characterized by its very compact design, high reliability and excellent linearity – ideal for applications where simple and fast mounting on existing conductors is required (e.g. retrofit, energy monitoring systems and retrofits in control cabinets).
We will be happy to supply this model from stock at short notice or configure further variants of the ASK series for you.
Contact us for your individual offer!
3D models and more files to each product can be found in our download area downloadarea
current transformer knowledge
Background knowledge on the selection, dimensioning and technical parameters of current transformers – prepared in a practical manner.
Read morecurrent transformer correctly select & dimension
Published on 10 July 2026 · Updated on 31 July 2026
The choice of the suitable current transformer depends on primary current, connection values and purpose of use. This guide leads step by step through the most important selection criteria.
Read moreAccuracy classes for current transformers explained
Published on 10 July 2026 · Updated on 31 July 2026
What do specifications like class 0,5 or 0,2s mean for a current transformer? An overview of the common accuracy classes and their areas of application.
Read moreCurrent transformer for photovoltaic systems
Published on 10 July 2026 · Updated on 31 July 2026
In current measurement in PV systems, current transformers are used for recording feed-in, reference and consumption currents. Here you will learn what to pay attention to when selecting and dimensioning.
Read more