ONKA Plug-in Current Transformer 250/5A, 30MM, CLASS 0.5S, 2.5VA (TK302505303 / 80011764)

Snap-on measuring transformer for primary rated current 250 A, secondary current 5 A, rated power 2.5 VA, supplied in accuracy class 0.5S, ONKA.

ONKA TK8010005309 is a highly accurate snap-on current transformer designed for indirect measurement of sinusoidal alternating current in distribution systems and electrical switchboards. It enables safe conversion of a primary current of 1000 A into a standard secondary current of 5 A, compatible with most measuring and control devices.

Technical specifications

Basic parameters

• Primary rated current: 1000 A

• Secondary current: 5 A

• Inner diameter / busbar mounting: 80 mm

• Rated power: 15 VA

• Accuracy class: 0.5S – for reliable and accurate measurements

Installation

• Mounting type: Snap-on transformer

• Mounting feet: Included in the package

• Easy installation: Snap-on design, no interruption of the main circuit

Description

The transformer converts a high primary current (1000 A) into a standard 5 A output, enabling safe connection to:

• meters and ammeters

• controllers and monitoring systems

• protective and measuring circuits

Thanks to the 0.5S accuracy class, it provides stable and precise data even under partial load. Compact dimensions and standard output make it a universal choice for residential, commercial, and industrial applications.

Advantages

• Primary current up to 1000 A – suitable for high-current circuits

• Secondary current 5 A – compatible with most measuring devices

• Accuracy class 0.5S – reliable and stable measurements

• Compact dimensions – suitable even for limited spaces

• Easy installation – snap-on transformer with mounting feet

Usage

• Industrial and residential switchboards

• Systems for measuring and monitoring electrical energy consumption

• Connecting meters, ammeters, and protective automation

• Current load management and consumption monitoring in high-current circuits