ABB 1TNA900111R0200 Current Transformer KORC 4L 200/1

Of course. Let's break down the part number ABB 1TNA900111R0200 and its description KORC 4L 200/1.

Part Number Breakdown: 1TNA900111R0200

This is ABB's internal manufacturing code. The structure is identical to the previous model:

1TNA: Standard prefix for ABB's measurement and protection devices.

900111: This is the same unique article number as the 150/1 model, indicating it's from the same base product family.

R0200: This suffix now indicates the variant with a primary current rating of 200A.

Description Breakdown: KORC 4L 200/1

This is the technical description that defines the product's key characteristics.

KORC: Product Series.

This is the same series as before: ABB's KO series of resin-insulated, ring-type (window-type) current transformers. They are known for their reliability and are used in switchgear, panel boards, and substations.

4L: Accuracy Class.

This is identical to the previous model. The 4L class is specifically for metering.

'4' means the accuracy is within ±4% at the rated current.

'L' signifies a low burden, meaning it is designed to be connected to modern energy meters with very low power consumption while maintaining its accuracy.

200/1: Current Ratio.

This is the key difference.

200: The Primary Current (I_p). This transformer is designed for circuits where the normal current is around 200 Amps.

1: The Secondary Current (I_s). The standardized output current remains 1 Amp.

Summary of Key Specifications

Feature Specification Meaning & Comparison

Manufacturer ABB A leading global technology company.

Product Series KORC Identical series: resin-insulated, ring-type current transformer.

Type Window Type (Ring Type) Identical design. The main cable or busbar passes through the center hole.

Primary Current (I_p) 200 A The key difference. Used for measuring a 200A circuit.

Secondary Current (I_s) 1 A Same standardized, safe output current for instruments.

Ratio 200/1 For every 200A in, 1A comes out.

Accuracy Class 4L Identical. For metering, with ±4% accuracy and a low burden.

Insulation Resin Cast Identical. Robust for industrial environments.

What is this used for?

Just like the 150/1 model, this ABB 1TNA900111R0200 (KORC 4L 200/1) is used for precise energy metering and current measurement in low-voltage electrical installations.