ABB 1TNA900341R0105 Current Transformer KORC 4S 105/4

ABB 1TNA900341R0105 Current Transformer KORC 4S 105/4

Let's break down the part number ABB 1TNA900341R0105 Current Transformer KORC 4S 105/4.

This is a standard format for ABB component identification. Here is a detailed explanation of what each segment means:

Part Number Breakdown: 1TNA900341R0105

This is the unique manufacturer's part number.

• 1TNA: This is a common prefix for ABB's low-voltage instrument transformers (like current and voltage transformers) within their product catalog.

• 900341: This is the specific product code or article number that identifies this exact model of current transformer.

• R0105: This is likely a revision or variant code, indicating a specific version or batch of the product.

Technical Designation: KORC 4S 105/4

This is the most important part for understanding the transformer's specifications. It follows a standard industry nomenclature.

• KORC: This indicates the type of current transformer.

◦ KO is a common ABB series designation for ring-type (window-type) current transformers designed for mounting on a busbar or cable.

◦ R often stands for "Rated" or can be part of the specific model family.

◦ C might refer to a specific design variant or accuracy class.

• 4S: This specifies the accuracy class.

◦ The number 4 indicates the accuracy class is 1%. This means the transformer's measurement error is within 1% of the actual current value at its rated primary current.

◦ The letter S indicates the burden (the load impedance the transformer can drive while maintaining its accuracy). In this case, "S" typically corresponds to a standard burden of 2.5 VA (Volt-Amperes).

• 105/4: This defines the current ratio.

◦ 105: The rated primary current is 105 Amperes.

◦ 4: This is not the secondary current, but a bit of a legacy code. It means the rated secondary current is 4 Amps (not the more common 5A or 1A). So, the full ratio is 105/4 A.

Summary of Key Specifications

Feature

Specification

Meaning

Manufacturer

ABB

A leading global technology company.

Type

Ring/Window Type Current Transformer

It has a hole in the center for a conductor to pass through.

Rated Primary Current (Ipn)

105 A

The current it's designed to measure.

Rated Secondary Current (Isn)

4 A

The output current when the primary is at 105A.

Ratio

105/4

For every 105A on the primary, 4A is produced on the secondary.

Accuracy Class

1%

Measurement error is within 1% of the true value.

Rated Burden

2.5 VA

The maximum load it can power while staying accurate.

Mounting

Typically on a busbar or a single core cable.