ABB 1TNA900341R0185 Current Transformer KORC 4S 185/4

ABB 1TNA900341R0185 Current Transformer KORC 4S 185/4

 Let's break down the part number ABB 1TNA900341R0185 Current Transformer KORC 4S 185/4.

This is a standard format for industrial current transformers (CTs), and each segment of the code tells you a specific piece of information.

Detailed Breakdown of the Part Number

1. Manufacturer:

• ABB: A leading global company in power and automation technologies.

2. Product Family / Type:

• 1TNA900341: This is ABB's specific internal "article number" or "order code" for this exact model of current transformer. It uniquely identifies the product in their catalog and ordering system.

3. Technology / Series:

• KORC: This indicates the product series. KORC is a specific line of low-voltage, ring-type (window-type) current transformers from ABB, known for their reliability and common use in energy metering and protection systems.

4. Physical Size / Window Diameter:

• 4S: This specifies the physical size of the transformer, particularly the diameter of the central hole (window) through which the primary conductor passes.

◦ In the KORC series, 4S typically corresponds to a window diameter of 40 mm.

5. Current Ratio (The most critical specification):

• 185/4: This defines the current transformation ratio.

◦ 185: The primary rated current (Ipn). This CT is designed to be used on a circuit where the normal full-load current is around 185 Amps.

◦ 4: The secondary rated current (Isn). This is the current that the CT will output when the primary current is at its rated value. A 5A secondary is more common for protection relays, but a 1A or 4A secondary is sometimes used, especially for metering or to reduce burden over long cable runs. In this case, it is 4 Amps.

◦ What this means: When 185 Amps flow through the primary conductor, the CT will produce a proportional output of 4 Amps. The ratio is linear (e.g., at 92.5 A primary, the output will be 2 A).

6. Other Implied Specifications:

• Type: Ring-type or Window-type. This means it does not have a built-in primary winding. The main power cable itself acts as the single-turn primary conductor by passing it through the hole.

• Class: While not explicitly stated in the code, a KORC CT like this is typically used for Measurement (Metering) Class or Protection Class (e.g., 5P or 10P). The exact class (accuracy level) would be found on the nameplate or in the detailed datasheet.

• Frequency: Designed for standard power frequencies, most commonly 50/60 Hz.

• Rated Insulation Voltage: For KORC series CTs, this is typically 0.72 kV, making them suitable for low-voltage applications.

Summary of Key Specifications:

Feature

Specification

Manufacturer

ABB

Series

KORC

Type

Window-type (Ring-type)

Window Diameter

40 mm (approx.)

Rated Primary Current (Ipn)

185 A

Rated Secondary Current (Isn)

4 A

Ratio

185:4

Typical Use

Energy Metering, Protection Relays