ABB 1TNA900141R0310 Current Transformer KORC 4L 310/4

This model is a very specific ABB current transformer. Let's break down the meaning of the model number ABB 1TNA900141R0310 in detail.

This is a complete ABB product ordering code, and its structure contains all the key technical parameters.

Model Decoding: 1TNA900141R0310

According to ABB's naming convention, this code can be broken down as follows:

1TNA: Series code, representing ABB's TRENCH brand current transformers. TRENCH is a top-tier brand under the ABB Group specializing in measurement and protection instrument transformers, known for high quality and accuracy.

900141: Product model or design code. This is a unique code used internally by ABB to identify this specific design.

R0310: Technical parameter code. This is the most critical part, defining the core specifications of the transformer. We can understand it further by decoding "KORC 4L 310/4".

Detailed Technical Parameters: KORC 4L 310/4

This part is directly printed on the device's nameplate and is key for engineers and technicians to quickly identify the device.

KORC:

KO: Represents Bar Primary Type. This means it does not have its own primary winding. Instead, the primary conductor of the main circuit (a busbar or cable) is passed directly through the round hole in the center of the transformer to function. This is one of the most common installation methods.

R: Typically stands for Resin Cast. This indicates that the transformer's insulation is made using epoxy resin cast under vacuum. This structure offers excellent insulation performance, mechanical strength, and resistance to moisture and pollution, making it suitable for both indoor and outdoor environments.

4L:

This indicates the accuracy class of the transformer. For measuring transformers, "L" typically signifies an accuracy class meeting specific standards. Here, "4L" very likely means that within the specified burden and current range, its composite error is ≤ 4%. This is commonly used for electricity metering or load monitoring, where high accuracy is required.

310/4:

310: This is the rated primary current of the current transformer, in Amperes. This means this transformer is designed to measure a primary current of 310A.

4: This is the rated secondary current of the current transformer, in Amperes. This means that when the primary current is 310A, the secondary side will output 4A. 4A is a common secondary current value according to IEC standards, widely used in power systems in Europe, Asia, and other regions (5A is more common in North America).

Summary of Main Characteristics

Characteristic Parameter / Description

Brand/Series ABB (TRENCH)

Model 1TNA900141R0310

Type Bar Primary Current Transformer

Insulation Method Epoxy Resin Cast

Accuracy Class 4L (Composite Error ≤ 4%)

Rated Primary Current (Ipn) 310 A

Rated Secondary Current (Isn) 4 A

Ratio 310 / 4

Typical Applications Electricity Metering, Load Monitoring, System Monitoring