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Siemens 4NC5223-2DE21 250/5A Current Transformer — Class 0.5

Siemens 4NC5223-2DE21 precision current transformer for high-accuracy needs.

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ManufacturerSiemens

Part number4NC5223-2DE21

Primary Current 250A

Secondary Current 5A

VA Rating 5 VA

Accuracy Class 0.5

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CAGE: 9NK75

High accuracy measurement 250/5A ratio Class 0.5 accuracy 5 VA rating Reliable performance Siemens quality

Product description

The Siemens 4NC5223-2DE21 is a precision current transformer engineered for enhanced accuracy in demanding electrical applications. It offers a 250A primary to 5A secondary current ratio, a 5 VA apparent power rating, and a superior accuracy Class of 0.5. This makes it ideal for applications where even small deviations in current measurement need to be minimized.

This transformer is widely used in metering, protective relaying, and high-accuracy industrial monitoring systems. Its dependable performance ensures the safety and efficiency of power systems, providing critical data for operational control and fault detection.

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Technical specifications

Primary Current	250A
Secondary Current	5A
VA Rating	5 VA
Accuracy Class	0.5
Manufacturer	Siemens

Common applications

High-accuracy metering

Protective relaying

Power quality monitoring

Industrial automation

Substation equipment

Test and measurement

Compatible systems

Metering panels Protection relays Industrial control systems Siemens electrical distribution

Also known as

Siemens 4NC5223-2DE21 CT 250A 5A current transformer Siemens precision CT

Replaces / compatible with

This high-accuracy current transformer is suitable for applications requiring precise current measurement and protection, often replacing older or less accurate metering-grade transformers.

Technical note

Expert tip

For optimal performance with the 5A secondary, ensure the connected burden does not exceed the specified 5 VA to maintain Class 0.5 accuracy.

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Frequently asked questions

Why is the Class 0.5 rating important for the Siemens 4NC5223-2DE21?

The Class 0.5 rating signifies that the Siemens 4NC5223-2DE21 current transformer has a very low error tolerance, typically within 0.5% of the actual current value. This high level of accuracy is critical for applications like revenue metering and sensitive protection schemes.