Janitza KUW2/40-250/5A Split-Core Current Transformer 250/5A Class 1 5VA 40mm Cable Opening

The Janitza KUW2/40-250/5A stands out as a retrofittable split-core current transformer that eliminates the need to disconnect primary conductors. Its hinged opening accommodates cables up to 40 mm in diameter, making it ideal for retrofitting into existing installations without interrupting power. With a 250 A primary rating and a standard 5 A secondary, it integrates seamlessly with common measurement and protection devices.

Highlights

• Split-core design for easy installation on existing cables
• Primary current: 250 A; secondary current: 5 A
• Accuracy class 1 with rated burden 5 VA
• Maximum cable diameter: 40 mm
• Self-extinguishing polycarbonate housing (UL94-V0)
• Complies with IEC 61869-2

In daily use

Installation is straightforward: open the core, place it around the conductor, and secure it with the integrated locking mechanism or cable ties. The transformer can be mounted on a base plate or DIN rail using an optional adapter. Screw terminals ensure reliable secondary connections. The wide operating temperature range from -25 °C to +50 °C and robust housing make it suitable for industrial environments.

Full specifications

• Transformer type: Split-core current transformer
• Primary current rating: 250 A
• Secondary current rating: 5 A
• Transformation ratio: 250/5 A
• Accuracy class: Class 1
• Rated power (burden): 5 VA
• Max. cable diameter: 40 mm
• Frequency: 50/60 Hz
• Rated insulation voltage: 3 kV
• Overcurrent limit factor: FS 5
• Rated short-time thermal current: 60 x In / 1s
• Rated dynamic current: 2.5 x Ith
• Operating temperature range: -25 °C to +50 °C
• Housing material: Self-extinguishing polycarbonate (UL94-V0)
• Mounting type: Cable tie, base plate, DIN rail (with optional adapter)
• Connection type: Screw terminals
• Standards compliance: IEC 61869-2

Final note

A dependable choice for energy monitoring and protection in retrofit scenarios, the KUW2/40-250/5A combines ease of installation with solid performance and compliance.