Janitza Split-Core Current Transformer 400/5A Class 1, 28mm Opening 1503357

With a 400A primary and 5A secondary, this split-core current transformer delivers Class 1 accuracy for energy monitoring and power quality applications.

Overview

The Janitza 1503357 is a cable conversion current transformer with a 400A to 5A ratio and Class 1 accuracy. It is designed for retrofitting onto existing conductors without disconnecting them, thanks to its split-core design and 28mm inner diameter. The transformer operates at 50/60Hz and supports a rated burden of 2.5VA, making it suitable for connection to measuring instruments and energy meters.

What stands out

• Split-core design allows installation without interrupting the primary circuit
• Class 1 accuracy ensures reliable measurement for billing and monitoring
• 28mm opening accommodates common cable diameters
• Wide operating temperature range from -25°C to +50°C

Technical details

• Transformer type: Split-core current transformer
• Current ratio: 400A / 5A
• Accuracy class: Class 1
• Rated power (burden): 2.5 VA
• Inner diameter: 28 mm
• Frequency: 50/60 Hz
• Max. operating voltage: 0.72 kV (720V)
• Insulation test voltage: 3 kV (1 min)
• Overcurrent limit factor: FS5
• Operating temperature: -25 °C to +50 °C
• Storage temperature: -40 °C to +70 °C
• Housing material: Self-extinguishing polycarbonate
• Protection class: IP20
• Connection: Screw terminals
• Mounting: Cable tie, base plate
• Standard: IEC 61869-2

Our verdict

A reliable split-core CT for retrofitting energy measurement in existing installations, with solid accuracy and a practical 28mm opening.