Janitza KUW2/40-400 Split-Core Current Transformer 400/1 A, 28 mm Opening 1503356

With a primary current rating of 400 A and a secondary output of 1 A, the Janitza KUW2/40-400 is a split-core current transformer engineered for precise energy measurement and power monitoring in single-phase installations. Its 28 mm conductor opening accommodates a wide range of cable sizes, while the 0.5 accuracy class and 2.5 VA burden ensure reliable performance for metering and monitoring applications.

Overview

The KUW2/40-400 is a cable-conversion current transformer designed for easy installation without interrupting the primary circuit. The split-core design allows the transformer to be opened and clamped around an existing conductor, making it ideal for retrofitting energy meters and power quality analyzers. With a rated insulation voltage of 3 kV and a maximum operating voltage of 720 V AC, it is suitable for low-voltage power distribution systems operating at 50/60 Hz.

What stands out

• High 400 A primary current rating with 1 A secondary output for standard metering inputs
• Split-core construction for quick, non-invasive installation on existing cables
• 28 mm conductor opening supports a broad range of cable diameters
• Accuracy class 0.5 and 2.5 VA burden for reliable measurement data
• Screw terminal connections for secure wiring

Technical details

• Primary current: 400 A
• Secondary current: 1 A
• Current ratio: 400/1 A
• Conductor opening diameter: 28 mm
• Accuracy class: 0.5
• Rated power (burden): 2.5 VA
• Frequency range: 50/60 Hz
• Max. operating voltage: 720 V AC
• Insulation voltage: 3 kV
• Connection type: Screw terminals
• Mounting type: Cable clamp / split-core
• Protection class: IP20
• Number of phases: Single-phase
• Application: Energy measurement, power monitoring

Our verdict

The Janitza KUW2/40-400 delivers accurate current transformation in a compact, easy-to-install split-core package. Its 400 A rating and 1 A secondary make it a solid choice for energy monitoring in commercial and industrial settings.