WAGO 855-4105/250-101 Split-Core Current Transformer 250/1A Class 1

The WAGO 855-4105/250-101 is a high-quality split-core current transformer designed for accurate measurement of AC currents up to 250 A. With a secondary output of 1 A and a transformation ratio of 250/1 A, it is ideal for energy monitoring, metering, and protection applications in industrial and commercial installations. The transformer features a compact design with a maximum conductor diameter of 25.5 mm, suitable for round or rectangular busbars. Its split-core construction allows for easy installation without disconnecting the primary conductor.

Advantages

Easy installation thanks to split-core design; high accuracy Class 1 at 2.5 VA burden; wide frequency range 50/60 Hz; robust polyamide housing with IP20 protection; versatile mounting options including cable, DIN-rail, and screw mounting.

Suitable for

• Energy management systems
• Sub-metering applications
• Industrial automation
• Power distribution monitoring

Key specifications

• Primary current: 250 A
• Secondary current: 1 A
• Transformation ratio: 250/1 A
• Accuracy class: Class 1 (at 2.5 VA)
• Rated power (burden): 2.5 VA
• Max. conductor diameter: 25.5 mm
• Max. busbar dimensions: 25.5 x 25.5 mm
• Frequency: 50/60 Hz
• Rated insulation voltage (Um): 1 kV
• Rated impulse withstand voltage: 3 kV
• Operating temperature: -5 °C to +50 °C
• Storage temperature: -25 °C to +70 °C
• Mounting type: Cable, DIN-rail, screw mounting
• Housing material: Polyamide (PA)
• Protection type: IP20
• Connection type: Screw clamp terminal

Recommendations

For optimal accuracy, ensure the secondary burden does not exceed 2.5 VA. Use appropriate fusing and safety measures during installation. This transformer is suitable for indoor use only.