Janitza CTB 31.35 Plug-on Current Transformer 100/5 A Class 1 2.5 VA 1503272

With a 100 A primary current and 5 A secondary output, the Janitza CTB 31.35 plug-on current transformer delivers Class 1 accuracy at 2.5 VA rated burden for precise energy monitoring.

Overview

The Janitza CTB 31.35 is a plug-on current transformer designed for retrofitting onto existing conductors without disconnecting the circuit. It converts a primary current of up to 100 A into a standardized 5 A secondary signal, compatible with most energy meters and power analyzers. The transformer supports busbar dimensions up to 30 x 10 mm and round conductors up to 25 mm in diameter.

What stands out

• Class 1 accuracy ensures reliable measurements for billing and monitoring applications.
• Rated burden of 2.5 VA allows connection to a wide range of measuring instruments.
• Compact plug-on design enables quick installation without interrupting the primary circuit.
• Self-extinguishing polycarbonate housing provides durability and safety.

Technical details

• Primary current: 100 A
• Secondary current: 5 A
• Current ratio: 100/5 A
• Accuracy class: Class 1
• Rated power: 2.5 VA
• Frequency: 50/60 Hz
• Max. operating voltage: 0.72 kV
• Insulation voltage: 3 kV
• Max. busbar dimensions: 30 x 10 mm
• Max. round conductor diameter: 25 mm
• Protection class: IP20
• Operating temperature: -5 °C to +50 °C
• Housing material: self-extinguishing polycarbonate
• Connection: screw terminals
• Standards: IEC 61869-2
• Thermal rated current: 120 A
• Dynamic rated current: 300 A

Our verdict

The Janitza CTB 31.35 is a reliable plug-on current transformer for energy management systems, offering solid accuracy and easy installation in a durable package.