Janitza 400/5 - CTB 31.35 Clip-On Current Transformer Primary Current 400 A 1 pc (1503277)

In industrial power monitoring, accurate current measurement is essential. The Janitza 400/5 - CTB 31.35 clip-on current transformer is used by electricians and panel builders to measure AC currents up to 400 A in low-voltage distribution systems. It converts a primary current of 400 A to a secondary current of 5 A, compatible with standard measuring instruments and energy meters.

Key specifications

• Primary current: 400 A
• Secondary current: 5 A
• Accuracy class: 1
• Rated power: 2.5 VA
• Max. operating voltage: 0.72 kV
• Frequency: 50/60 Hz
• Conductor opening: 31 x 35 mm
• Transformer type: Solid-core (pass-through)
• Mounting: Cable tie, screw, DIN rail (with adapter)
• Housing material: Self-extinguishing polycarbonate
• Operating temperature: -25 to +50 °C
• Protection class: IP20
• Standards compliance: IEC 61869-2
• Connection: Screw terminals
• Overcurrent limiting factor: FS 5
• Number of phases: Single-phase

Why choose it

This transformer offers reliable and accurate current measurement for energy management systems. Its solid-core design ensures long-term stability, and the compact dimensions allow installation in tight spaces. The self-extinguishing polycarbonate housing provides safety in electrical installations.

Ideal use cases

• Energy monitoring in industrial control panels
• Sub-metering for building management systems
• Retrofit installations where a split-core transformer is not required

Good to know

The transformer is designed for single-phase applications and can be mounted using cable ties, screws, or a DIN rail adapter (adapter not included unless specified). It complies with IEC 61869-2 for current transformers.