NZR Split-Core Current Transformer TQ40 300/1A, Class 1, 2.5 VA, Ø40 mm 42600300

Monitor electrical consumption in industrial and commercial distribution boards with the NZR TQ40 split-core current transformer. Designed for retrofitting into existing installations without disconnecting cables, it converts a primary current of 300 A into a secondary current of 1 A for safe connection to measuring instruments, energy meters, or building management systems.

Key specifications

• Transformation ratio: 300 A / 1 A
• Accuracy class: 1
• Rated power (burden): 2.5 VA
• Rated insulation voltage: 0.72 kV
• Rated frequency: 50/60 Hz
• Overcurrent limit factor: FS 5
• Maximum cable diameter: 40 mm
• Maximum busbar dimensions: 40 x 10 mm or 30 x 30 mm
• Mounting: cable tie, base plate, or DIN rail with adapter
• Insulation class: E
• Protection class: IP20
• Operating temperature: -5°C to +50°C
• Standards: IEC 61869-2

Why choose it

The split-core design allows quick installation around existing conductors without interrupting power. Its Class 1 accuracy ensures reliable measurement for energy management and billing support.

Ideal use cases

• Retrofitting energy meters in distribution panels
• Monitoring current in building automation systems
• Sub-metering for tenant billing

Good to know

The transformer is suitable for conductors up to 40 mm in diameter and can be secured with cable ties or mounted on a DIN rail using an adapter.