Lumel LCTB 7440 Current Transformer, 250A/5A, Busbar Aperture 74/40

The Lumel LCTB 7440 current transformer is a high-precision device engineered for the reliable measurement of alternating currents in electrical power systems. With a transformation ratio of 250A/5A and a specifically designed busbar aperture of 74/40 mm, this transformer facilitates the accurate conversion of high primary currents into manageable secondary signals suitable for monitoring, metering, and protection relays.

Advantages

This current transformer offers exceptional measurement accuracy and long-term stability, ensuring consistent performance in demanding industrial environments. Its robust construction allows for seamless integration into existing power distribution infrastructures, providing a safe and efficient method for galvanic isolation between high-voltage circuits and secondary measurement equipment. The design prioritizes ease of installation, allowing for quick mounting onto busbars while maintaining high operational safety standards.

Suitable for

• Industrial power distribution panels
• Energy management and monitoring systems
• Protection relay circuits
• Electrical sub-metering applications

This device may not be suitable for applications involving direct current (DC) measurement, as it is specifically designed for alternating current (AC) systems. Furthermore, it should not be used in environments where the primary current consistently exceeds the rated 250A capacity, as this may lead to measurement inaccuracies or potential damage to the transformer core.

Key specifications

• Transformation ratio: 250A/5A
• Busbar aperture dimensions: 74 mm x 40 mm
• Application: Alternating current (AC) measurement
• Design: Through-type current transformer

To use the Lumel LCTB 7440, ensure the primary conductor is passed through the central aperture of the transformer. The secondary terminals should be connected to the measuring or protection device using appropriately sized wiring. It is essential to ensure that the secondary circuit is never left open while the primary current is flowing, as this can generate dangerous high voltages.

What to consider before purchase

• Verify that the busbar dimensions do not exceed the 74/40 mm aperture size
• Confirm that the 250A primary current rating matches your system requirements
• Ensure compatibility with your secondary monitoring or protection equipment

For optimal performance and safety, always ensure that all electrical connections are tightened to the manufacturer's specifications and that the transformer is installed by qualified personnel in accordance with local electrical regulations.