Bender CTAC120 Measuring Current Transformer

Description

Bender CTAC120 Measuring Current Transformer

Product Dimensions：

The Bender CTAC120 is a highly sensitive, window-type measuring current transformer (CT) from the LINETRAXX® CTAC series. It is specifically designed to work in conjunction with Bender’s residual current monitors (RCM/RCMS series) and insulation fault location systems (EDS series).

Product Detailed Description

The CTAC120 is an essential component for monitoring residual currents in earthed (TN/TT) systems or locating insulation faults in unearthed (IT) systems. It features a large 120 mm inner diameter, allowing it to accommodate large cable bundles or busbars. By encircling all current-carrying conductors (including the neutral, but excluding the protective earth), the CTAC120 detects the vector sum of currents; any non-zero result indicates a leakage or fault current.

Technical Parameters

Product Advantages

• High Sensitivity: Capable of detecting very low residual currents, starting from as low as 100 mA (depending on the connected evaluator), enabling early fault detection before damage occurs.
• Large Aperture: The 120 mm window is ideal for heavy-duty industrial applications where large-diameter cables or multiple conductors are used.
• Wide Frequency Response: With a range from 15 Hz up to 100 kHz, it is suitable for modern power systems with high-frequency harmonics or variable speed drives.
• Seamless Integration: Fully compatible with the Bender ecosystem, providing plug-and-play functionality with RCMS460/490 monitors and EDS440 fault locators.

Important Considerations (Precautions)

• Conductor Routing: All active conductors (L1, L2, L3, and N) must pass through the CT window. The protective earth (PE) conductor must never pass through the CT.
• Shielding: Do not route shielded cables through the CTAC120. If a shielded cable must pass through, the shield must be pulled back and grounded outside the CT window.
• Centering: For maximum accuracy, conductors should be centered within the transformer and not bent sharply immediately before or after the CT.
• Testing: Regular “bump tests” via the connected RCM device are recommended to ensure the entire measurement loop is operational.

Product Applications

• Data Centers & Hospitals: Continuous monitoring of leakage currents to prevent unplanned downtime in critical facilities.
• Industrial Plants: Early detection of insulation degradation in large motors, heaters, or distribution panels.
• IT Systems (Unearthed): Working as a “locating CT” in Insulation Fault Location Systems (EDS) to pinpoint the exact branch where a fault has occurred.
• Fire Prevention: Monitoring for residual currents in buildings to reduce the risk of electrical fires caused by insulation failure.

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