2CSG280335R1000 ABB CT1M-3 500 Current Transformer 500 A/5 A

Why Choose the ABB CT1M-3 500 Current Transformer?

The ABB CT1M-3 500, order code 2CSG280335R1000, is a 500 A/5 A through-primary current transformer designed for indirect measurement of electrical parameters in metering, monitoring and energy management applications. Part of ABB's Metering Accessories range, it transforms higher primary currents into a standardised 5 A secondary current for compatible electricity meters, ammeters, multimeters and network measuring instruments.

As part of the ABB CT1M current transformer series, the CT1M-3 500 is designed in accordance with IEC 61869-2 and uses a through-primary construction. The monitored cable or horizontal busbar passes through the transformer aperture, providing a practical current sensing solution for electrical distribution panels, switchboards and energy monitoring systems.

With a 500 A rated primary current, 5 A rated secondary current and accuracy class 0.5, the CT1M-3 500 provides a 500:5 transformation ratio for accurate indirect electrical measurement. It provides 5 VA at class 0.5, 6.25 VA at class 1 and 7.5 VA at class 3, while its CT1M-3 aperture accommodates cables up to 26 mm and horizontal busbars up to 30 × 10 mm or 25 × 15 mm.

Key Advantages

• Purpose-designed current transformer for indirect electrical measurement.
• 500 A/5 A current ratio for higher-current metering and monitoring applications.
• Accuracy class 0.5 supports precise current and energy measurement.
• 5 VA rated output at class 0.5 for accurate metering applications.
• Accommodates cables up to 26 mm and horizontal busbars up to 30 × 10 mm or 25 × 15 mm.
• Busbar and mounting feet fixings are supplied as standard.
• Optional CT1M-3 DIN Rail Adapter enables DIN rail installation where required.

Key Features

• ABB CT1M-3 current transformer series.
• 500 A rated primary current.
• 5 A rated secondary current.
• 500:5 current transformation ratio.
• Accuracy class 0.5.
• 5 VA rated output at class 0.5.
• 6.25 VA rated output at class 1.
• 7.5 VA rated output at class 3.
• 50–60 Hz rated frequency.
• IP20 protection rating.
• Through-primary construction for cable and horizontal busbar installations.
• Designed in accordance with IEC 61869-2.

Reliable Indirect Measurement for Electrical Systems

Current transformers allow meters and measuring instruments to monitor electrical circuits carrying currents above their direct measurement range. The transformer produces a proportional secondary current, allowing electrical parameters to be measured without routing the full primary circuit current through the connected measuring instrument.

The ABB CT1M-3 500 converts a nominal 500 A primary current into a 5 A secondary current. Its class 0.5 accuracy, generous conductor aperture and through-primary construction make it suitable for integrating accurate indirect current measurement into commercial and industrial electrical distribution, power monitoring and energy management systems.

Typical Applications

• Electrical energy metering systems.
• Commercial and industrial distribution panels.
• Electrical switchboards and control cabinets.
• Indirect measurement of circuits up to 500 A nominal current.
• Energy monitoring and management systems.
• Current measurement with compatible ammeters, multimeters and energy meters.
• Cable and horizontal busbar current measurement.
• Panel-building and electrical instrumentation applications.