2CSG280325R1000 ABB CT1M-3 400 Current Transformer 400/5 A

Why Choose the ABB CT1M-3 400 Current Transformer?

The ABB CT1M-3 400 is a compact and reliable 400/5 A current transformer designed for indirect measurement of electrical network parameters in low-voltage distribution systems. Supplied under ABB order code 2CSG280325R1000, it forms part of the ABB CT1M current transformer series and is designed in accordance with IEC 61869-2.

With a rated primary current of 400 A and a rated secondary current of 5 A, the CT1M-3 400 converts primary circuit current into a proportional standard secondary signal for compatible electricity meters, ammeters, power analysers and monitoring equipment. Its class 0.5 accuracy and 5 VA rated output at class 0.5 support accurate electrical measurement in commercial and industrial installations.

The CT1M-3 400 uses a through-primary design suitable for cables up to 26 mm and horizontal busbars up to 30 × 10 mm or 25 × 15 mm. Its compact 70 × 50 × 31 mm enclosure, IP20 degree of protection and 50–60 Hz rated frequency make it a practical metering accessory for switchboards, distribution panels and energy monitoring systems.

Key Advantages

• Reliable 400/5 A current transformation for indirect electrical measurement.
• Class 0.5 accuracy supports precise metering applications.
• 5 VA rated output at accuracy class 0.5.
• Standard 5 A secondary output for compatible measuring equipment.
• Through-primary construction simplifies installation around cables and busbars.
• Accommodates cables up to 26 mm in diameter.
• Suitable for horizontal busbars up to 30 × 10 mm or 25 × 15 mm.
• Busbar and mounting-foot fixings are supplied as standard.
• Optional DIN-rail installation using the appropriate CT1M-3 DIN Rail Adapter.
• Designed in accordance with IEC 61869-2 for current transformers.

Key Features

• ABB CT1M-3 current transformer series.
• 400 A rated primary current.
• 5 A rated secondary current.
• 400/5 A transformation ratio.
• Class 0.5 measurement accuracy.
• 5 VA rated output at class 0.5.
• 6.25 VA rated output at class 1.
• 6.25 VA rated output at class 3.
• FS 5 current limiting factor.
• 50–60 Hz rated frequency.
• IP20 degree of protection.
• Compact through-primary construction for cable and horizontal busbar installations.

Reliable Indirect Current Measurement

Current transformers allow electrical meters and monitoring instruments to measure circuits carrying currents above their direct-input range. The ABB CT1M-3 400 transforms a primary current of up to 400 A into a proportional 5 A secondary current, allowing compatible equipment to perform indirect measurement of electrical network parameters.

The CT1M range is designed for current measurement in main and sub-distribution systems. The CT1M-3 400 combines class 0.5 accuracy with a practical through-primary opening for cables and horizontal busbars, while its standardised 5 A secondary output supports integration with compatible metering and monitoring equipment.

Typical Applications

• Electrical energy metering systems.
• Main and sub-distribution switchboards.
• Low-voltage electrical distribution panels.
• Power and network monitoring systems.
• Building energy management installations.
• Industrial electrical measurement systems.
• Panel-mounted ammeters and power analysers.
• Busbar current measurement applications.