Why Choose the ABB CT1M-4 400 Current Transformer?
The ABB CT1M-4 400 is a compact and reliable 400/5 A current transformer designed for indirect measurement of electrical parameters in low-voltage distribution systems. Supplied under ABB order code 2CSG280385R1000, 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-4 400 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-4 400 uses a through-primary design suitable for cables and busbars. The CT1M-4 format accommodates cables up to 31 mm and horizontal or vertical busbars up to 40 × 10 mm or 30 × 20 mm. Its compact 78 × 62 × 40 mm construction, 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 31 mm.
- Suitable for horizontal and vertical busbars up to 40 × 10 mm or 30 × 20 mm.
- Busbar and mounting-foot fixings are supplied as standard.
- Optional DIN-rail installation using the CT1M-4/5/6/7 DIN Rail Adapter.
- Designed in accordance with IEC 61869-2 for current transformers.
Key Features
- ABB CT1M-4 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.
- 5 VA rated output at class 1.
- 7.5 VA rated output at class 3.
- 50–60 Hz rated frequency.
- IP20 degree of protection.
- Compact through-primary construction for cable and busbar installations.
Current transformers allow electrical meters and monitoring instruments to measure circuits carrying currents above their direct-input range. The ABB CT1M-4 400 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 electrical distribution systems. The CT1M-4 400 combines class 0.5 accuracy with a practical through-primary opening for cables and 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.
