Why Choose the ABB CMS-122LA 20 A Open-Core Current Sensor?
The ABB CMS-122LA is a compact open-core current sensor designed for branch-circuit monitoring and energy-management applications. As part of the ABB CMS Circuit Monitoring System, this 18 mm sensor provides accurate current measurement for individual circuits and connects to compatible ABB InSite monitoring equipment through the system's flat-cable bus.
Designed specifically for retrofit applications with ABB System pro M compact and SMISSLINE devices, the CMS-122LA uses an open-core construction that allows convenient installation around an existing conductor. This makes it particularly useful when adding detailed circuit monitoring to existing distribution boards without using a permanently closed sensing core.
With a measurement range of 0.1–20 A, current accuracy of 1% full scale and compatibility with ABB SCU100 and SCU200 control units, the CMS-122LA provides a practical solution for lower-current branch monitoring. ABB order code 2CCA880227R0001 identifies this 20 A pro M retrofit open-core sensor.
Key Advantages
- Compact 20 A open-core current sensor for detailed branch-circuit monitoring.
- Designed for retrofit of System pro M compact and SMISSLINE installations.
- Wide 0.1–20 A measurement range for lower-current electrical loads.
- Open-core construction supports convenient installation around existing conductors.
- 1% full-scale accuracy for dependable circuit-level measurement.
- Integrates with compatible ABB monitoring equipment through the InSite bus flat-cable interface.
Key Features
- ABB CMS Circuit Monitoring System sensor.
- 20 A rated primary current.
- 0.1–20 A measurement range.
- 18 mm open-core sensor construction.
- 10 mm bore diameter.
- Current accuracy of 1% full scale.
- InSite bus flat-cable interface.
- Compatible with ABB SCU100 and SCU200 control units.
- Designed for System pro M compact and SMISSLINE retrofit applications.
- Operating ambient temperature range of -25 to +70 °C.
Practical Retrofit Monitoring for pro M Installations
The ABB CMS-122LA enables existing electrical circuits to be incorporated into a wider energy-monitoring system. Detailed branch-level current information can help operators understand electrical consumption, supervise individual loads and identify changes in circuit behaviour across commercial and industrial distribution systems.
Its open-core construction is particularly useful for retrofit projects because the sensor can be fitted around an existing conductor. Combined with ABB's InSite flat-cable interface, multiple CMS sensors can be integrated efficiently with compatible control units while minimising additional wiring inside the distribution board.
Typical Applications
- ABB System pro M compact retrofit monitoring.
- ABB SMISSLINE retrofit monitoring.
- ABB CMS and InSite energy-monitoring systems.
- Branch-circuit current monitoring.
- Electrical distribution boards and switchboards.
- Commercial building energy monitoring.
- Industrial electrical load monitoring.
- Energy-consumption and load analysis.
