Why Choose the ABB CMS-121DR Open-Core Current Sensor?
The ABB CMS-121DR is a compact 40 A open-core current sensor designed for branch-circuit current measurement within ABB CMS and InSite energy monitoring systems. Supplied under ABB order code 2CCA880241R0001, it combines an 18 mm open-core sensor with universal DIN-rail mounting for convenient integration into electrical distribution boards and industrial control panels.
The open-core construction enables the CMS-121DR to be installed around an existing conductor without disconnecting the cable, making it particularly useful for retrofit energy-monitoring projects. Its DIN-rail format provides straightforward panel installation, while the integrated InSite bus flat-cable interface enables connection to compatible ABB monitoring equipment.
With a measuring range of 0.1–40 A and current accuracy of ≤±1% full scale, the CMS-121DR provides dependable branch-level current measurement. Its compact housing and low power consumption make it well suited to multi-channel monitoring applications where numerous individual electrical circuits need to be supervised within limited panel space.
Key Advantages
- 40 A open-core current sensor for branch-circuit monitoring.
- 0.1–40 A measuring range for monitoring individual electrical loads.
- Open-core construction supports retrofit installation without disconnecting the monitored conductor.
- 18 mm sensor format with universal DIN-rail mounting.
- ≤±1% full-scale current accuracy for dependable monitoring data.
- Integrated InSite bus flat-cable interface for connection to compatible ABB monitoring systems.
- Compact design supports high-density monitoring inside distribution boards and control panels.
Key Features
- ABB CMS current monitoring sensor.
- 40 A maximum measuring range.
- 0.1–40 A measurement range.
- 18 mm open-core sensor design.
- DIN-rail mounting for universal-use applications.
- ≤±1% full-scale current accuracy.
- InSite bus flat-cable communication interface.
- 0.18 W power consumption at rated load.
- Operating ambient temperature range of −25 to +70 °C.
Reliable Branch-Circuit Current Monitoring
Current sensors such as the ABB CMS-121DR allow individual electrical circuits to be monitored within a central energy-management system. Branch-level measurement gives electrical engineers and facility operators greater visibility of individual loads, helping them analyse energy consumption, identify changing load conditions and obtain detailed information about electrical distribution performance.
The CMS-121DR is particularly convenient for existing installations because its open-core construction allows the sensor to be fitted around a conductor without requiring the cable to be disconnected. DIN-rail mounting, compact dimensions and ABB system connectivity make it a practical solution for extending multi-channel current monitoring across distribution boards and industrial control panels.
Typical Applications
- Branch-circuit current monitoring in electrical distribution boards.
- ABB CMS and InSite energy-management systems.
- Commercial and industrial energy monitoring.
- Retrofit current monitoring of existing electrical circuits.
- Electrical load and energy-consumption analysis.
- Multi-channel monitoring in switchboards and control panels.
