Why Choose the ABB CMS-121PS 40 A Open-Core Current Sensor?
The ABB CMS-121PS 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 precise current measurement for individual electrical circuits and supports detailed monitoring within compatible ABB InSite installations.
Designed for compatible ABB pro M compact and SMISSLINE installation devices with twin terminals, the CMS-121PS uses an open-core construction that supports convenient installation around the monitored conductor. Its compact format makes it particularly suitable for distribution boards where multiple circuits require individual monitoring without excessive space requirements.
With a measurement range of 0.1–40 A, current accuracy of ≤±1% full scale and an InSite bus flat-cable interface, the CMS-121PS provides dependable circuit-level measurement with straightforward system integration. ABB order code 2CCA880211R0001 identifies this 40 A open-core CMS sensor.
Key Advantages
- Compact 40 A open-core current sensor for branch-circuit monitoring.
- Wide 0.1–40 A measurement range for individual electrical loads.
- Open-core construction supports convenient installation around conductors.
- Designed for compatible ABB pro M compact and SMISSLINE devices with twin terminals.
- Current accuracy of ≤±1% full scale for dependable monitoring.
- Integrates with compatible ABB monitoring systems through the InSite bus flat-cable interface.
Key Features
- ABB CMS Circuit Monitoring System sensor.
- 40 A maximum measurement current.
- 0.1–40 A measurement range.
- 18 mm open-core sensor construction.
- Accuracy class 1.
- Current accuracy of ≤±1% full scale.
- InSite bus flat-cable interface.
- Designed for pro M compact and SMISSLINE installation devices with twin terminals.
- Compact surface-mounted format for distribution equipment.
- Operating ambient temperature range of -25 to +70 °C.
Flexible Circuit Monitoring for Energy Management
Current sensors such as the ABB CMS-121PS provide detailed visibility of individual electrical circuits within a wider energy-management system. Branch-level current measurements can support energy-consumption analysis, load supervision and identification of unusual operating conditions within commercial, industrial and critical-power distribution systems.
The CMS-121PS combines an open-core design with compact dimensions and ABB's InSite flat-cable architecture. This makes it particularly useful where multiple circuits need to be monitored efficiently within compatible pro M compact and SMISSLINE distribution equipment.
Typical Applications
- ABB CMS and InSite energy-monitoring systems.
- ABB pro M compact electrical installations.
- ABB SMISSLINE distribution systems.
- Branch-circuit current monitoring.
- Electrical distribution boards and switchboards.
- Commercial building energy monitoring.
- Industrial electrical load monitoring.
- Data centre and critical-power monitoring.
