Why Choose the ABB CMS-121FH 40A Open-Core Current Sensor?
The ABB CMS-121FH, order code 2CCA880216R0001, is a compact 40 A open-core current sensor designed for circuit-level electrical monitoring within ABB Circuit Monitoring and InSite energy management systems. Its 18 mm open-core construction is specifically designed for the retrofit of ABB E90 fuse holders up to 1000 V DC, providing a practical way to add detailed current monitoring to existing installations.
The CMS-121FH provides a current measurement range of 0.1–40 A with accuracy class 1. Its open-core design allows the sensor to be fitted around an existing conductor without requiring the conductor to be disconnected, making it particularly useful for brownfield upgrades, retrofit energy monitoring and installations where minimising disruption is important.
Measurement data is transmitted digitally through the ABB InSite bus flat-cable interface to compatible monitoring equipment. This enables multiple CMS sensors to be incorporated into a scalable circuit monitoring architecture, providing detailed information about individual electrical loads for energy management, load analysis and electrical distribution monitoring.
Key Advantages
- Compact 40 A open-core current sensor for circuit-level electrical monitoring.
- 0.1–40 A measurement range for monitoring individual circuits and electrical loads.
- Open-core construction simplifies installation around existing conductors.
- Designed specifically for retrofit applications with ABB E90 fuse holders up to 1000 V DC.
- Accuracy class 1 for dependable circuit-level measurement.
- InSite bus flat-cable interface provides digital transmission of measured values.
- Compact 18 mm format supports high-density monitoring in electrical distribution systems.
Key Features
- ABB CMS current monitoring system.
- 40 A current sensor.
- 0.1–40 A measurement range.
- Open-core sensor construction.
- Accuracy class 1.
- 18 mm sensor format.
- Designed for retrofit of ABB E90 fuse holders.
- Suitable for E90 fuse holder applications up to 1000 V DC.
- InSite bus communication via flat cable.
- Surface-mounted sensor configuration.
- Designed for straightforward retrofit installation without disconnecting the monitored conductor.
- Compact and lightweight construction for multi-circuit monitoring systems.
Retrofit Current Monitoring for ABB E90 Fuse Holders
Open-core current sensors provide an effective way to add circuit monitoring to an existing electrical installation. The U-shaped open-core design allows the sensor to be positioned around an installed conductor without requiring the conductor to be disconnected, helping reduce installation work and making the technology particularly suitable for brownfield energy monitoring upgrades.
The ABB CMS-121FH is specifically configured for retrofit monitoring of E90 fuse holders up to 1000 V DC. Once installed, measured current information is transmitted digitally through the ABB InSite bus to compatible monitoring equipment, allowing multiple circuits to be incorporated into a centralised energy management and electrical monitoring system.
Typical Applications
- ABB E90 fuse holder current monitoring.
- Retrofit monitoring of existing electrical installations.
- ABB InSite energy management systems.
- Commercial and industrial distribution boards.
- DC electrical distribution monitoring.
- Energy consumption and electrical load analysis.
- Brownfield energy monitoring upgrades.
- Building and facility energy management systems.
