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2CCA880226R0001 ABB CMS-121LA 40A Open-Core Current Sensor
ABB CMS-121LA 2CCA880226R0001 is an 18 mm open-core 40 A current sensor with a 0.1–40 A measurement range, accuracy class 1 and InSite bus connectivity for retrofit monitoring of compatible DIN-rail protection devices and SMISSLINE circuits.
£46.92
Why Choose the ABB CMS-121LA 40A Open-Core Current Sensor?
The ABB CMS-121LA, order code 2CCA880226R0001, is a compact 40 A open-core current sensor designed for circuit-level electrical monitoring within ABB InSite energy management systems. Its 18 mm open-core construction is specifically intended for retrofit installation with compatible DIN-rail protection devices and SMISSLINE equipment, making it a practical choice when detailed monitoring needs to be added to an existing distribution board.
The CMS-121LA provides a 0.1–40 A measurement range with accuracy class 1. The open-core design allows the sensor to be fitted around an existing conductor without requiring the conductor to be passed through a permanently closed sensor core, helping simplify retrofit installations and minimise disruption to existing wiring.
Designed for integration into the ABB circuit monitoring architecture, the CMS-121LA communicates through the InSite bus flat-cable interface. Multiple sensors can therefore be incorporated into a scalable monitoring system, providing circuit-level information for energy management, load analysis and improved visibility of electrical distribution systems.
Key Advantages
- Compact 40 A open-core current sensor for circuit-level electrical monitoring.
- Wide 0.1–40 A measurement range for monitoring individual circuits and connected loads.
- Open-core construction simplifies retrofit installation around existing conductors.
- Accuracy class 1 for dependable current measurement.
- Designed for retrofit monitoring of compatible S200, SMISSLINE MCB and SMISSLINE RCBO installations.
- InSite bus flat-cable interface enables straightforward integration with compatible ABB monitoring equipment.
- Compact 18 mm format supports high-density circuit monitoring within electrical distribution boards.
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 compatible DIN-rail protection devices and SMISSLINE equipment.
- Suitable for compatible S200 and SMISSLINE MCBs.
- Suitable for compatible SMISSLINE RCBOs.
- Surface mounting configuration.
- InSite bus communication via flat cable.
- Compact design for scalable multi-circuit energy monitoring systems.
Retrofit Current Monitoring for DIN-Rail Protection Devices
The ABB CMS-121LA is designed to make circuit-level monitoring easier to introduce into existing electrical installations. Its open-core construction enables the sensor to be positioned around an installed conductor, avoiding the need to feed the conductor through a closed sensor core and making the device particularly suitable for retrofit energy monitoring projects.
The 18 mm CMS-121LA is intended for compatible S200 and SMISSLINE miniature circuit breakers and SMISSLINE RCBO applications. Through its InSite bus connection, multiple CMS sensors can be incorporated into a central monitoring architecture, providing detailed circuit information for energy analysis, load monitoring and electrical distribution management.
Typical Applications
- ABB S200 circuit monitoring.
- ABB SMISSLINE MCB and RCBO monitoring.
- Retrofit monitoring of existing electrical distribution boards.
- Branch circuit current monitoring.
- ABB InSite energy management systems.
- Commercial and industrial electrical distribution.
- Energy consumption and electrical load analysis.
- Building and facility energy management systems.
Technical Specifications
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| Mounting Type | Direct mounting | |
|---|---|---|
| Device Type | Split-core CT | |
| Accuracy Class | Class 1 | |
| Series | CMS | |
| Order code | 2CCA880226R0001 | |
| GTIN / EAN | 7612271498610 | |
| Product group | Energy Monitoring Systems | |
| Product type | Open-core current sensor | |
| Rated current | 40 A | |
| Measurement range | 0.1–40 A | |
| Accuracy class | 1 | |
| Precision | 1 | |
| Sensor construction | Open core | |
| Sensor format | 18 mm | |
| Mounting type | Surface mounting | |
| Mounting application | Retrofit of compatible S200 and SMISSLINE MCBs and SMISSLINE RCBOs | |
| Communication interface | InSite bus (flat cable) | |
| Unit weight | 0.012 kg | |
| Packaging unit | 1 piece |
Frequently Asked Questions
What is the ABB CMS-121LA used for?
The ABB CMS-121LA is a 40 A open-core current sensor used for circuit-level electrical monitoring, particularly when monitoring is being retrofitted to compatible DIN-rail protection devices and SMISSLINE installations.
What current range can the ABB CMS-121LA measure?
The CMS-121LA has a specified measurement range of 0.1–40 A and an accuracy class of 1.
Is the ABB CMS-121LA an open-core sensor?
Yes. The CMS-121LA uses an 18 mm open-core construction, allowing it to be installed around an existing conductor and making it particularly suitable for retrofit monitoring applications.
Which devices is the CMS-121LA designed for?
The CMS-121LA is designed for retrofit use with compatible S200 and SMISSLINE MCBs and SMISSLINE RCBOs.
How does the ABB CMS-121LA connect to an energy monitoring system?
The CMS-121LA uses the ABB InSite bus flat-cable interface to communicate with compatible monitoring equipment, allowing multiple sensors to form part of a scalable circuit and energy monitoring system.
Flexible Retrofit Current Monitoring from ABB
ABB CMS open-core current sensors provide compact circuit-level measurement with retrofit flexibility, while the CMS-121LA combines a 40 A measurement range, 18 mm open-core construction and InSite connectivity for monitoring compatible DIN-rail protection devices and SMISSLINE electrical circuits.
