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2CMA100178R1000 ABB B24 112-100 Three-Phase CT Energy Meter RS-485
ABB B24 112-100 three-phase CT-connected DIN-rail active energy meter for 5 A current transformers, with Class B accuracy, pulse output and RS-485 Modbus RTU communication for 3 x 230/400 V AC energy-monitoring applications.
£184.55
Why Choose the ABB B24 112-100 Energy Meter?
The ABB B24 112-100 is a compact three-phase DIN-rail energy meter designed for transformer-connected measurement using 5 A current transformers. Part of ABB's DIN Rail Mounted Meters range, it provides accurate active energy measurement for three-phase commercial, industrial and building energy-monitoring applications.
Designed for 3 × 230/400 V AC systems, the B24 112-100 provides Class B active-energy accuracy and supports both three-wire and four-wire installations. Its transformer-connected architecture makes it suitable for monitoring circuits where the primary current exceeds the direct measurement capability of conventional DIN-rail meters.
Integrated RS-485 communication with Modbus RTU enables measurement data to be incorporated into compatible building management, automation and energy-monitoring systems. A pulse output, instrumentation values, alarm functionality and an easy-to-read backlit display provide additional flexibility for local and remote energy monitoring.
Key Advantages
- Three-phase CT-connected energy measurement for higher-current electrical installations.
- Designed for use with 5 A secondary current transformers.
- Suitable for 3 × 230/400 V AC three-phase systems.
- Class B / Class 1 active-energy accuracy.
- Integrated RS-485 Modbus RTU communication for remote data acquisition.
- Pulse output for energy monitoring and integration applications.
- Supports multiple electrical instrumentation values including voltage, current, power and power factor.
- Built-in alarm functionality supports monitoring of electrical conditions.
- MID verified and approved for applicable metering installations.
- Compact four-module DIN-rail construction for straightforward panel installation.
Key Features
- ABB B24 series energy meter.
- Three-phase transformer-connected measurement.
- Designed for CT / 5 A connection.
- Maximum meter input current of 6 A.
- 3 × 230/400 V AC nominal system voltage.
- 50/60 Hz operating frequency.
- Active energy measurement.
- Class B (Class 1) active-energy accuracy.
- RS-485 serial communication.
- Modbus RTU communication protocol.
- Integrated pulse output.
- Instrumentation values for detailed three-phase electrical monitoring.
- Alarm functionality.
- Backlit digital display with push-button navigation.
- Supports three-wire and four-wire systems.
- MID and IEC approved.
Three-Phase CT Energy Monitoring with RS-485
The ABB B24 112-100 uses external current transformers with a 5 A secondary, allowing three-phase energy consumption to be measured on circuits with primary currents beyond the direct-connected range of standard DIN-rail meters. This makes the meter particularly suitable for distribution boards, commercial installations and industrial electrical systems where CT-based metering is required.
Its integrated RS-485 interface with Modbus RTU enables energy and instrumentation data to be transmitted to compatible building management, automation and energy-monitoring systems. Together with its pulse output, alarm functionality and locally accessible instrumentation values, the B24 112-100 provides a flexible platform for both standalone and networked three-phase energy monitoring.
Typical Applications
- Commercial building energy monitoring.
- Industrial three-phase energy metering.
- Distribution board and switchboard monitoring.
- CT-connected submetering applications.
- Building management systems using RS-485 communication.
- Modbus RTU energy-monitoring networks.
- Three-phase plant and equipment monitoring.
- Energy efficiency and consumption analysis.
- Tenant, departmental and cost-centre energy monitoring.
- Higher-current circuits requiring external current transformers.
Technical Specifications
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| Measurement Connection Type | CT connection | |
|---|---|---|
| MID Approval | Yes | |
| Device Type | Energy meter | |
| Series | B24 | |
| Product group | DIN Rail Mounted Meters | |
| ABB order code | 2CMA100178R1000 | |
| EAN | 7392696001786 | |
| Product type | Three-phase energy meter | |
| Phase configuration | Three phase | |
| Connection type | Transformer connected | |
| Current transformer connection | CT / 5 A | |
| Maximum meter input current | 6 A | |
| Nominal system voltage | 3 × 230/400 V AC | |
| Operating frequency | 50/60 Hz | |
| Energy measurement | Active energy | |
| Active energy accuracy | Class B / Class 1 | |
| Communication | RS-485 | |
| Communication protocol | Modbus RTU | |
| Output | Pulse output | |
| Instrumentation values | Active power, voltage, current, power factor and frequency | |
| Display | Backlit digital display | |
| Protection rating | IP20 | |
| Operating temperature | -40 to +70 °C | |
| Mounting type | DIN rail | |
| Module width | 4 modules | |
| Approvals | MID verified and approved; IEC approved | |
| Weight | approx. 0.25 kg |
Frequently Asked Questions
What is the ABB B24 112-100 used for?
The ABB B24 112-100 is a three-phase transformer-connected energy meter used to measure active electrical energy in commercial, industrial and building energy-monitoring applications. It is designed for use with external 5 A current transformers.
Does the ABB B24 112-100 require current transformers?
Yes. The B24 112-100 is a CT-connected meter designed for current transformers with a 5 A secondary output. This allows it to monitor circuits with primary currents significantly higher than the meter's own current input.
Does the B24 112-100 support RS-485 communication?
Yes. The meter incorporates an RS-485 serial interface supporting Modbus RTU, allowing energy and instrumentation data to be accessed by compatible monitoring, automation and building management systems.
What electrical system is the ABB B24 112-100 designed for?
The B24 112-100 is designed for three-phase 3 × 230/400 V AC systems and can be used in three-wire and four-wire installations. It provides transformer-connected active energy measurement with Class B / Class 1 accuracy.
Is the ABB B24 112-100 MID approved?
Yes. The B24 112-100 is MID verified and approved and provides Class B active-energy accuracy. It is also IEC approved for three-phase transformer-connected energy measurement.
Trusted ABB Energy Metering
ABB B-series DIN-rail energy meters combine accurate electrical measurement, compact installation and flexible communication capabilities, providing a practical platform for three-phase submetering, energy monitoring and integration with modern building and industrial energy-management systems.
