Why Choose the ABB B21 112-100 Energy Meter?
The ABB B21 112-100 is a compact single-phase DIN-rail energy meter designed for direct measurement of active electrical energy in residential, commercial and industrial installations. Part of ABB's B-series energy meters, it supports direct connection of loads up to 65 A, eliminating the need for external current transformers in suitable single-phase applications.
Designed for 1 × 230 V AC systems, the B21 112-100 combines Class B active-energy accuracy with an easy-to-read digital display, pulse output and RS-485 communication. Its RS-485 interface supports Modbus RTU, allowing measured energy data to be integrated into building management, energy monitoring and automation systems.
The meter is verified and approved according to the Measuring Instruments Directive (MID) and has IEC approval. Its compact 2-DIN-module construction, infrared communication port and direct 65 A connection make the ABB B21 112-100 a practical solution for sub-metering, consumption monitoring and energy-management applications. ABB order code 2CMA100150R1000 identifies this RS-485 version.
Key Advantages
- Direct connection up to 65 A without external current transformers.
- Designed for single-phase 230 V AC electrical systems.
- RS-485 Modbus RTU communication enables remote energy monitoring and system integration.
- Class B active-energy accuracy for dependable consumption measurement.
- MID approved for applications requiring compliant energy measurement.
- Integrated pulse output for connection to external monitoring equipment.
- Built-in infrared communication interface.
- Compact 2-module DIN-rail format conserves distribution-board space.
Key Features
- ABB B21 series single-phase energy meter.
- Direct-connected measurement up to 65 A.
- Measures active electrical energy.
- 220–240 V AC operating voltage range.
- 50–60 Hz operating frequency.
- Class B (Class 1) active-energy accuracy.
- RS-485 interface with Modbus RTU communication.
- Programmable electrical pulse output.
- Infrared communication port.
- Digital display for local meter readings.
- IP20 protection rating.
- MID verified and IEC approved.
Reliable Single-Phase Energy Monitoring and Communication
The ABB B21 112-100 provides direct active-energy measurement for single-phase circuits with loads up to 65 A. Its Class B accuracy, local digital display and MID approval make it suitable for dependable consumption monitoring, sub-metering and energy-management installations where accurate measurement and straightforward DIN-rail installation are required.
Integrated RS-485 Modbus RTU communication allows energy data to be transferred to compatible monitoring, automation and building-management systems, while the pulse output provides an additional method of transmitting consumption information. The combination of local indication and digital communications makes the B21 112-100 suitable for both stand-alone metering and connected energy-management applications.
Typical Applications
- Residential energy and sub-metering installations.
- Commercial building energy monitoring.
- Industrial single-phase load monitoring.
- Building management systems.
- Energy-management and consumption-monitoring systems.
- RS-485 Modbus connected metering networks.
- Single-phase circuits with loads up to 65 A.
- DIN-rail distribution boards and control panels.
