Why Choose the ABB B21 311-100 Energy Meter?
The ABB B21 311-100 is an advanced compact single-phase DIN-rail electricity meter designed for direct-connected energy measurement in residential, commercial and industrial installations. Part of ABB's B21 series, it supports direct measurement of circuits up to 65 A and combines active and reactive energy monitoring with a clear backlit digital display.
As a Silver-level B21 meter, the B21 311-100 measures active and reactive energy in both import and export directions and supports up to four tariffs. It incorporates two digital inputs and two digital outputs that can be used for pulse, tariff-control and alarm functions, together with an infrared communication port for local communication.
The meter provides Class B active-energy accuracy and Class 2 reactive-energy accuracy and is approved and verified according to the Measuring Instruments Directive (MID). Its compact two-module DIN-rail construction makes it particularly suitable for sub-metering, energy management and detailed consumption monitoring. ABB order code 2CMA100154R1000 identifies the B21 311-100 configuration.
Key Advantages
- Direct-connected measurement up to 65 A without external current transformers.
- Measures both active and reactive electrical energy.
- Supports import and export energy measurement for bidirectional monitoring.
- Up to four tariffs enable detailed allocation of electricity consumption.
- Two digital inputs and two digital outputs provide flexible pulse, tariff and alarm functionality.
- Class B active-energy accuracy and Class 2 reactive-energy accuracy.
- MID approved and verified for compliant energy measurement applications.
- Compact 2-module DIN-rail format conserves distribution-board space.
Key Features
- ABB B21 Silver series single-phase energy meter.
- Direct-connected measurement up to 65 A.
- 220–240 V AC single-phase operation.
- Active and reactive energy measurement.
- Separate import and export energy registers.
- Resettable register for intermediate energy values.
- Four-tariff capability.
- 2 digital inputs and 2 digital outputs.
- Outputs configurable for pulse or alarm functions.
- Infrared communication port.
- Backlit digital display for clear local readings.
- Multiple instrumentation values, alarm functions and event logging.
- IP20 protection rating.
Advanced Energy Monitoring with Flexible I/O
The ABB B21 311-100 provides detailed single-phase energy measurement for directly connected circuits up to 65 A. In addition to active energy, it records reactive energy and supports separate import and export registers, making it suitable for applications requiring more detailed information than a basic consumption meter. Four-tariff capability further allows energy usage to be divided according to externally controlled tariff periods.
Two digital inputs and two digital outputs add flexibility for pulse, tariff-control and alarm applications, while the infrared interface provides local communication capability. Combined with its backlit display, alarm functionality, event logging, MID approval and compact DIN-rail construction, the B21 311-100 provides a versatile platform for sub-metering and energy-management installations.
Typical Applications
- Residential energy and sub-metering installations.
- Commercial building energy monitoring.
- Industrial single-phase load monitoring.
- Active and reactive energy measurement.
- Import and export energy monitoring.
- Multi-tariff electricity metering applications.
- Pulse and alarm integration with external monitoring equipment.
- Single-phase circuits with loads up to 65 A.
- DIN-rail distribution boards and control panels.
