Why Choose the ABB A42 312-100 Energy Meter?
The ABB A42 312-100 is an advanced single-phase CT/VT-connected electricity meter designed for accurate monitoring of electrical energy in commercial, industrial and building-services installations. As part of the ABB A42 EQ meter series, this Silver-function meter combines transformer-connected measurement with active and reactive energy monitoring, multi-tariff functionality and RS-485 communication.
Designed for indirect measurement through external current and voltage transformers, the A42 312-100 supports measurement current up to 6 A and a voltage range of 57.7–288 V AC. It measures active and reactive energy in both import and export directions, making it suitable for monitoring both electricity consumption and generation in single-phase systems.
The meter provides Class B (Class 1) active energy accuracy and Class 2 reactive energy accuracy, with up to four tariffs that can be controlled through its inputs or communications interface. Integrated RS-485 communication, two inputs, two outputs, instrumentation values, alarm functionality and a clear LCD display make the A42 312-100 a versatile DIN-rail solution for connected energy-management systems.
Key Advantages
- Advanced single-phase CT/VT-connected energy meter for indirect measurement.
- Measures active and reactive energy in import and export directions.
- Class B (Class 1) active energy accuracy for dependable energy monitoring.
- Class 2 reactive energy accuracy.
- Supports measurement current up to 6 A.
- RS-485 communication supports integration with remote energy-management systems.
- Supports up to four tariffs for detailed consumption and generation monitoring.
- Two digital inputs and two digital outputs provide additional control and monitoring flexibility.
- Instrumentation and alarm functions support detailed electrical system monitoring.
- MID verified and IEC approved for professional metering applications.
Key Features
- ABB A42 EQ meter series.
- Silver functionality level.
- Single-phase transformer-connected electricity meter.
- CT/VT-connected architecture for indirect electrical measurement.
- Measurement current up to 6 A.
- 57.7–288 V AC voltage range.
- Class B (Class 1) active energy accuracy.
- Class 2 reactive energy accuracy.
- Active and reactive energy measurement.
- Import and export energy measurement for four-quadrant monitoring.
- Up to four energy tariffs.
- Tariff control through inputs and communication.
- RS-485 communication.
- Supports Modbus RTU / ABB EQ Bus communications.
- Infrared communication interface.
- Two inputs and two outputs.
- Electrical instrumentation values and alarm functionality.
- LCD display for local meter readings.
- Compact four-module DIN-rail construction.
Reliable Transformer-Connected Energy Monitoring
Transformer-connected energy meters such as the ABB A42 312-100 allow electrical energy to be measured without routing the full primary load current through the meter. External measurement transformers provide reduced current and voltage signals, enabling accurate monitoring of circuits that require indirect metering while maintaining a compact DIN-rail installation.
The A42 312-100 extends basic metering with active and reactive import/export measurement, four-tariff capability, electrical instrumentation and alarm functionality. Its RS-485 interface enables meter data to be integrated into compatible building-management, energy-management and industrial monitoring systems, making it suitable for installations requiring both local readings and centralised data collection.
Typical Applications
- Single-phase CT-connected electrical sub-metering.
- Commercial building energy monitoring.
- Industrial electrical distribution systems.
- Building management systems using RS-485 communications.
- Modbus RTU energy-monitoring networks.
- Import and export energy measurement.
- Renewable energy and distributed-generation monitoring.
- Tenant and departmental electricity allocation.
- Multi-tariff electricity monitoring.
- Energy efficiency and consumption analysis.
