Why Choose the ABB A44 452-100 Energy Meter?
The ABB A44 452-100 is an advanced three-phase CT-connected electricity meter designed for accurate energy monitoring in industrial, commercial and building-services installations. Part of the ABB A44 EQ meter series, this Gold-function meter combines high-accuracy transformer-connected measurement with active and reactive energy monitoring, multi-tariff functionality and integrated RS-485 communications.
Designed for indirect measurement through external current transformers, the A44 452-100 has a rated measurement current of 1 A and supports input current up to 6 A. It can be used on 3-wire or 4-wire three-phase systems across a wide 3 × 57.7/100–288/500 V AC voltage range, while configurable transformer ratios allow the meter to calculate primary-system energy values.
The A44 452-100 measures active and reactive energy in import and export directions, with Class C / Class 0.5 S active energy accuracy and Class 2 reactive energy accuracy. Integrated RS-485 communication using Modbus RTU or ABB EQ Bus, four-tariff capability, two digital inputs, two digital outputs, demand monitoring, previous values, event logging and an 8-channel load profile make it a comprehensive solution for connected energy-management systems.
Key Advantages
- Advanced three-phase transformer-connected energy meter for indirect measurement.
- Gold functionality level with enhanced energy and demand monitoring.
- Rated measurement current of 1 A with maximum input current of 6 A.
- Suitable for 3-wire and 4-wire three-phase systems.
- Class C / Class 0.5 S active energy accuracy for high-accuracy metering.
- Class 2 reactive energy accuracy.
- Measures active and reactive energy in import and export directions.
- Integrated RS-485 communication supporting Modbus RTU and ABB EQ Bus.
- Supports four tariffs with internal clock-based tariff switching.
- Two digital inputs and two digital outputs provide flexible pulse and alarm functionality.
- Previous values, minimum and maximum demand, event logging and load profiling support detailed energy analysis.
- IEC approved and MID approved and verified for professional metering applications.
Key Features
- ABB A44 EQ meter series.
- Gold functionality level.
- Three-phase transformer-connected electricity meter.
- CT connection with support for 1 A and 5 A current-transformer secondary circuits.
- Rated measurement current: 1 A.
- Maximum measurement current: 6 A.
- 3 × 57.7/100–288/500 V AC rated system voltage range.
- 50/60 Hz operating frequency.
- Class C / Class 0.5 S active energy accuracy.
- Class 2 reactive energy accuracy.
- Active and reactive energy measurement.
- Separate import and export registers plus total energy measurement.
- Resettable register for intermediate energy values.
- Four energy tariffs.
- Internal real-time clock for tariff switching.
- Minimum and maximum demand measurement.
- Previous-value recording.
- Timestamped event logging.
- 8-channel load profile.
- RS-485 serial communication.
- Modbus RTU and ABB EQ Bus protocols.
- Infrared communication interface.
- 2 digital inputs and 2 digital outputs.
- Up to 25 configurable alarm conditions.
- Large backlit pixel-oriented digital display.
- Seven-module DIN-rail construction.
Advanced Transformer-Connected Three-Phase Energy Monitoring
The ABB A44 452-100 is designed for three-phase installations where primary load currents are measured indirectly through external current transformers. Its transformer-connected architecture supports high-current distribution systems while Class C / Class 0.5 S active energy accuracy provides precise measurement for demanding commercial and industrial energy-monitoring applications.
Gold-level functionality extends the meter beyond accumulated energy measurement with four tariffs, previous values, minimum and maximum demand, timestamped event logging and an 8-channel load profile. RS-485 communication via Modbus RTU or ABB EQ Bus allows meter information to be integrated into compatible building-management, industrial monitoring and energy-management systems, while two inputs and two outputs provide additional pulse and alarm flexibility.
Typical Applications
- Industrial three-phase energy monitoring.
- Commercial building electricity metering.
- CT-connected electrical sub-metering.
- Higher-current distribution boards and switchgear.
- Building management systems using Modbus RTU.
- RS-485 energy-management networks.
- Import and export energy measurement.
- Multi-tariff electricity monitoring.
- Demand and load-profile analysis.
- Factory and production-facility energy monitoring.
- Three-phase 3-wire and 4-wire distribution systems.
- Energy efficiency and electrical consumption analysis.
