2CMA170540R1000 ABB A44 452-100 Three-Phase CT-Connected Gold Energy Meter with Modbus RS-485
ABB A44 452-100 is a Gold three-phase transformer-connected DIN-rail energy meter with 1 A rated and 6 A maximum measurement current, Class C / Class 0.5 S active energy accuracy, four-tariff monitoring, an 8-channel load profile and RS-485 Modbus RTU or EQ Bus communication.
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.
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.
Technical Specifications
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MID Approval
Yes
Device Type
Energy meter
Measurement Connection Type
Via CT (/5 A)
Series
A44 EQ Meters
ABB order code
2CMA170540R1000
EAN
7392696705400
Product type
Three-phase electricity / energy meter
Functionality level
Gold
Connection type
Transformer connected
Number of phases
3
Network configuration
3-wire / 4-wire
Rated measurement current
1 A
Maximum measurement current
6 A
CT secondary compatibility
1 A / 5 A
Phase-to-neutral rated voltage
57.7–288 V AC
Phase-to-phase rated voltage
100–500 V AC
System voltage
3 × 57.7/100–288/500 V AC
Voltage measurement range
3 × 47–331 V AC
Frequency
50/60 Hz
Measured energy
Active and reactive energy
Energy direction
Import and export
Active energy accuracy
Class C / Class 0.5 S
Reactive energy accuracy
Class 2
Tariffs
4
Communication interface
RS-485
Communication protocols
Modbus RTU / EQ Bus
Additional interface
Infrared
Digital inputs
2
Digital outputs
2
Alarm capability
Up to 25 configurable alarms
Load profile
8 channels
Real-time clock
Integrated
Display
Backlit pixel-oriented digital display
Protection rating
IP20
Operating temperature
−40 to +70 °C
Power consumption
approx. 0.801 W
Mounting type
DIN rail
Module width
7 DIN modules
Dimensions (W × H × D)
123 × 97 × 65 mm
Net weight
approx. 0.363 kg
Standards
IEC 62052-11, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3
Approvals
IEC approved, MID approved and verified
Frequently Asked Questions
What is the ABB A44 452-100 used for?
The ABB A44 452-100 is used for three-phase transformer-connected energy monitoring in commercial and industrial electrical systems, including active and reactive energy measurement in both import and export directions.
What measurement current does the ABB A44 452-100 support?
The A44 452-100 has a rated measurement current of 1 A, supports 1 A and 5 A CT secondary circuits and has a maximum measurement current of 6 A.
What is the accuracy of the ABB A44 452-100?
The meter provides Class C / Class 0.5 S accuracy for active energy and Class 2 accuracy for reactive energy, supporting high-accuracy transformer-connected metering.
What communication does the ABB A44 452-100 support?
The A44 452-100 includes RS-485 communication supporting Modbus RTU and ABB EQ Bus, together with an infrared interface for compatible communication accessories.
What advanced monitoring functions does the A44 452-100 provide?
Its Gold functionality includes four tariffs, minimum and maximum demand, previous values, timestamped event logging and an 8-channel load profile, together with instrumentation values and up to 25 configurable alarms.
Trusted Energy Measurement from ABB
ABB A44 Gold energy meters combine high-accuracy transformer-connected three-phase measurement with demand monitoring, load profiling, multi-tariff functionality and digital communications, providing comprehensive energy data for modern commercial and industrial installations.
MID Approval
Yes
Device Type
Energy meter
Measurement Connection Type
Via CT (/5 A)
Series
A44 EQ Meters
ABB order code
2CMA170540R1000
EAN
7392696705400
Product type
Three-phase electricity / energy meter
Functionality level
Gold
Connection type
Transformer connected
Number of phases
3
Network configuration
3-wire / 4-wire
Rated measurement current
1 A
Maximum measurement current
6 A
CT secondary compatibility
1 A / 5 A
Phase-to-neutral rated voltage
57.7–288 V AC
Phase-to-phase rated voltage
100–500 V AC
System voltage
3 × 57.7/100–288/500 V AC
Voltage measurement range
3 × 47–331 V AC
Frequency
50/60 Hz
Measured energy
Active and reactive energy
Energy direction
Import and export
Active energy accuracy
Class C / Class 0.5 S
Reactive energy accuracy
Class 2
Tariffs
4
Communication interface
RS-485
Communication protocols
Modbus RTU / EQ Bus
Additional interface
Infrared
Digital inputs
2
Digital outputs
2
Alarm capability
Up to 25 configurable alarms
Load profile
8 channels
Real-time clock
Integrated
Display
Backlit pixel-oriented digital display
Protection rating
IP20
Operating temperature
−40 to +70 °C
Power consumption
approx. 0.801 W
Mounting type
DIN rail
Module width
7 DIN modules
Dimensions (W × H × D)
123 × 97 × 65 mm
Net weight
approx. 0.363 kg
Standards
IEC 62052-11, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3
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