2CMA170518R1000 ABB A42 552-120 Single-Phase CT/VT Energy Meter 16.7 Hz RS-485
ABB A42 552-120 is a Platinum single-phase CT/VT-connected DIN-rail energy meter with Class 0.5 S active energy accuracy, four-quadrant active and reactive measurement, 16.7/50/60 Hz operation and RS-485 Modbus RTU communication.
The ABB A42 552-120 is a high-performance single-phase CT/VT-connected electricity meter developed for accurate energy monitoring in railway, traction, industrial and infrastructure applications. As part of the ABB A42 EQ meter series, this Platinum-function meter is specifically designed to provide dependable transformer-connected measurement on 16.7 Hz networks while also supporting 50 and 60 Hz applications.
The A42 552-120 provides comprehensive four-quadrant active and reactive energy measurement, with import and export values stored in separate registers. Its transformer-connected measuring circuit accepts up to 6 A, while the 100–288 V AC voltage range provides flexibility across single-phase installations. Active energy is measured to Class 0.5 S accuracy and reactive energy to Class 2.
As a Platinum-level EQ meter, the A42 552-120 provides advanced functionality including four tariffs, previous values, maximum and minimum demand, advanced load profiles, harmonics and total harmonic distortion monitoring. Integrated RS-485 communication with Modbus RTU, four configurable inputs/outputs and an infrared interface allow comprehensive integration with energy-management and monitoring systems.
Key Advantages
Specialised single-phase CT/VT-connected energy meter for 16.7 Hz traction applications.
Also suitable for operation on 50 and 60 Hz networks.
Class 0.5 S active energy accuracy for high-precision transformer-connected metering.
Measures active and reactive energy in import and export directions.
Integrated RS-485 Modbus RTU communication for remote data acquisition.
Supports four tariffs with flexible tariff control.
Four configurable inputs/outputs for tariffs, pulses, signals and alarms.
Advanced monitoring includes demand values, load profiles, harmonics and THD.
Wide −40 to +70 °C operating temperature range supports demanding installations.
Compact four-module DIN-rail format simplifies installation in electrical panels.
Designed for 16.7 Hz traction-frequency applications.
Compatible with 16.7, 50 and 60 Hz electrical networks.
Maximum measurement current: 6 A.
100–288 V AC measurement voltage range.
Class 0.5 S active energy accuracy.
Class 2 reactive energy accuracy.
Four-quadrant active and reactive energy measurement.
Separate import and export energy registers.
Four energy tariffs with tariff control via inputs, communication or clock.
Previous-value recording and maximum/minimum demand functions.
Advanced load-profile functionality.
Harmonic and total harmonic distortion monitoring.
RS-485 serial communication with Modbus RTU.
Four configurable inputs/outputs.
Infrared communication interface.
Pixel-oriented display capable of showing multiple quantities simultaneously.
Low meter power consumption of less than 0.8 VA.
Reliable Energy Monitoring for Traction and Infrastructure Systems
The ABB A42 552-120 is designed for applications where accurate transformer-connected energy measurement is required at the 16.7 Hz frequency commonly associated with railway and traction infrastructure. Its four-quadrant measurement capability records both active and reactive energy in import and export directions, supporting detailed analysis of energy flow within demanding electrical systems.
Platinum functionality extends the meter beyond basic consumption measurement by providing instrumentation values, demand monitoring, advanced load profiles, harmonics and THD information. RS-485 Modbus RTU communication and four configurable inputs/outputs enable this information to be incorporated into centralised energy-management, supervisory and monitoring systems.
Typical Applications
16.7 Hz railway and traction electrical systems.
Railway infrastructure and peripheral equipment.
Single-phase CT/VT-connected energy monitoring.
Industrial electrical distribution systems.
50 and 60 Hz transformer-connected metering installations.
RS-485 Modbus energy-management networks.
Import and export energy monitoring.
Power-quality and harmonic monitoring.
Multi-tariff electricity measurement.
Advanced energy consumption and demand analysis.
Technical Specifications
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MID Approval
Yes
Device Type
Energy meter
Series
A42 EQ Meters
ABB order code
2CMA170518R1000
Product type
Single-phase electricity / energy meter
Functionality level
Platinum
Connection type
CT/VT transformer connected
Number of phases
1
Maximum measurement current
6 A
Voltage range
100–288 V AC
Operating frequencies
16.7 / 50 / 60 Hz
Measured energy
Active and reactive energy
Energy direction
Import and export / four quadrant
Active energy accuracy
Class 0.5 S
Reactive energy accuracy
Class 2
Tariffs
4
Communication interface
RS-485
Communication protocol
Modbus RTU
Additional interface
Infrared
Configurable inputs/outputs
4
External I/O supply range
5–240 V AC/DC
Advanced monitoring
Previous values, maximum/minimum demand, load profiles, harmonics and THD
Instrumentation
Active power, reactive power, apparent power, current, voltage, power factor and frequency
Power consumption
Less than 0.8 VA
Operating temperature
−40 to +70 °C
Display
Pixel-oriented digital display
Mounting type
DIN rail
Module width
4 DIN modules
Weight
approx. 0.20 kg
MID status
MID approved and verified when used at 50 Hz
Frequently Asked Questions
What is the ABB A42 552-120 used for?
The ABB A42 552-120 is a single-phase CT/VT-connected energy meter designed particularly for reliable energy measurement in 16.7 Hz railway and traction applications, while also supporting 50 and 60 Hz networks.
What energy measurements does the A42 552-120 provide?
The meter provides four-quadrant active and reactive energy measurement, recording import and export energy in separate registers.
What is the accuracy of the ABB A42 552-120?
The A42 552-120 provides Class 0.5 S accuracy for active energy and Class 2 accuracy for reactive energy.
What communication does the ABB A42 552-120 support?
The meter incorporates RS-485 serial communication with Modbus RTU for remote meter reading and integration into compatible monitoring and energy-management systems.
What advanced monitoring functions does the A42 552-120 provide?
Its Platinum functionality includes four tariffs, previous values, maximum and minimum demand, advanced load profiles, harmonics and THD monitoring, together with extensive electrical instrumentation values.
Trusted Energy Measurement from ABB
ABB A42 Platinum energy meters provide high-accuracy transformer-connected measurement, advanced instrumentation and flexible communications for traction, infrastructure and industrial applications where detailed energy and power-quality information is required.
MID Approval
Yes
Device Type
Energy meter
Series
A42 EQ Meters
ABB order code
2CMA170518R1000
Product type
Single-phase electricity / energy meter
Functionality level
Platinum
Connection type
CT/VT transformer connected
Number of phases
1
Maximum measurement current
6 A
Voltage range
100–288 V AC
Operating frequencies
16.7 / 50 / 60 Hz
Measured energy
Active and reactive energy
Energy direction
Import and export / four quadrant
Active energy accuracy
Class 0.5 S
Reactive energy accuracy
Class 2
Tariffs
4
Communication interface
RS-485
Communication protocol
Modbus RTU
Additional interface
Infrared
Configurable inputs/outputs
4
External I/O supply range
5–240 V AC/DC
Advanced monitoring
Previous values, maximum/minimum demand, load profiles, harmonics and THD
Instrumentation
Active power, reactive power, apparent power, current, voltage, power factor and frequency
Power consumption
Less than 0.8 VA
Operating temperature
−40 to +70 °C
Display
Pixel-oriented digital display
Mounting type
DIN rail
Module width
4 DIN modules
Weight
approx. 0.20 kg
MID status
MID approved and verified when used at 50 Hz
No documents available for this product.
UK delivery
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This productManufacturer Lead Time
Estimated Delivery 6 weeks
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