M553-CTX MultIfunction Transducer with RS485 coms & relay output



The M553-CTX PowerCom is a complete single or three phase multifunction ac power transducer, providing RS485 Modbus communication and a pulsed output in a 55mm DIN enclosure.


The M553-CTX model can be used on single phase and three phase systems without modification. It has a universal power supply which is suitable for ac or dc auxiliary voltages.
The M553-CTX covers a wide range of voltage inputs and CT and VT ratios can be programmed.


PDFParameters Measured

  • Phase Voltage (V)
  • Line Voltage (V)
  • Phase Current (I)
  • Frequency (Hz)
  • Active Power per phase (W)
  • System Active Power (W)
  • Reactive Power per phase (VAr)
  • System Reactive Power (VAr)
  • Apparent Power per phase (VA)
  • System Apparent Power (VA)
  • Import Active Energy (kW.h)
  • Export Active Energy (kW.h)
  • Import Reactive Energy (kVAr.h)
  • Export Reactive Energy (kVAr.h)
  • Apparent Energy (kVA.h)
  • Ampere Energy (A.h)
  • Power Factor per phase (P.F.)
  • System Power Factor (P.F.)
  • Amp Demand (Ad)
  • Watt Demand (Wd)
  • V A Demand (VAd)
  • Maximum Amp Demand (Max Ad)
  • Maximum Watt Demand Import (Max Wd)
  • Maximum Watt Demand Export (Max Wd)
  • Maximum VA Demand (Max VAd)
  • Neutral Current
  • Hours Run (Voltage based)

Ordering Information

Information Required Example
Product Code M553-CTX
Nominal input current 1 or 5A AC
Option Pulsed Output*

* If two pulse output required the RS485 will be removed
– relay to be confiqured at factory


The M553-CTX uses the well established Modbus protocol.
This enables remote reading and programming of the M553-CTX using a host computer.
The RS485 network allows up to 32 units to be connected in parallel, enabling them to be used with PC, PLC, RTU, Data loggers and Scada programs.
The PowerCom’s communication port incorporates an auto-configure function which, when connected to an existing Modbus network, will automatically detect the network’s parameters.
A red LED is provided to indicate that auxiliary power is present, and that the unit is communicating correctly.


The following can be programmed via the RS485 port: CT and VT ratios, pulse duration, asign relay (kW.h or VAr.h).


MultiView set-up and monitoring software is available free of charge from our web-site: www.hobut.co.uk

Pulsed Output

An optional pulsed output can be ordered. This can be assigned to W.h Var.h (import or export) A.h or VA.h.
Alternatively, it can be configured to act as set-point indicator.

System Types

Single Phase
Single phase 3 wire
3 phase 3 wire balanced load
3 phase 4 wire balanced load
3 phase 3 wire unbalanced load
3 phase 4 wire unbalanced load

General Specification

Rated Un Direct connected voltages between 28 to 330V L-N.
48V to 570V L-L.
(280V L-N. Nominal)
Range Un
Rated In 1A or 5A nominal
Range In 2-120% via C.T.
De-rate Point 2% In
Overload 4xIn for 1 second
Burden 0.5VA per phase Volts & Amps
Frequency 45-65Hz
Specified @ 23°C 10%-Un 10%-In
Parameters unless stated Class 0.3% to IEC 688
Volts and Amps Class 0.25% to IEC 688
Frequency Class 0.1Hz to IEC 688
Power Factor Class 1.0% to IEC 688
Active & Reactive Energy 1% of reading to IEC 1036
Installation category III (480 VAC ph/ph)
Degree of pollution 2
Rated impulse withstand voltage IEC60947-1-V imp:4kV
Electrical security IEC 61010-1
Inputs + Aux to case 3kV rms 50Hz for 1 min
Inputs + Aux to RS485 3kV rms 50Hz for 1 min
Inputs + Aux to relay 1k5V rms 50Hz for 1 min
Immunity to :
Electrostatic discharges:
IEC 61000-4-2-Level III
Radiated radio-Hz fields: IEC 61000-4-3-Level III
Electrical fast transient/bursts: IEC 61000-4-4-Level III
Impulse waves: IEC 61000-4-5-Level III
Conducted disturbances: IEC 61000-4-6-Level III
Voltage dips & short interruptions: IEC 61000-4-11
Emissions to:
Conducted and radiated
CISPR11-Class A
100 to 440V AC 100 to 420V DC
45 to 65Hz Burden <10VA
Working Temperature 0 to +60 deg C
Storage Temperature -30 to +65 deg C
Temperature Coefficient 0.01% per deg C
Low voltage DC auxiliary 19-69V dc
Frequency 380-420Hz
DC measurement
• Voltage (V) • Power Demand
• Current (I) • Maximum Amp Demand (Max Ad)
• Power (W) • Maximum Power Demand (Max Wd)
• Energy (W.h) • Ampere Hours (A.h)
• Amp Demand • Hours Run
General IEC 688 BSEN60688
BS4889 IEC 359
Safety IEC 6101-1 2010
UL, C-UL, Pending

Dimensions (MM)

Connection Diagrams