Multifunction Meter + Rogowski Coil M850-LRC

Multifunction Meter + Rogowski Coil M850-LRC


The M850-LRC is a unique combination of a 3 phase digital universal metering system and Rogowski coils. It can be used on any voltage system with a wide range of inputs, and incorporates a universal AC or DC auxiliary power supply.

One unit covers the majority of applications and wiring systems without any modification required, making the M850-LRC ideal for stocking. The M850-LRC has a LCD display with user selectable options of Blue, Green, or White back-lighting.

The M850-LRC supports up to three Rogowski coils for measuring current. By combining the meter with one or more M240-RCM coils the M850 can measure current up to 4000A. To maintain accuracy and resolution, three ranges of the meter can be ordered: 10-500, 40-2000A or 80-4000A. Example: Nominal current is 400 Amps, you would choose the 10‐500A meter.

Using M240-RCM coils allows for extremely easy installation compared to conventional CTs, making them ideal for fitting in difficult to reach installations, or for retrofitting applications. Also, the wide current range offers a cheaper solution than standard current transformers for high primary currents.


An integrated RS485 port enables the M850 to communicate with up to 31 other meters or controllers using the popular Modbus RTU protocol. The protocol allows the M850 to be used with PC, PLC, RTU, Data loggers and Scada programs.


The unique 3 colour option LCD FSTN display is designed to be read in a variety of conditions over wide viewing angles and distances.

There are three colour options of the back lighting available: Blue, Green, or White; which are selectable through the front panel.


The M240-RCM is available in a variety of standard lengths to suit most installation scenarios. Special lengths are available on request. For more information please see the MultiCore brochure.

General Specification

Rated Un28V – 330V L-N
48V – 570V L-L
(280V L-N nominal)
Overload800V continuous
Cut-off Point2% Un nominal
Rated InA1: 10 – 500A
A2: 40 – 2000A
A3: 80 – 4000A


Input100 – 440V AC 45 – 65Hz
100 – 420V DC
19-69V DC (optional)
Burden< 10VA


Installation CategoryIII (480 VAC ph/ph)
Degree of Pollution2
Rated Impulse Withstand VoltageIEC 60947-1-V imp: 4kV
Meter FrontClass II
Electrical SecurityIEC 61010-1
Inputs + Aux to Case4 kV rms 50 Hz for 1 min
Inputs + Aux to RS4853kV rms 50 Hz for 1 min
Inputs + Aux to Relay1.5kV rms 50 Hz for 1 min
LV DC Aux to Inputs1.5kV rms 50 Hz for 1 min

Electromagnetic compatibility

Electrostatic DischargesIEC 61000-4-2-Level III
Radiated Radio-Hz FieldsIEC 61000-4-3-Level III
Electrical Fast Transient / BurstsIEC 61000-4-4-Level III
Impulse WavesIEC 61000-4-5-Level III
Conducted DisturbancesIEC 61000-4-6-Level III
Voltage Dips & Short InterruptionsIEC 61000-4-11
Conducted and Radiated EmissionsCISPR11-Class A


LCD Update time of 1 second, back-light colour of blue, green or white.

Standard Outputs

Integrated RS485 (Modbus std or BACnet) with baud rates of :76800, 57600, 38400, 19200, 9600, and 4800. Parity of Odd, Even, and no parity supported. Response time is <10mS.
An integrated pulsed output, solid-state relay module is included. It can be set for W.h or VAr.h.


  1. 19V-69V dc auxiliary (see ‘Insulation’)
  2. BACnet


Working Temperature-20 to +70°C
Storage Temperature-30 to +80°C
Relative Humidity0 – 95% non condensing
Shock30g in 2 planes


Standard DIN CaseDIN 96×96
Panel MountVia 4 Retaining Brackets
Panel Cut-out92+0.8mm x 92+0.8mm
MaterialBlack Polycarbonate
TerminalsCurrent 6mm²
All others 2.5mm²
IP Rating FrontIP52 / Nema 12
IP Rating CaseIP30 / Nema 1
Weight0.25kg / 0.66lb



Coil Connections

k = Red wire
l = Blue wire
s = Screen wire

Ordering Information

Call us now on: +44 1922 640003