Multifunction Meter + Rogowski Coil



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: 0‐500 0‐2000A or 0‐4000A. Example: Nominal current is 400 Amps, you would choose the 0‐500A 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 Un 28V – 330V L-N
48V – 570V L-L
(280V L-N nominal)
Overload 800V continuous
Burden 0.5VA
Cut-off Point 2% Un nominal
Rated In A1: 10 – 500A
A2: 40 – 2000A
A3: 80 – 4000A


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


Installation Category III (480 VAC ph/ph)
Degree of Pollution 2
Rated Impulse Withstand Voltage IEC 60947-1-V imp: 4kV
Meter Front Class II
Electrical Security IEC 61010-1
Inputs + Aux to Case 4 kV rms 50 Hz for 1 min
Inputs + Aux to RS485 3kV rms 50 Hz for 1 min
Inputs + Aux to Relay 1.5kV rms 50 Hz for 1 min
LV DC Aux to Inputs 1.5kV rms 50 Hz for 1 min

Electromagnetic compatibility

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
Conducted and Radiated Emissions CISPR11-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


POWorking Temperature -20 to +70°C
Storage Temperature -30 to +80°C
Relative Humidity 0 – 95% non condensing
Shock 30g in 2 planes


Standard DIN Case DIN 96×96
Panel Mount Via 4 Retaining Brackets
Panel Cut-out 92+0.8mm x 92+0.8mm
Material Black Polycarbonate
Terminals Current 6mm²
All others 2.5mm²
IP Rating Front IP52 / Nema 12
IP Rating Case IP30 / Nema 1
Weight 0.25kg / 0.66lb



Coil Connections

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

Ordering Information