MRJ385 EASYWIRE "Plug & Play" Multi Function Energy Meter With Integrated Pulse OutPut & RS485/Modbus RTU


Rayleigh Instruments


Save Time, Save Money!

A concept that is unique and dramatically reduces the wiring/installation times of multifunction power meters and current transformers.

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Measured Parameters:
Voltage, Current, Power Factor, Active Power, Reactive Power, Apparent Power, Active Power Maximum Demand, Maximum Apparent Power Demand, Power Factor.


  • Single and 3 phase 4 wire network , balanced or unbalanced load operation
  • Integrated Built in single pulsed output and RS485 Modbus/RTU
  • Active energy class 1 (EN62053-21)
  • Reactive energy class 2 (EN62053-23)
  • 330mV current transformer input


Designed for ease of installation on a split load board. Rayleigh Instruments has introduced a novel method of wiring and installing power meters and current transformers. The new 'EasyWire' system substantially reduces the time it takes to wire and install three phase current transformers and multifunction energy meters, thanks to a design that allows plug-in connections to be used for both current and voltage input/output. 

These savings are made possible due to the innovative design of both the current transformers and the meters, which allow plug in connectors to be used for both current and voltage input/output. An RJ45 lead is used for connecting between the three phase current transformer and meter, and 'readymade' plug in leads are used for the voltage input.

Daisy-chain up to 32 Meters!... Power up to 32 Energy Meters from a single power source.

Power-up your meter... Plug the ready-made ‘supply’ lead connector into your meter. Connect the other, ferrule tipped, ends to the supply, not forgetting to use the correct fuses, and you’re done.

Connect your current transformer ...... Plug one end of the RJ45 lead into the multifunction power meter and the other end into the three-phase current transformer and you’re done - it’s that simple.

More than one meter?... Plug the ready-made ‘linking’ lead connector from your first meter to your second

This system is safer than using traditional current transformers because Easywire transformers incorporate the resistive shunts usually located within the power meter. This means that the secondaries are always loaded, therefore eliminating the possibility of dangerously high voltages developing during open circuit conditions.

This allows the meter to current transformer to be disconnected without the need for secondary shorting terminals, again saving money and reducing downtime.

The MRJ385 - Easywire meter is designed for quick connection using a single lead to connect to a three phase current transformer. The MRJ385 - Easywire meter is also designed so that the MRJ385 meter has a daisy-chain voltage connection that means only a single volt reference (1 per phase) needs to be use for a group of meters.

Requires Three Phase Current Transformer.

Dimensions: H=96mm, W=96mm, D=53mm

WIRING INPUT 3.Ø - 4 wire, 1.Ø - 2 wire
RATED INPUT VOLTAGE 100 TO 240Vac (L-N); 173-415Vac (L-L)
CT PRIMARY 5A to 10000A (Programmable for any value)
PT PRIMARY 100 to 500KVac (Programmable for any value)
PT SECONDARY 100 to 500Vac (Programmable for any value)
DISPLAY UPDATE TIME 1 Second for parameters
DISPLAY SCROLLING Automatic / Manual
AUXILIARY Self supplied
Operating : 0 to 50°C
Storage : -20 to 75°C
HUMIDITY 85% non-condensing
MOUNTING Panel mounting, front panel to IP65
WEIGHT 230gms
Pulsed Output : Voltage range External 24VDC max
Current capacity : 100mA

European Patent Number 2663871- EasyWire Technology
UK Patent Number GB2487555 - EasyWire Technology
Hong Kong Patent Number HK1174434 - EasyWire Technology

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