KLEFR 694x

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KLEFR 694x

Three phase CT connected energy meter

The KLEFR 694x is a high quality three phase CT connected meter designed for applications like photovoltaic systems (PV), electric vehicle chargers (EV)  and building management systems (BMS). Due to its compact size (4 DIN Module) and easy installation, integration and configuration, the meter will fit in every PV, EV and BMS application that requires (MID) metering.KLEFR three phase CT meter

There are three types of KLEFR 641x meters:

  • KLEFR 6941 – Standard
  • KLEFR 6943 – M-bus
  • KLEFR 6944 – Modbus

MID approved

All KLEFR meters comply with the Measuring Instruments Directive 2014/32/EU. The MID approval ensures the accuracy and quality of the meter and enables its use in billing purposes. The KLEFR 694x is measuring active energy with accuracy class B (=1) and reactive energy with accuracy class 2.  The certificates and other meter specifications can be found in the 694x user manual.


Data from the KLEFR meters can be collected and programmed via the M-bus, Modbus or Infrared interface. The KLEFR 6943 meter has a built in M-bus interface for communication. The KLEFR 6944 can communicate and be programmed via the Modbus RTU (RS-485) interface. All KLEFR meters are equipped with an Infrared interface (for reading and programming) and a selectable pulse output. More information like the Modbus register map, M-bus specifications and infrared user manual can be found in the 694x user manual. The free PC software for infrared communication is available here.

Display pages

Navigation through the display pages of the KLEFR 694x can easily be done by using the arrow shaped buttons on the front of the meter. Information like the meter serial number, current direction, various settings and the following values can be displayed on the LCD:

Active valuesReactive valuesInstantaneous values
Active energy
(total and per phase)
Reactive energy
(total and per phase)
(per phase)
T1 active energyT1 reactive energyCurrent
(per phase)
T2 active energyT2 reactive energyActive power
(total and per phase)
Forward active energy
(total and per phase)
Forward reactive energy
(total and per phase)
Reactive power
(total and per phase)
T1 forward active energyT1 forward reactive energyApparent power
(total and per phase)
T2 forward active energyT2 forward reactive energyCOS phi
(total and per phase)
Reverse active energy
(total and per phase)
Reverse reactive energy
(total and per phase)
T1 reverse active energyT1 reverse reactive energy
T2 reverse active energyT2 reverse reactive energy


Settings can be done manually and with a Modbus, M-bus or Infrared command. The settings can be checked in program mode 1 and changed in program mode 2 or 3. The settings in program mode 3 are password protected.

  • Modbus/M-bus ID can be set to a value from 1 to 247 (Modbus) and 1 to 250 (M-bus).
  • Baud rate can be set to 1200, 2400, 4800 or 9600.
  • Modbus parity can be set to even, none or odd.
  • CT ratio has to be programmed before use.
  • Automatic scroll function can be customized by adding and deleting display pages.
  • LCD cycle time can be set to a scroll time from 1 to 30 seconds.
  • Backlight mode can be set to ON, OFF or Button mode.
  • S0 output can be set to 10.000/2.000/1.000/100/10/1/0,1/0,01 imp/kWh.
  • Calculation mode of the total active energy can be set to 01=forward only, 04=reverse only,
    xxx05=forward+reverse, 06=reverse-forward, 09=forward-reverse, 10=forward-reverse and
  • Power down counter can be reset to 0.
  • Password can be changed in program mode 3.


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