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SDM630MCT-2L Dual Load multifunction 3phase RJ connection din rail energy meter

• Dual 3 Ph 4 Wire Loads

• Measures kWh, kVarh, kW, kVar, KVA, P,

• F, PF, Hz, dmd, V, A,THD, etc.

• Bi-directional measurement IMP & EXP

• CT / PT is programmable

• RS485 Port for Modbus 

• Din rail mounting 35mm

• RJ12 Plug-in CT connection

• Relay Output

• 9 V dc Output
  • Description
  • Diagram
  • Manual Download


SDM630MCT Dual Load measures and displays the characteristics of two three phase four wires circuits, including voltage, frequency, current, power and active and reactive energy, imported or exported. Energy is measured in terms of kWh, kVArh. Maximum demand current can be measured over preset periods of up to 60minutes. In order to measure energy, the unit requires voltage and current inputs in addition to the supply required to power the product. The requisite current input(s) are obtained via current transformers (CT).

This meter has two RJ12 sockets for fast connecting with current transformer CTs with 0.333V output. This meter also provides 1 digital output ( solid state) with capability to command most of the circuit breaker coils directly. This meter offers power 9V dc from RJ12 port for external device working.

Unit Characteristics

The Unit can measure and display:

   L-N voltage and THD% (total harmonic distortion) of all phases

   Line Frequency

  Currents, Current demands and current THD% of all phases

  Power, maximum power demand and power factor

  Active energy imported and exported

  Reactive energy imported and exported

The unit has password-protected set-up screens for:

  Changing password

  Supply system selection 1phase 2 wire, 3phase 4wires

  CT1 value

  PT ratio (1 to 9999)

  Demand Interval time

  Reset for demand measurements

Measured Parameters

The unit can monitor and display the following parameters of a 1- phase 2 wire, 3-phase 4-wire supply.

 Voltage and Current

Phase to neutral voltages 100 to 289V a.c.

Voltages between phases 173 to 500V a.c.

Percentage total voltage harmonic distortion (THD%) for each phase to N

Current THD% for each phase

 Power factor and Frequency and Max. Demand

Frequency in Hz

Instantaneous power:

   Power 0 to 3600 MW

   Reactive Power 0 to 3600 MVAr

   Volt-amps 0 to 3600 MVA

Maximum demanded power since last Demand reset Power factor

Maximum neutral demand current, since the last Demand reset

 Energy Measurements

  Imported active energy       0 to 9999999.9 kWh

  Exported active energy       0 to 9999999.9 kWh

  Imported reactive energy    0 to 9999999.9 kVArh

  Exported reactive energy    0 to 9999999.9 kVArh

  Total active energy            0 to 9999999.9 kWh

  Total reactive energy         0 to 9999999.9 kVArh

 Measured Inputs

Voltage inputs through 4-way fixed connector with 2·5mm2 stranded wire capacity. Line frequency measured from L1 voltage or L3 voltage.

Three current inputs with stranded RJ12 socket for connection of external CTs. Nominal rated input current is 0.333V.


  Voltage                               0·5% of range maximum

  Current                               0·5% of nominal

  Frequency                           0·2% of mid-frequency

  Power factor                        1% of unity (0.01)

  Active power (W)                  ±1% of range maximum

  Reactive power (VAr)            ±1% of range maximum

  Active energy (Wh)              Class 1 IEC 62053-21

  Reactive energy (VARh)        ±1% of range maximum

  Total harmonic distortion      1% up to 31st harmonic

 Power Supply

Two-way fixed connector with 2·5mm2 stranded wire capacity.

The meter is powered from Phase L1. The user must make sure the meter Phase 1 has power on.

 Interfaces for External Monitoring

Three interfaces are provided: an RS485 communication channel that can be programmed for Modbus RTU protocol.

RS485 Output for Modbus RTU

For Modbus RTU, the following RS485 communication parameters can be configured from the Set-up menu:

Baud rate2400, 4800, 9600, 19200, 38400

Parity none/odd/even

Stop bits1 or 2

RS485 network addres snnn– 3-digit number, 00 1 to 247

Modbus™ Word order Hi/Lo byte order is set automatically to normal or reverse. It cannot be configured from the set-up menu.

 Reference Conditions of Influence Quantities

Influence Quantities are variables that affect measurement errors to a minor degree. Accuracy is verified under nominal value (within the specified tolerance) of these conditions.

 Ambient temperature           23°C ±1°C

 Input waveform                  50 or 60Hz ±2%

 Input waveform                  Sinusoidal (distortion factor < 0·005)

 Magnetic field of external origin   Terrestrial flux


  Operating temperature         -25°C to +55°C*

  Storage temperature           -40°C to +70°C*

  Relative humidity                0 to 90%, non-condensing

  Altitude                             Up to 3000m

  Warm up time                   1 minute

  Vibration                          10Hz to 50Hz, IEC 60068-2-6, 2g

  Shock                              30g in 3 planes