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  • SDM72D-M Three phase kWh/ W meter with pulse output, RS485Modbus RTU, Bi-directional measurement, Resettable

    • Measures active energy & power
    • Bi-directional measurement IMP& EXP
    • Resettable partial energy
    • Pulse output
    • RS485 Modbus RTU
    • Max.100A direct connection
    • 2P3W, 3P4W
    • Accuracy better then class 1/B

    • Description
    • Diagram
    • Manual Download


    The SDM72D-M is a digital three phase four wire energy meter, it is equipped with a white back-lighted LCD screen for perfect reading. The unit measures and displays active energy (kWh) and power ( W), imported and exported. A resettable partial energy is available, so the user can easily check the energy imported and energy exported during a certain period. 

    The SDM72D-M supports Max.100A direct connection, which saves the cost and avoid the trouble to connect external CTs, giving the unit a cost-effective and easy operation. Built-in interfaces provides pulse and RS485 Modbus RTU outputs. Configuration is password protected.

    General Specifications

    Voltage AC (Un)                                     3x230(400)V
    Voltage Range                                       80~120% Un
    Base Current (Ib)                                   10A AC
    Max. Current (Imax)                              100A AC
    Mini Current (Imin)                                5% of Ib AC
    Starting current                                      0.4% of Ib
    Power consumption                               <2W/10VA
    Frequency                                              50/60Hz
    AC voltage withstand                             4KV for 1 minute
    Impulse voltage withstand                     6KV-1.2uS wavform
    Overcurrent withstand                           30max 0I for 0.01s
    Pulse output rate                                   1000imp/kWh (Pulse 2)
    Display                                                   LCD with backlit
    Max. Reading                                        999999.9kWh
    Active energy                                        Class 1 IEC62053-21
                                                                  Class B EN50470-3

    Unit Characteristics

    The Unit can measure and display:

    * Power

    * Active energy imported and exported

    Pulse output indicates real-time energy measurement. An RS485 output allows remote monitoring from another display or a computer.

    RS485 Serial – Modbus RTU

    This unit uses an RS485 serial port with Modbus RTU protocol to provide a means of remotely monitoring and controlling the Unit
    Set-up screens are provided for setting up the RS485 port.

    Pulse output

    The unit provides pulse output for active kWh. The Pulse output is passive type.

    The pulse out is fixed up with total kWh. The constant is 1000imp/kWh.

    RS485 Output for Modbus RTU

    For Modbus RTU, the following RS485 communication parameters can be configured from the Set-up menu:
    Baud rate 1200,2400, 4800, 9600
    Parity none (default)/odd/even
    Stop bits 1 or 2
    RS485 network address nnn – 3-digit number, 001 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.


    Operating temperature                               -25℃ to +55℃
    Storage and transportation temperature    -40℃ to +70℃
    Reference temperature                               23℃± 2℃
    Relative humidity                                        0 to 95%, non-condensing
    Altitude                                                       up to 3000m
    Warm up time                                            10s
    Installation category                                   CAT III
    Mechanical Environment                            M1
    Electromagnetic environment                     E2
    Degree of pollution                                     2


    Din rail dimensions                                 72x100x66 (WxHxD) DIN 43880
    Mounting                                               DIN rail 35mm
    Sealing                                                   IP51 (indoor)
    Material                                                 self-extinguishing UL94V-0