Need Help? - Call: 0086-573-8369881/8369882 or email:


  • SDM72CT-M Three phase kWh/ W meter with pulse output, RS485 Modbus RTU, CT connection, resettable

    Measure kWh, W, VA, PF, Hz, V, A etc.

    Bi-directional measurement IMP& EXP

    Two pulse outputs

    RS485 Modbus RTU

    1/5A CT connection

    Accuracy better than Class 1/B

    • Description
    • Diagram
    • Manual Download
    The SDM72CT-M is a digital three phase four wire energy meter with a white back-lighted LCD screen for perfect
    reading. The unit measures and displays the characteristics of three phase four wires(3p4w) supply, including
    voltage, frequency, current, power, active energy, imported or exported. Energy is measured in terms of kWh. The
    requisite current input(s) are obtained via current transformers(CT).
    This meter can be configured to work with a wide range of CTs, giving the unit a wide range of 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)                                     100mA, 333mV, 5A CT input
    Max. Current (Imax)                                120% of Ib 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                           20 Imax. for 0.5s
    Pulse output rate                                    Configurable ( Pulse 1)
                                                                   1000imp/kWh (Pulse 2)
    Display                                                   LCD with backlit
    Max. Reading                                         9999999kWh
    Active energy                                         Class 1 IEC62053-21
                                                                    Class B EN50470-3

    Unit Characteristics

    The Unit can measure and display:
    *Line voltage of all phases
    *Line Currents of all phases
    *Power and power factor
    *Active energy imported and exported

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

    Current Transformer Primary Current

    The unit can be configured to operate with CT ratio between primary current and secondary current. The
    secondary CT has two options: 1A/5A

    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 two pulse outputs. Both pulse outputs are passive type.
    Pulse output 1 is configurable. The pulse output can be set with Modbus protocol:
    0.01 kWh / imp
    0.1 kWh / imp
    1 kWh /imp
    10 kWh / imp
    100 kWh /imp
    Pulse width: 200/100(default)/60ms can set with Modbus protocol.
    Pulse output 2 is non-configurable. It 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