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Multifunctional Power Instrument LED Display from China Suppliers and Factory for Electrical Monitoring

The multifunctional power instrument is expertly crafted for electrical monitoring in power distribution systems. This high-precision device measures essential electrical parameters, including three-phase voltage, three-phase current, active power, reactive power, frequency, power factor, and four-quadrant energy. Its long-lasting LED display provides clear insights into the system's measurement parameters and operational data. Equipped with an RS485 communication interface and compliant with the MODBUS_RTU communication protocol, this instrument ensures seamless connectivity. Additionally, it features four programmable keys on the panel, allowing users to easily switch and set instrument parameters with remarkable flexibility. As a leading provider from China, we pride ourselves on being reliable suppliers and manufacturers in the power instrumentation market
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    Product Details

    Product Overview

    ⚡

    Supports multiple extended function modules including four-channel analog output (0~20mA / 4~20mA), four-channel switching value input, and four-channel switching value output — enabling both remote signaling and remote control functions.

    🔌

    Directly replaces conventional power transmitters, measuring indicating instruments, electric energy measuring instruments, and related auxiliary units. Modular structural design allows users to select the most economical functional configuration for highly cost-effective deployment.

    🏭

    Widely used in energy management systems, supply and distribution network automation, district power control, and complete sets of switchgear. Features convenient installation, simple wiring, compact size, programmable input parameters, and compatibility with various PLC and industrial control computer communications.

    Technical Parameters

    Input & Energy Output

    Technical Parameters

    Index

    Input

    Network

    Three-phase three-wire, three-phase four-wire

    Voltage

    Rated value

    AC 0~500V

    Over load

    Consistent 1.2 times instantaneous, 2 times / 30s

    Consumption

    <0.5VA (each phase)

    Impedance

    >500kΩ

    Current

    Rated value

    AC 1A, 5A

    Over load

    Consistent: 1.2 times instantaneous, 2 times / 1s

    Impedance

    <2mΩ

    Frequency

    45–65Hz

    Output

    Electric Energy

    Output mode

    Two-channel open-collector, optical coupling pulse output

    Pulse constant

    Active: 3200 imp/kWh
    Reactive: 3200 imp/kvarh

    Start

    Under rated voltage, reference frequency and cosφ=1.0, when load current is 0.01In, it can start and measure electric energy continuously.

    Creep

    When applying 115% rated voltage with no current in the current circuit, the instrument shows no electric energy accumulation and no pulse output.
    Communication, Analog & Switching Output

    Technical Parameters

    Index

    Output

    Communication

    Output mode

    RS485

    Protocol

    MODBUS_RTU

    Baud rate

    1200, 2400, 4800, 9600

    Analog Quantity

    Channel quantity

    4 channels

    Output mode

    0–20mA, 4–20mA

    Load ability

    <400Ω

    Switching Value

    Channel quantity

    4 channels

    Output mode

    Normally open relay contact output

    Contact capability

    AC 240V / 2A

    Switching value input

    Four-channel dry contact input modes

    Display mode

    LED (RED)

    Measuring Accuracy

    Voltage, Current

    ±(0.5%FS + one digit)

    Active power, Reactive power

    ±(0.5%FS + one digit)

    Frequency

    ±0.1Hz

    Power factor

    ±0.01PF

    Active energy

    ±0.5% (for reference only, not for meterage)

    Reactive energy

    ±1.0% (for reference only, not for meterage)

    Source

    Scope

    AC 220V, 50/60Hz

    Consumption

    <5VA

    Safety

    Withstand Voltage

    Input and source

    >2kV 50Hz / 1min

    Input and output

    >1kV 50Hz / 1min

    Output and source

    >2kV 50Hz / 1min

    Insulating resistance

    Any two of input, output, source, casing >20MΩ

    Environment

    Temperature

    Operation: -10°C ~ 50°C

    Storage: -25°C ~ 70°C

    Humidity

    ≤85%RH, free of wet and corrosive gas

    Elevation

    ≤3000m
    Model Selection Table

    Function & Shape / Model

    Measure & Display

    Shape Code (Figure Inside □)

    Selected Additional Functions

    Phase Voltage V

    Line Voltage

    Current

    Frequency

    Power Factor

    Active Power

    Total Reactive Power

    Total Apparent Power

    Each Phase Power Factor

     

    Each Phase

    Apparent Power

    Active Energy

    Reactive Energy

    ⑨ 96×96

    ⑧ 80×80

    ⑦ 72×72

    Communication RS485

    4-ch Switch Outputs

    4-ch Switch Input

    4-ch Analog Output

    Harmonic

    SFS-□S3-3E

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    Frequently Asked Questions

    Q
    What network configurations does this power meter support?
    The instrument supports both three-phase three-wire and three-phase four-wire network configurations, making it suitable for a wide range of industrial and commercial power distribution systems.
    Q
    What communication protocol does the device use, and what baud rates are supported?
    The device uses RS485 communication with the MODBUS_RTU protocol. Supported baud rates include 1200, 2400, 4800, and 9600 bps, allowing seamless integration with various PLCs and industrial control computers.
    Q
    What types of output modules are available for this instrument?
    The instrument offers multiple output options: four-channel analog quantity output (0–20mA or 4–20mA), four-channel switching value output (normally open relay, AC 240V/2A), RS485 communication output, and two-channel open-collector pulse output for electric energy metering.
    Q
    What is the measuring accuracy for voltage, current, and power parameters?
    The instrument achieves ±(0.5%FS + one digit) accuracy for voltage, current, active power, and reactive power. Frequency accuracy is ±0.1Hz, and power factor accuracy is ±0.01PF. Active energy accuracy is ±0.5% and reactive energy is ±1.0% (both for reference only, not for legal meterage).
    Q
    What are the operating environment requirements for this power meter?
    The instrument operates within a temperature range of -10°C to 50°C, with a storage range of -25°C to 70°C. Humidity should not exceed 85%RH, and the installation altitude should be no more than 3000m. The environment should be free of wet and corrosive gases.
    Q
    Can this instrument replace conventional power transmitters and energy meters?
    Yes. Thanks to its modular design and comprehensive measurement capabilities, this instrument can directly replace conventional power transmitters, measuring indicating instruments, electric energy measuring instruments, and related auxiliary units. Users can configure the most economical functional setup based on actual application requirements.