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Three-Phase Digital Voltmeter & Ammeter - High Precision Measurement from Reliable China Suppliers & Factory

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Enhanced Technical Specification: Three-Phase Digital Voltmeter & Ammeter from Leading China Suppliers

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This advanced series of three-phase digital voltmeters and ammeters is designed for high-precision, real-time monitoring of voltage and current parameters within three-phase AC power systems. Ideal for use in industrial distribution cabinets, control panels, and substation monitoring applications, these devices are perfect for those seeking reliable solutions from reputable China suppliers. They support both direct low-voltage/low-current measurements and extended high-range measurements through auxiliary transformers, guaranteeing versatility and functionality across various electrical systems. Choose our products for high-quality performance directly from the factory.

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    Product Details

    Product Overview

    1 Three-Phase Digital Voltmeter
    1.1 Measuring Range

    The voltmeter offers two measurement configurations to accommodate low, medium, and ultra-high voltage three-phase systems:

    Direct Measurement Range
    0 ~ 600 V AC

    Supports direct connection to three-phase low-voltage systems (e.g., 380 V, 400 V, 440 V, 600 V) without external signal conditioning equipment. Ideal for motor control centers, distribution panels, and light industrial load systems.

    Extended Range (With PT)
    0 ~ 9999 kV AC

    For HV and EHV system monitoring, paired with a voltage transformer (PT) calibrated to a standard secondary output of 100 V AC. Enables safe measurement of transmission lines, substations, and high-voltage equipment. The PT provides electrical isolation ensuring operator safety.

    1.2 Core Measurement Features
    • Real-time monitoring of line-to-line (UAB, UBC, UCA) and line-to-neutral (UA, UB, UC) voltages in three-phase systems.
    • True RMS measurement algorithm, ensuring accuracy even with distorted waveforms caused by non-linear loads (e.g., variable frequency drives, rectifiers).
    • Digital display with clear, high-visibility readings for quick on-site verification.
    2 Three-Phase Digital Ammeter
    2.1 Measuring Range

    The ammeter is designed with flexible current measurement capabilities, supporting both direct low-current measurement and extended high-current monitoring via current transformers:

    Direct Measurement Range
    0 ~ 10 A AC

    Allows direct connection to three-phase circuits with low current loads (e.g., small motors, lighting systems, control circuits), eliminating the need for external CTs and simplifying installation.

    Extended Range (With CT)
    0 ~ 9999 A AC

    Integrated with a current transformer (CT) rated for a standard secondary output of 5 A AC. The primary current range is defined by the CT ratio (e.g., 100 A/5 A, 500 A/5 A, 1000 A/5 A). Suitable for large industrial loads, generator output currents, and distribution feeder currents.

    2.2 Core Measurement Features
    • Accurate RMS current measurement for each of the three phases (IA, IB, IC), with optional display of total system current.
    • Compatibility with standard CT ratios, enabling easy calibration and configuration for specific applications.
    • Overload indication function to alert users of abnormal current conditions in the monitored system.

    Technical Parameters

    Function & Shape
    Model    		 Measure & Display Shape Code (Figure Inside) Selected Additional Functions
    Three Phase
    Current    		 Three Phase
    Voltage    		 ⑨
    96×96     		⑧
    80×80     		⑦
    72×72     		④
    48×48     		Communication
    Interface: RS485    		 2-Channel
    Switch Output    		 1-Channel
    Analog Output
    SFS-□K3-3I ● √
    SFS-□K3-3U ● √
    SFN-□K3-3I √ √ √ √
    SFN-□K3-3U ● √ √ √ √
    SFN-□K3-3I+RS ● √ √ √ +
    SFN-□K3-3U+RS ● √ √ √ +
    SFN-□K3-3I+2DO ● √ +
    SFN-□K3-3U+2DO ● √ +
    SFN-□K3-3I+1AO ● √ +
    SFN-□K3-3U+1AO ● √ +

    Frequently Asked Questions

    Q What is the difference between direct measurement and extended measurement range for the three-phase digital voltmeter?
    The direct measurement range (0–600 V AC) allows the voltmeter to connect directly to low-voltage three-phase systems without any additional equipment. The extended measurement range (0–9999 kV AC) requires an external voltage transformer (PT) with a standard 100 V AC secondary output, enabling safe monitoring of high-voltage and extra-high voltage systems such as transmission lines and substations.
    Q Why is a Current Transformer (CT) needed for the three-phase digital ammeter in high-current applications?
    For currents exceeding the direct measurement range of 0–10 A AC, a current transformer (CT) is required. The CT steps down the primary current to a standard 5 A AC secondary output, isolating the ammeter from dangerous high currents, preventing overload damage, and enabling accurate measurement of large industrial loads up to 9999 A.
    Q What does True RMS measurement mean and why is it important?
    True RMS (Root Mean Square) measurement calculates the actual effective value of an AC signal, regardless of its waveform shape. This is especially important in systems with non-linear loads such as variable frequency drives and rectifiers, which generate distorted waveforms. True RMS ensures accurate readings even when the waveform deviates from a pure sine wave.
    Q Which models support RS485 communication interface?
    The models SFN-□K3-3I+RS and SFN-□K3-3U+RS are equipped with an RS485 communication interface. This allows integration with SCADA systems, PLCs, and building management systems for remote monitoring and data logging of three-phase current and voltage measurements.
    Q What panel cutout sizes are available for these meters?
    The meters are available in four standard DIN panel sizes: 96×96 mm (code ⑨), 80×80 mm (code ⑧), 72×72 mm (code ⑦), and 48×48 mm (code ④). Availability varies by model — SFS series models only support the 96×96 mm size, while SFN series models support multiple size options depending on the configuration.
    Q What additional output options are available and what are they used for?
    Three optional output functions are available: RS485 communication interface for digital data transmission, 2-channel switch output (2DO) for alarm relay control or threshold-based switching, and 1-channel analog output (1AO) for transmitting a 4–20 mA or 0–10 V signal proportional to the measured value to external control systems or data acquisition devices.