Inquiry Now
Leave Your Message
Products Categories
Featured Products
SFM118 Series Single Phase Multifunction Meter

SFM118 Series Single Phase Multifunct...
SFM472 Series Three Phase Multifunction Meter

SFM472 Series Three Phase Multifuncti...
Three Phase Digital Combined Meter

Three Phase Digital Combined Meter
Multifunctional watch LED

Multifunctional watch LED
Three Phase Digital Voltmeter, Ammeter

Three Phase Digital Voltmeter, Ammeter
SFN-9K6-3UI Digital Combined Meter

SFN-9K6-3UI Digital Combined Meter
Single Phase Multifunctional Power Instrument

Single Phase Multifunctional Power In...
Single Phase Digital Combined Meter

Single Phase Digital Combined Meter
Power factor meter

Power factor meter
Single-phase meter

Single-phase meter
0102030405
Three Phase Digital Voltmeter,Ammeter supplier .jpg
Three Phase Digital Voltmeter,Ammeter producer.jpg
Three Phase Digital Voltmeter,Ammeter distributor .jpg
Three Phase Digital Voltmeter,Ammeter .jpg

Three-Phase Digital Voltmeter & Ammeter from China Suppliers | High-Precision Monitoring for Industrial Applications

,

Enhanced Technical Specification: Three-Phase Digital Voltmeter & Ammeter

,

Discover our advanced series of three-phase digital voltmeters and ammeters, meticulously designed for optimal precision in monitoring voltage and current in three-phase AC power systems. Ideal for China’s industrial distribution cabinets, control panels, and substation monitoring, these devices offer the flexibility of direct low-voltage/low-current measurement as well as high-range measurements using auxiliary transformers. As a leading supplier and factory in the industry, we ensure our products meet the diverse needs of electrical systems across various applications.

,
    Contact us Download
    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 Direct Measurement Range: 0 ~ 600 V AC

    This range supports direct connection to three-phase low-voltage systems (e.g., 380 V, 400 V, 440 V, 600 V) without external signal conditioning equipment. It is ideal for on-site monitoring of motor control centers, distribution panels, and light industrial load systems.

    Extended Extended Measurement Range (With Accessory Voltage Transformer - PT): 0 ~ 9999 kV AC

    For high-voltage (HV) and extra-high voltage (EHV) system monitoring, the voltmeter is paired with a voltage transformer (PT) calibrated to a standard secondary output of 100 V AC. The primary voltage range (0 ~ 9999 kV) is determined by the PT ratio (e.g., 110 kV/100 V, 500 kV/100 V), enabling safe and accurate measurement of transmission lines, substations, and high-voltage equipment. The PT provides electrical isolation between the high-voltage primary circuit and the voltmeter, ensuring operator safety and device protection.

    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 Direct Measurement Range: 0 ~ 10 A AC

    This range 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 Extended Measurement Range (With Accessory Current Transformer - CT): 0 ~ 9999 A AC

    For high-current system monitoring, the ammeter is integrated with a current transformer (CT) rated for a standard secondary output of 5 A AC. The primary current range (0 ~ 9999 A) is defined by the CT ratio (e.g., 100 A/5 A, 500 A/5 A, 1000 A/5 A), making it suitable for measuring large industrial loads, generator output currents, and distribution feeder currents. The CT isolates the ammeter from high primary currents, preventing overload damage and ensuring measurement precision.

    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 ● √ +

    ● = Standard Function  |  √ = Available Shape  |  + = Optional Add-on

    Frequently Asked Questions (FAQ)

    Q1 What is the difference between the direct measurement range and the extended measurement range on 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 measurement of high-voltage and extra-high voltage systems while providing electrical isolation for operator safety.
    Q2 Does the Three-Phase Digital Ammeter require a current transformer (CT) for all applications?
    No. For low-current applications (0–10 A AC), the ammeter can be connected directly to the circuit without a CT, simplifying installation. A current transformer is only required when measuring high currents (up to 9999 A AC), where the CT steps down the primary current to a standard 5 A AC secondary output compatible with the ammeter input.
    Q3 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 particularly important in industrial environments where non-linear loads such as variable frequency drives (VFDs) and rectifiers distort the waveform. Unlike average-responding meters, True RMS meters provide accurate readings even under these distorted conditions.
    Q4 What communication and output options are available for the SFN series models?
    The SFN series offers three selectable additional functions: RS485 communication interface (for SCADA/BMS integration), 2-channel switch (relay) output (for alarm or control triggering), and 1-channel analog output (for 4–20 mA or 0–10 V signal transmission to PLCs or data acquisition systems). These options are available for both the current (3I) and voltage (3U) measurement variants.
    Q5 What panel cutout sizes are supported for installation?
    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). Not all sizes are available for every model — please refer to the Technical Parameters table to confirm which shape codes are supported for your selected model.
    Q6 What does the overload indication function on the ammeter do?
    The overload indication function monitors the measured current in real time and alerts the user when abnormal or excessive current conditions are detected in the three-phase system. This helps prevent equipment damage, enables prompt corrective action, and improves overall system safety and reliability in industrial and commercial power distribution applications.