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        Learn more by watching our Major Tech MT574 | Diagnostic Insulation Tester 5kV | Metal Case video.

        Major Tech | 5kV Diagnostic Insulation Tester 10TΩ | 100V to 5kV in 50V Steps

        The Major Tech MT574 is a 5kV diagnostic insulation tester with six preset test voltage ranges of 100V, 250V, 500V, 1000V, 2500V, and 5000V, adjustable in 50V increments. It measures insulation resistance up to 10TΩ on the 5000V range, with a short circuit current output up to 6mA and a CAT III 300V rating to IEC 61010-1. The MT574 also measures up to 750V AC, 1000V DC, and capacitance to 50µF, and stores 500 results for recall or transfer to a PC over optical USB. A microprocessor-controlled backlit display shows the insulation reading, elapsed measuring time, output voltage, and output current in a metal field case.

        Diagnosing insulation on rotating machines and transformers takes more than a pass or fail number at a single voltage. Step testing across a range of stress levels shows where leakage begins, and a fixed 1kV or 5kV output cannot resolve that picture. The MT574 selects six ranges from 100V to 5000V, adjustable in 50V increments, so the test voltage matches the winding rating rather than the nearest preset. Auto-ranging then follows the measurement across 500GΩ at 100V through to 10TΩ at 5000V.

        For HV maintenance contractors, the diagnostic value sits in the ratios: DAR and PI indication builds moisture and ageing evidence into every timed run of 1 to 30 minutes. An alarm flags readings above or below a set threshold, auto hold freezes the result, and 500 recordings transfer to a PC over optical USB with the supplied software. The instrument runs on 12.6V rechargeable lithium batteries with a charger in the kit, so a day of testing runs without carrying spare primary cells. Auto discharge then drains the circuit under test after each measurement before the leads come off.

        Features

        • Six test voltage ranges — button selection sets 100V, 250V, 500V, 1000V, 2500V, or 5000V, with output adjustable in 50V increments.
        • Insulation resistance to 10TΩ — ceilings run 500GΩ at 100V, 1000GΩ at 250V, 2000GΩ at 500V, 5000GΩ at 1000V, 1TΩ at 2500V, and 10TΩ at 5000V, all at ±(3% + 5 digits).
        • CAT III 300V rated — the MT574 carries an IEC 61010-1 CAT III 300V safety rating; confirm the category suits the connection point.
        • 6mA short circuit current — output current is sized for rotating machines, transformers, cables, high voltage generators, electric circuits, and surge arresters.
        • DAR and PI indication — dielectric absorption ratio and polarisation index results support diagnostic testing beyond a spot reading.
        • Adjustable test time — timed tests run from 1 minute to 30 minutes, with auto hold freezing the reading at completion.
        • 500-recording memory — the MT574 saves 500 results for recall on the display or transfer to a PC via optical USB and the supplied software.
        • Measured-value alarm — an alarm sounds when the reading rises above or falls below the alarm setting value.
        • 750V AC and 1000V DC measurement — voltage functions read from 0.1V at ±(1.5% + 3 digits), alongside capacitance from 10nF to 50µF.
        • Leakage current display — DC current measures 0.01nA to 6mA, with current measurement resolved from 0.1nA to 50µA depending on insulation resistance.
        • Auto discharge — the MT574 discharges the circuit under test automatically after each measurement completes.
        • Metal field case — a backlit LCD, Line, Guard, and Earth terminals, auto power off, and 12.6V rechargeable lithium batteries with charger equip it for extended site work.

        Where to use

        • Rotating machine diagnostics — the MT574 step-tests motor and generator windings at voltages matched to their insulation rating.
        • Transformer condition assessment — DAR and PI ratios build the moisture and contamination picture behind maintenance decisions.
        • HV cable testing — feeder and submain insulation proves out at up to 5000V with measuring reach to 10TΩ.
        • Surge arrester checks — leakage current display from 0.1nA resolves the small currents arrester testing depends on.
        • Commissioning electric circuits — the MT574 verifies new industrial wiring at selectable test voltages before energisation.
        • Periodic plant surveys — 500 stored recordings carry a full round of scheduled tests back to the office for PC download.

        The MT574 applies test voltages up to 5000V DC and is a tool for trained personnel following safe isolation procedures; confirm the circuit is de-energised and discharged before connection. Its safety rating is CAT III 300V, so verify the measurement category and voltage of the connection point before testing near supply. The instrument stores 500 recordings; transfer data to a PC over the optical USB link to keep records beyond that capacity.

        (MT574)

        Six preset ranges select at the buttons: 100V, 250V, 500V, 1000V, 2500V, and 5000V, with the output adjustable in 50V increments on each range. Auto-ranging runs on every insulation range, with maximum readings from 500 gigohms at 100V up to 10 teraohms at 5000V.

        Alongside spot insulation readings, it indicates dielectric absorption ratio and polarisation index, runs timed tests from 1 to 30 minutes, and displays leakage current from 0.1nA. Those ratios and trends reveal moisture and ageing in windings that a single resistance figure cannot.

        Yes. Up to 500 recordings save in memory and recall onto the backlit display. Stored data transfers to a PC through the optical USB connection using the software supplied in the kit, which also includes the USB and data line.

        It measures AC voltage to 750V and DC voltage to 1000V from a 0.1V floor, both at ±(1.5% + 3 digits), plus capacitance from 10nF to 50µF and DC current from 0.01nA to 6mA.

        An alarm setting value can be entered, and the tester alerts when the measured value is larger or smaller than that threshold. It suits repeat testing against a pass level, alongside auto hold, which freezes readings, and auto power off.

        The kit includes the tester, carry case, carry straps, test leads, test rod, USB, data line, and charger. Power comes from 12.6V rechargeable lithium batteries, recharged from the supplied charger rather than replaceable dry cells.

        The MT574 carries a 2 year warranty for both domestic and commercial use, starting from the invoice date. Lodge a claim by returning the unit to Sparky Direct with proof of purchase and a fault description; it is then forwarded to Major Tech's authorised service centre for assessment. Allow 7 to 14 working days.

        The Major Tech MT574 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.

        100-Day Fuss-Free Returns
        We want you to love what you buy—but if you change your mind, that’s okay too. That’s why Sparky Direct offers a 100-day money-back guarantee.

        • Items must be unused, with all parts, accessories, and original packaging.
        • We can’t accept returns if the product is damaged, incomplete, or not in resalable condition.
        • Proof of purchase is required.
        • Return shipping is the responsibility of the customer. 

        If your item isn’t in its original condition, please contact us before returning it—we might save you time and money.


        All products come with a manufacturer’s or supplier’s warranty

        • Warranty starts from the Invoice Date
        • Some suppliers offer in-home warranties and handle claims directly, so you won’t need to uninstall or return the product. Chat with us to check if your product qualifies.
        • Sparky Direct isn’t responsible for losses caused by product failure.
        • Warranties are void if products aren’t installed by a licensed electrician.

        Damaged or Faulty Goods
        If your order arrives damaged or is faulty, let us know within 24 hours.

        • Sparky Direct will pay for return shipping via an emailed return label.
        • If the fault is confirmed, we will send you a replacement item or provide a refund.

        Contact us via our chat to arrange the return.


        Exclusions
        We can’t accept returns for:

        • Items that have been installed, modified, or used
        • Clearance, End of life, Discontinued, or special order items (unless faulty)
        • All PPE Items
        • Goods returned without original packaging or proof of purchase

        How to Request a Return

        1. Contact our customer service team with your order number.
        2. Confirm it’s eligible under our return or warranty policy.
        3. Pack the item securely and return it using a trackable service.
        4. Once we receive and inspect it, we’ll process your refund or replacement.

        Warranty starts from Invoice Date

        Domestic Use: 2 Year
        Commercial Use: 2 Year
        Warranty Method: Return to Sparky Direct

        All Major Tech Meters sold through Sparky Direct are covered by the manufacturer’s warranty. If you believe your meter is faulty or defective, you may request an assessment under this warranty policy.

        How to Lodge a Warranty Claim

        To initiate a warranty claim:

        1. Return to Sparky Direct
          Ship the meter back to Sparky Direct along with:

          • A copy of your proof of purchase
          • A brief description of the issue
          • Your contact details

          Please ensure the unit is securely packaged to prevent damage in transit.

        2. Forwarded for Assessment
          Upon receiving your meter, we will forward it to Major Tech’s authorised service centre for inspection, testing, and calibration.

        Assessment Process

        Major Tech’s service lab will assess the returned unit to determine:

        • Whether the fault is due to a manufacturer’s defect (covered under warranty), or
        • If the issue is the result of user error or no fault is found.

        Outcomes

        • If approved under warranty: The product will be repaired or replaced at no cost to you.
        • If not covered under warranty: The lab may offer repair services, which will be quoted and billed directly to you by the service provider.

        Important Notes

        As Major Tech’s service labs are independent providers, Sparky Direct cannot govern or guarantee turnaround times or any costs incurred for repairs outside of warranty coverage.

        Please allow up to 7-14 working days for the return of your product.

        Specification Range Accuracy
        Insulation 100V - 500GΩ
        250V - 1000GΩ
        500V - 2000GΩ
        1000V - 5000GΩ
        2500V - 1TΩ
        5kV - 10TΩ
        ±(3.0% +5)
        ±(3.0% +5)
        ±(3.0% +5)
        ±(3.0% +5)
        ±(3.0% +5)
        ±(3.0% +5)
        AC Voltage 0.1V – 750V ±(1.5% +3)
        DC Voltage 0.1V – 1000V ±(1.5% +3)
        DC Current 0.01nA – 6mA ±(5% +2)
        Capacitance 10nF – 50µF ±(10% +5)
        Short Circuit Current 6mA
        Current Measurement 0.1nA to 50µA (Depending on insulation resistance)
        Batteries 12.6V Rechargeable Lithium Batteries
        Dimensions 240 x 188 x 85mm
        Weight 2.75kg

        These specifications and characteristics outline physical, mechanical, electrical details.

        Brand Major Tech
        SKU MT574
        Model # MT574
        Barcode # 6008229041242
        Package Weight 10.930kg
        TYPE VALUE
        Type Diagnostic Insulation Tester
        Brand Major Tech
        Height (mm) 240
        Width (mm) 188
        Depth (mm) 85
        Power Source 12.6V Rechargeable Lithium Batteries
        DC Voltage 0.1V – 1000V
        AC Voltage 0.1V – 750V
        Insulation 100V - 5kV
        Included Carry Case, Carry Straps, Tester, Test Leads, High Pressure Rod, USB, Data Line, Charger
        Insulation Resistance 500GΩ - 10TΩ

        Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.

        Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.

        Tools sold by Sparky Direct must be used safely and in accordance with the manufacturer’s instructions. Customers are responsible for ensuring they have the necessary knowledge and competence to operate any tool purchased. If you are unsure how to safely or correctly use a tool, do not use it and seek guidance from the manufacturer or a suitably qualified professional.

        Nothing in this clause limits or excludes any rights or guarantees available under the Australian Consumer Law.

        For website terms and conditions https://www.sparkydirect.com.au/terms-of-use

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