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Learn more by watching our Major Tech MT574 | Diagnostic Insulation Tester 5kV | Metal Case video.
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.
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.
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All products come with a manufacturer’s or supplier’s warranty
Damaged or Faulty Goods
If your order arrives damaged or is faulty, let us know within 24 hours.
Contact us via our chat to arrange the return.
Exclusions
We can’t accept returns for:
How to Request a Return
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.
To initiate a warranty claim:
Return to Sparky Direct
Ship the meter back to Sparky Direct along with:
Please ensure the unit is securely packaged to prevent damage in transit.
Forwarded for Assessment
Upon receiving your meter, we will forward it to Major Tech’s authorised service centre for inspection, testing, and calibration.
Major Tech’s service lab will assess the returned unit to determine:
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.
| 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 |
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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.
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