New

Advanced 5 kV, 10 kV and 15 kV insulation resistance testers

MIT525/2, MIT1025/2, MIT1525/2

Perform advanced insulation testing with PI Predictor™, RE>Act™ test mode, onboard storage, and easy result export to PowerDB or CertSuite.

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Diagnostic testing with full test suite

Run IR, DAR, PI, DD, SV, ramp, and PDC tests for deeper insight into insulation condition and long-term asset health.

PI Predictor™ cuts test time in half

PI Predictor™ estimates PI values in minutes, improving productivity with no loss in accuracy. Ideal for multiple asset tests.

Accurate testing with RE>Act™

RE>Act™ shows when insulation is ready to retest, avoiding errors from residual reabsorption current. Save time between tests, and safely monitor discharge to avoid dangerous return voltages

Built-in storage and easy data export

Internal memory and compatibility with PowerDB or CertSuite help eliminate manual recording and simplify reporting.

Designed for safe testing in the field

CAT IV safety, live circuit detection, and locking terminals help protect the operator in real-world industrial settings.

Full Product Details

About the product

The Megger Advanced range of 5 kV, 10 kV, and 15 kV insulation resistance testers is ideal for engineers and technicians performing insulation testing on transformers, motors, switchgear, and cables in environments up to 230 kV. These instruments support IR, DAR, PI, DD, SV, ramp, and PDC (with software), providing the diagnostic depth needed for condition assessment and maintenance planning.

Each model includes PI Predictor™ to speed up testing, internal memory for storing results, and optional Bluetooth® for exporting data to PowerDB or CertSuite — no manual recording required.

The new innovative patent applied RE>Act test mode allows the user to make accurate measurements by monitoring reabsorption current. This groundbreaking test mode can ensure reabsorption current does not result in incorrectly passing or failing insulation, helping to maintain safety. In addition, the test mode can be used to ensure dangerous return voltages to not occur.

Choose from three models — MIT525/2, MIT1025/2, and MIT1525/2 — based on your required test voltage. With 6 mA noise immunity and high-performance guard terminals, the Advanced range delivers reliable results where remote control and substation-level noise handling are not required.

To explore additional options, see our full range of insulation testers.

Product documents

Data sheet

ADVANCED_MIT525-2--MIT1025-2--MIT1525-2_DS_en.pdf

pdf 1.02 MB

User guide

MIT515-2--MIT1015--MIT525-2--MIT1025-2--MIT1525-2-UG_en.pdf

pdf 10.56 MB

Application note

ReAct_AN_en.pdf

pdf 3.24 MB

Application note

PDC_AN_en.pdf

pdf 4.09 MB

Application note

PI-Predictor-AN-EN.pdf

pdf 145.26 KB

Application note

S1 application_AN_en.pdf

pdf 12.59 MB

Software and firmware updates

Windows communications driver

This is the communications driver required for the instrument to transfer data to a Windows computer.

latest version

Windows communications driver

latest version

2.12.36.20

Megger device USB drivers (Windows 10 & 11) Download Instructions

1. Download the Megger device USB drivers file from the relevant website product page.

2. Copy the above file to a folder of your choice. This makes the files easy to locate for the rest of the installation.

3. Unzip/Extract the USB drivers file.

4. Connect the instrument to your computer using the USB cable supplied.

5. If communication is not possible check the driver is correctly installed in the Ports section of Device Manager (right-click Start/Device Manager).

6. If the USB driver is not installed correctly it will be shown with a yellow “!” and needs updating to change the location.

7. Right click on the driver and select ‘Update driver’.

8. Select ‘Browse my computer’ for drivers.

9, Navigate to the location that the driver was extracted to.

10. Check the driver is now in the Ports section of Device Manager.

11, If it is still not correct repeat from section 8 above.

Note in Ports (COM & LPT) the Megger Device now has a COM number and warning symbol has disappeared.

zip 4.19 MB

FAQ / Frequently Asked Questions

Which insulation tester is right for me?

Megger offers three insulation tester ranges: Essential, Advanced, and Expert.

Choose Essential for go/no-go testing where storage isn’t needed — ideal for basic maintenance.

Choose Advanced if you need deeper diagnostics and onboard storage, but not remote control.

Choose Expert if you work in noisy substation environments or need full remote testing.

Once you’ve selected the right level, simply choose the test voltage (5, 10, or 15 kV) for your application.

Can I export results for reporting?

Yes. The Advanced range features built-in memory and USB connectivity as standard, plus optional Bluetooth®. Test results can be exported directly to PowerDB or CertSuite to support documentation, compliance, and long-term record keeping.

What diagnostic tests does the Advanced range support?

All Advanced models support a full suite of diagnostic test modes, including IR, DAR, PI, DD, step voltage, ramp, and PDC (with software). These tests are essential for in-depth insulation condition assessment on critical assets like transformers, cables, motors, and switchgear.

Is the Advanced range suitable for noisy environments?

Yes — the Advanced models offer 6 mA of noise immunity, making them suitable for environments up to 230 kV. This ensures stable, reliable results in moderately noisy conditions, such as industrial plants or distribution-level substations. For extreme electrical noise or testing above 230 kV, the Expert range is recommended.

How can i get technical support on this product ?

Information about Service / Repair / Calibration and Technical Support are available here