Smarter, Safer, Stronger: Megger’s New Insulation Testing Line-Up

Monday 11th August 2025

When precision, reliability, and rugged performance matter, Megger delivers. The new range of 5, 10, and 15 kV insulation testers has been engineered to meet the demanding needs of professionals working in power distribution, utilities, industrial maintenance, and high-voltage environments.

Whether you’re conducting routine maintenance or performing complex diagnostics, these testers offer a flexible, future-ready solution, combining intuitive operation, advanced safety features, and the trusted accuracy Megger is known for. With three clearly defined categories — Essential, Advanced, and Expert, there’s a perfect match for every application, from fast ‘go/no-go’ checks to in-depth, data-rich insulation analysis.

Built for the real world, designed with the user in mind, this new Megger series sets a new benchmark for insulation testing.

Built for Real-World Challenges

Megger’s updated range of insulation testers continues the brand’s reputation for rugged dependability, accurate results, and long service life. These are not just laboratory-grade instruments—they’re field-ready, tested in extreme conditions, and optimised for performance where it matters most.

Across all categories, users benefit from:

Intuitive custom colour displays for readability in all environments
Dual power operation (battery and AC mains)
Rapid charge Li-ion batteries
Dual-case design for added durability and protection
Up to CAT IV 1000 V / 3000 m safety rating
Exceptional noise immunity (up to 8 mA, model dependent)

Every model has been developed with a focus on user simplicity, speed, and accuracy. Whether testing high-capacitance cables, navigating noisy environments, or working remotely, this range ensures consistent, traceable results.

Choose the Right Tool for the Job

One of the standout aspects of this range is its tiered product structure, offering solutions tailored to different usage needs and technical requirements. The three categories—Essential, Advanced, and Expert, are structured to scale with your testing complexity.

✅ ESSENTIAL SERIES

Models:

MIT515/2 (5 kV)
MIT1015 (10 kV)

The Essential range is ideal for straightforward insulation testing at lower voltages. It’s built for ‘go/no-go’ testing, where there’s no requirement to store or transfer results. These models shine in tough environments where portability and durability are key, and where testing needs remain under 10 kV.

No data storage or transfer capabilities
3 mA default test current
Simplified operation with minimal setup
Lightweight with robust outer casing
Perfect for quick checks in the field

These are the workhorses of the range; reliable, efficient, and ready to perform wherever you are.

⚙️ ADVANCED SERIES

Models:

MIT525/2 (5 kV)
MIT1025/2 (10 kV)
MIT1525/2 (15 kV)

A step up from the Essential models, the Advanced range is designed for users who need more control, diagnostics, and connectivity. These instruments include:

Full data storage and USB/Bluetooth transfer
PI predictor (PIp) for faster insulation analysis
RE>Act mode for reabsorption current monitoring
Ramp, DAR, and DD tests
Selectable output current
Software compatibility with CertSuite Asset and PowerDB Lite
Increased noise immunity (up to 6 mA)

These models are ideal for diagnosing insulation faults in power networks, substations, and industrial systems.

🏆 EXPERT SERIES

Models:

S1-568/2 (5 kV)
S1-1068/2 (10 kV)
S1-1568/2 (15 kV)

At the top of the range sits the Expert series. Designed for critical infrastructure, remote operation, and extreme environments, these models include all the features of the Advanced series—plus enhanced capability.

Full control of output current
Remote operation via USB
Noise immunity up to 8 mA
Humidity and temperature logging
Support for switchyards up to 765 kV
Enhanced data integration with PowerDB Pro

If your application involves high-risk environments or needs complete test control, this is your go-to.

Feature Deep Dive: RE>Act Test Mode

A standout innovation across the Advanced and Expert models is RE>Act Mode—a revolutionary function that enhances the reliability of insulation resistance testing.

In traditional testing, reabsorption current (residual charge in insulation) can result in falsely high or low IR measurements. This can lead to incorrect pass/fail outcomes and inconsistent reporting.

RE>Act Mode helps eliminate this risk by:

Measuring and monitoring the reabsorption current
Alerting the user if the reading may be impacted
Providing guidance on test validity

The result? Greater test confidence, fewer retests, and more accurate data for reporting and maintenance planning.

Smarter Testing with PI Predictor (PIp)

Also new to the Advanced and Expert models is PI Predictor (PIp)—a feature designed to cut down test time without compromising result quality.

Traditional PI testing can take up to 10 minutes to complete. PIp accelerates this by using the first part of the test to predict the final result, often concluding in just 3 to 5 minutes.

Predicts final PI value early
Stops test when confidence threshold is met
Saves time in high-volume testing environments

This patented feature is especially useful for field engineers under time pressure or with multiple assets to test in a single shift.

Here’s how the key specifications compare across the range:

Capability	Essential	Advanced	Expert
Max Test Voltage	5 or 10 kV	5 / 10 / 15 kV	5 / 10 / 15 kV
Data Logging	No	Yes	Yes
Bluetooth/USB Transfer	No	Yes	Yes
Remote Operation	No	No	Yes (USB)
PIp Function	No	Yes	Yes
RE>Act Mode	No	Yes	Yes
PDC Test	No	Yes	Yes
Noise Rejection	3 mA	6 mA	8 mA
Output Current Selection	No	Yes	Full Control
Onboard Time Stamping	No	Yes	Yes
Humidity & Temp Logging	No	No	Yes
Software Integration	Limited	CertSuite + PowerDB Lite	Full PowerDB Advance/Pro
Display	Colour Display	Colour Display	Colour Display
Carry-All Lid Pouch	Yes	Yes + Deeper Lid	Yes + Deeper Lid

Designed with the User in Mind

No matter the model, all testers benefit from:

Consistent dual rotary control layout
Simple user navigation
Backlit colour display for clarity in bright or low light
Quick start guides printed inside the lid
Carry-all case and pouch for accessories

The user interface has been designed with speed, clarity, and ease of training in mind—perfect for both new and experienced professionals.

Communication & Software Support

Connectivity is a priority across the Advanced and Expert series. Engineers can easily:

Transfer test results via USB or Bluetooth
Stream data live for real-time analysis
Integrate results into asset management systems like CertSuite
Use PowerDB Lite or Pro for full asset lifecycle reporting

Whether you’re performing a one-off test or managing hundreds of assets across multiple sites, these testers simplify record-keeping and reporting.

🛡️ Safety Without Compromise

Megger’s insulation testers don’t just deliver performance—they prioritise operator safety at every level.

Built-In Safety Standards

5 kV and 10 kV models: CAT IV 600 V up to 3000 m altitude
15 kV MIT1525/2: CAT IV 1000 V up to 4000 m altitude

The dual case design across the range adds protection against impacts, drops, and environmental exposure. A flame-retardant inner case helps prevent moisture ingress and provides thermal insulation.

Voltage Warnings

The testers issue clear, progressive alerts before, during, and after use:

Level 1: Live voltage above 30 V detected
Level 2: 75% of voltage limit exceeded
Level 3: 100% of limit reached
Level 4: External voltage on discharge-resistant connections
Level 5: Warning of high internal voltages—do not touch the instrument

Combined, these features give peace of mind when working in high-voltage, high-risk environments.

✳️ Enhanced RE>Act Safety Feature

Beyond improving measurement accuracy, the RE>Act mode also introduces two essential safety functions:

Prevents false passes by ensuring absorption currents are fully accounted for.
Monitors post-test discharge, helping users avoid dangerous return voltages after a test is complete.

Ease of Use Meets Deep Diagnostic Power

Despite the technical depth of these testers, Megger has prioritised usability:

Five pre-set voltage ranges in insulation test mode
User-selectable lock voltage range
Quick-access test modes like:
- IR, PI, DAR
- DD (Dielectric Discharge)
- PDC (Polarisation Depolarisation Current)
- Step Voltage
- Ramp

These diagnostic tools are preconfigured and ready to go on all Advanced and Expert models.

Data Storage & CertSuite Compatibility

For users needing to manage test data, Megger provides multiple options for storing, sharing, and analysing results.

✔ CertSuite Asset Lite

Free with MIT units, this software allows:

On-site tagging of test results to asset IDs
Simple transfer of test data via USB or Bluetooth
Real-time uploads via mobile app or PC

✔ CertSuite Asset Full

A subscription-based solution offering:

Advanced storage, comments, and photo documentation
Team access from multiple locations
Remote management by engineers or head office

✔ PowerDB Compatibility

For advanced asset managers, PowerDB Pro and PowerDB Advance provide complete test result integration with CMMS systems and reporting tools.

Test Leads & Connectors

Each tester is supplied with double-insulated test leads:

Medium clip: 3 kV / 6 kV rated
Large clip: 5 kV / 10 kV rated
15 kV set: Insulated to 15 kV

All test leads feature non-detachable clips and 4 mm IV insulated plugs that lock into the instrument for added safety.

✅ Final Thoughts

Megger’s latest range of 5, 10, and 15 kV insulation resistance testers represents a major leap forward in:

Measurement accuracy
User productivity
Operator safety
Data integration
Field reliability

From the streamlined user interface to the innovative RE>Act and PI predictor modes, every detail has been carefully considered for professionals working at the highest level of electrical testing.

Whether you’re after simplicity with the Essential range, expanded diagnostics in the Advanced line, or full-featured capability in the Expert tier—this new series delivers performance you can trust.

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Smarter, Safer, Stronger: Megger’s New Insulation Testing Line-Up