Insulation Testers

Insulation testers, also known as megohmmeters or electrical insulation tester meggers, are essential electrical test tools used for preventive or predictive maintenance programmes. These devices are designed to identify potential equipment failures before they occur. Insulation resistance testers are perfect for testing a wide range of high voltage equipment including switchgear, motors, generators and cables.

RS offers a range of high-quality electrical insulation testers from leading brands including Megger, Fluke, Chauvin Arnoux, and of course RS PRO.

We also offer an in-house calibration service. See here for more details: calibration services.

Insulation Tester Types

Insulation testers come in various configurations to cater to different testing needs and safety requirements. Some key factors to consider when choosing an insulation tester include:

• Safety Category: Insulation testers are categorised into different safety categories (CAT I, CAT II, CAT III, CAT IV) based on the level of transient overvoltage they can withstand. Choose a tester with a safety category rating appropriate for your working environment.
• Voltage Range: Insulation testers offer different voltage ranges, typically from 500V to 10kV. Select a tester with a voltage range suitable for the equipment you'll be testing.
• Insulation Resistance Range: Insulation testers measure insulation resistance in Gigaohms (GΩ). Choose a tester with an appropriate resistance range for your application.
• AC/DC Measurement: Some insulation testers can measure both AC and DC insulation resistance, providing greater versatility in testing different types of equipment.
• Features: Consider additional features such as data logging, Bluetooth connectivity, and built-in safety features when choosing an insulation tester.

Insulation testers are handheld devices but can be portable with a handle or bench mounted. Most modern insulation testers feature an LCD or digital display, while some have the more traditional analogue needle such as the Megger MIT310A.

How Do Insulation Resistance Testers Work?

Insulation resistance testers assess the integrity of electrical insulation by measuring its resistance to current flow. The tester applies a high voltage, low current DC charge to the insulation and measures the resulting current flow.

• A high resistance reading indicates that very little current is leaking through the insulation, suggesting good insulation integrity.
• Conversely, a low resistance reading indicates a significant current leakage, which may signify insulation degradation or a potential fault.

What Is the Purpose of Insulation Testing?

Ideally, all the electrical current sent along a conductive wire should reach its intended destination. However, you do find that some of it is lost along the way due to various reasons. Wires are insulated with a resistant sheathing to contain the conductivity of the copper or aluminium core, but even with this insulation in place, some of the current still manages to escape. The electricity that leaks out can be detrimental to electrical circuits and machinery.

Testing can help you determine whether the insulation is performing at an effective and safe level. Excessive heat or cold, moisture, vibration, dirt, oil and corrosive vapours can all contribute to deterioration therefore routine testing can identify problems before they result in injury or equipment failure.

Insulation testers provide noise-free, reliable results. They are safe and easy to use and the ideal solution for troubleshooting, commissioning and preventative maintenance applications.

How Do I Choose an Insulation Tester?

When selecting an insulation tester, consider factors like voltage range, resistance measurement capabilities, accuracy, durability, and safety features. Assess your specific testing needs, such as the type of insulation materials and expected conditions. Make sure to also compare specifications and user reviews to ensure the chosen tester meets your requirements reliably and efficiently.

Insulation Tester vs Megohmmeter

An insulation tester is a general term for devices that measure insulation resistance, covering a range of applications and resistance values. A megohmmeter, on the other hand, is a specific type of insulation tester designed to measure very high resistance levels, typically in megohms, making it ideal for assessing the quality of insulation in larger systems like transformers, high-voltage motors, and critical cables.

While both tools apply high voltage to measure resistance, insulation testers are better suited for routine maintenance and quick checks in everyday electrical circuits. In contrast, megohmmeters are preferred for thorough testing, especially where high-voltage levels are needed to uncover hidden insulation weaknesses.

Selecting between the two depends on the application and the required measurement range. Always choose a device with the right voltage rating and safety category, and follow strict safety practices to mitigate electrical hazards during testing.

What Is a Good Insulation Test Result?

A good insulation test result typically shows high resistance values, indicating that the insulation material effectively prevents current leakage. The exact acceptable resistance level varies depending on factors like the type of equipment and industry standards. Generally, higher resistance values suggest better insulation integrity, ensuring equipment safety and reliability.

Industrial Applications of Insulation Testers

Insulation testers, or megohmmeters, play a crucial role in industrial settings, serving various applications to ensure electrical system reliability and safety. They are essential for machinery maintenance, assessing insulation in motors and generators to prevent breakdowns.

Additionally, they are utilised for testing electrical systems, quality control in manufacturing, safety inspections, and preventive maintenance. Brands like Fluke and Megger offer tailored solutions, providing accurate and reliable testing for critical electrical systems.

Digital Insulation Resistance Tester Price

The prices of digital insulation resistance testers, such as ac insulation testers, typically range from MYR2,808 to MYR48,798, with features such as measurement range, accuracy, and additional functionalities influencing the cost across various models and brands.

How to Order Insulation Testers from RS Malaysia?

RS Malaysia is your go-to source for premium digital insulation testers. We carry top brands to offer the best solutions for all your electrical testing needs. Our user-friendly online platform provides a diverse catalogue of insulation testers, from handheld and benchtop models to multifunction testers. Whether you need a power cable insulation tester or a wire insulation tester, each listing includes detailed specifications and compatibility information to help you make informed decisions.

Here's how to order insulation testers from RS Malaysia:

• Browse our insulation testers: Start by browsing our comprehensive range of insulation testers that cater to various industrial and commercial requirements.
• Select Your Products: Add the desired products to your cart. Our detailed product descriptions and specifications will help you choose the right tester for your needs.
• Login or Create an Account: If you’re an existing customer, simply log in to streamline the checkout process. New users can also quickly create an account to enjoy benefits like order tracking and faster checkouts in the future.
• Checkout: Enter your shipping details, select your preferred delivery options, and choose from our secure payment methods.
• Order Confirmation: After placing your order, you’ll receive a comprehensive email with your purchase details and an estimated delivery timeframe.

With RS Malaysia, you can expect prompt and secure delivery, minimising disruptions to your operations. Trust us to provide efficient and reliable testing solutions, ensuring your projects stay on track.