Loop and RCD Testing Equipment 

Quickly verify disconnection times, fault loop impedance, and RCD operation with Megger’s trusted testers. Built for reliability, speed, and accuracy, our loop and RCD instruments support safe installations and smooth certification workflows every time.

Megger’s loop and RCD testers are built to help electricians verify disconnection times, earth fault paths, and system safety with confidence. Designed for speed, accuracy, and compliance, our instruments cover a wide range of test scenarios—from low current no-trip loop tests to type A, AC, and B RCD testing.

Clear displays, rugged designs, and simple interfaces ensure easy operation in domestic, commercial, and industrial settings. Whether you’re installing new circuits or carrying out routine maintenance, Megger tools help you stay efficient, minimise retests, and deliver reliable, regulation-compliant results every time.

Get a quote

All Electricians testers and tools Ground testing Electricians' accessories Loop and RCD testing Multifunction installation testers Multimeters and clampmeters Portable appliance testing solutions (PATs) Thermal cameras Time domain reflectometers

DCM305E

Earth leakage clampmeter

MPCC230 Circuit Checker with RCD and Loop Test

Reliable performance in tough site conditions

Megger loop and RCD testers are built to withstand real-world job sites. With IP54-rated casings and shock-resistant enclosures, they’re ready for dusty, damp, or unpredictable environments. These rugged designs make them ideal for industrial facilities, outdoor installations, and harsh indoor spaces. Whether you're working in a busy plant or a cramped riser cupboard, you can trust your tester to perform without compromise.

Fast, dependable results in noisy conditions

Thanks to advanced noise filtering and robust signal processing, Megger testers deliver accurate, repeatable results—even in electrically noisy environments. Whether you're dealing with harmonics, background voltage, or interference from nearby equipment, you get consistent readings you can trust. That means fewer retests, faster workflows, and confident handovers to clients.

No-trip testing that keeps the power on

With Megger’s non-trip loop testing, you can verify earth loop impedance on RCD-protected circuits without tripping them—keeping power flowing during inspection. This is especially valuable in residential or commercial settings where downtime is disruptive. You stay compliant with safety standards while minimising inconvenience to tenants or customers.

Intuitive features for smarter, faster testing

Megger testers are designed for ease of use, with large backlit screens, simple rotary dials, and clear measurement displays. Features like automatic frequency detection and straightforward menus reduce testing time and user fatigue. Whether you're an experienced contractor or new to testing, Megger tools help you work smarter, not harder.

Frequently asked questions

What’s the difference between a loop tester and an RCD tester?

A loop tester checks earth loop impedance to verify fault current paths and ensure protective devices will operate correctly. An RCD tester simulates a leakage fault to confirm that the residual current device trips within the correct parameters. For greater efficiency, combination instruments like the LRCD200 series integrate both tests—reducing the need to carry multiple devices and saving time on site.

How does non-tripping loop testing work, and when is it useful?

Non-trip loop testing uses a low test current to calculate earth loop impedance without triggering the RCD. This is crucial when working on live circuits in residential, commercial, or healthcare settings where shutting off power is disruptive. Megger’s non-trip testers deliver safe, accurate results in seconds—helping you stay compliant while keeping critical systems online.

Can these testers be used on three-phase installations?

Yes. Many Megger models, including the LT300 and LRCD220, support loop and RCD testing on both single- and three-phase systems. These testers adapt to a wide range of voltages and frequency conditions, making them ideal for commercial buildings, industrial sites, and large-scale distribution boards. Always check the model spec for compatibility.

What safety and durability features do these testers include?

Megger loop and RCD testers are built to meet CAT III and CAT IV safety ratings, ensuring protection for the user in demanding test environments. They feature robust, IP-rated casings that resist dust, moisture, and mechanical shock—so you can work confidently in wet conditions, cramped panels, or exposed outdoor sites.

Discover the Right Loop or RCD Tester for Your Applications

Need help selecting the ideal tester for your installation environment? Whether you're working in residential, commercial, or industrial settings, our team can guide you to the best loop or RCD testing solution. From single- to three-phase compatibility, non-trip testing, and combination instruments, Megger offers tools to make electrical verification faster, safer, and easier.

Get personalised guidance