Megger RCDT300 series Residual current device testers
- IP54 weatherproof rugged construction
- Auto (remote) sequence testing capability
- USB test result downloading (RCDT330)
- Programmable RCD range up to 1000 mA
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Description
Introduction to Megger RCDT300 Series Testers
The Megger RCDT300 series represents a new generation of robust, reliable, and easy-to-use residual current device (RCD) testers designed specifically to meet the evolving demands of modern electrical testing environments. These instruments integrate advanced functionality with rugged, site-ready construction, ensuring both accuracy and durability even in the harshest field conditions. Available in three models—RCDT310, RCDT320, and RCDT330—this series combines intuitive operations with comprehensive RCD testing capabilities, making it an essential tool for electricians, electrical inspectors, and contractors across the globe. Each model caters to varying testing requirements, ensuring both residential and industrial applications are thoroughly covered with precision and safety.
Robust Design and Safety: Ultimate Site Readiness
A notable feature of the RCDT300 series is its uncompromising emphasis on safety and physical protection for both user and instrument. The testers come encased in a tough, rubber-armoured case with a foldable display cover, ensuring protection from shocks, drops, and environmental hazards commonly experienced on job sites. The entire range boasts a weatherproof IP54 rating, guarding against dust and water ingress, and stands out with its three-phase safety feature. Even if mistakenly connected to a live three-phase supply, these testers remain undamaged and pose no hazard to the operator. Extensive safety systems, including LED connection indicators, safety interlocks, and voltage inhibit functions, further enhance user protection and prevent accidental misuse.
Intuitive Operation and Time-Saving Features Highlighted
Practicality is at the heart of the Megger RCDT300 series. The interface is free of “buried functions,” allowing users to quickly and confidently select ranges and modes without confusion. Colour-coded ranges support fast selection, reducing test times and minimizing the risk of error. The instrument’s ergonomic design—balanced for comfortable hands-free use—allows it to hang from the user’s neck, enhancing both efficiency and convenience during repetitive testing. A unique “user guide under the lid” provides quick reference while onsite, streamlining workflows and supporting less-experienced operators as well. These combined features make the RCDT300 series not only straightforward to operate but also incredibly efficient for intensive testing schedules.
Comprehensive Testing Functions Covering All Needs
The RCDT300 series supports an exhaustive suite of testing functionalities, adapting to rigorous industry needs. All models in the range perform standard tests (1/2I, I, and 5I) on RCDs rated at 30, 100, 300, and 500 mA. The RCDT320 and RCDT330 extend this capability, accommodating 10 mA and 1000 mA RCDs, programmable RCDs, and centre-tapped 110 V supplies—a crucial factor for industrial and site applications. Both the RCDT320 and RCDT330 feature ramp testing to pinpoint trip currents, and the exclusive auto (remote) sequence testing streamlines multi-step procedures, perfect for when the test instrument and RCD are located in different areas. Touch voltage measurements, selectable inhibit levels, and 0°/180° polarity options further enrich the series’ testing repertoire.
Exclusive Applications Across Residential, Industrial, And Utility
The Megger RCDT300 series stands apart due to its versatility across a broad range of specialized applications. In residential settings, these testers ensure the safety and compliance of circuit protection devices by verifying correct RCD tripping characteristics across various loads. In industrial plants and construction sites, the RCDT320 and RCDT330 handle complex three-phase and centre-tapped supplies, supporting programmable and high-current devices often found in heavy machinery installations. Maintenance engineers benefit from hands-free operation and auto testing features when servicing hard-to-reach breaker panels. For certification and compliance, the RCDT330’s data storage and USB download streamline documentation for quality audits and regulatory reporting—whether for BS7671, VDE 0413, IEC 364, or international standards. Ultimately, wherever safety-critical electrical circuits are installed, the RCDT300 series delivers peace of mind and operational excellence.
Data Handling, USB Download, and Documentation Support
Modern electrical professionals demand clear, efficient reporting and data transfer capabilities. The RCDT330 model answers this need with internal memory capable of storing over 1000 test results, JPEG reference labels, and locations. Once testing is complete, data can be downloaded via USB for further analysis or regulatory submission. The results are compatible with Megger’s CertSuite and other standard reporting software, speeding certification processes and supporting extensive documentation requirements for compliance with UK, European, Australian, and global safety standards. Job reference numbers and result categorization features support projects across multiple distribution boards, circuits, and locations—making routine maintenance schedules and large-site certifications significantly easier to manage.
tpt24: The Best Online Source Worldwide
For professionals seeking authentic Megger RCDT300 series testers, the online store tpt24 is recognized as the world’s premier source for procurement. With its reputation for reliability, technical support, fast logistics, and best-in-class customer service, tpt24 earns the trust of electrical contractors and enterprises globally. Regardless of your location, tpt24 guarantees delivery of your Megger RCDT300 with full authenticity and quality assurance—backed by manufacturer warranty, calibration certification, and original accessories. Ordering from tpt24 means confident purchasing, expert guidance, and after-sales support. Choose tpt24 for peace of mind, fast fulfillment, and world-class service for your electrical safety and testing needs, delivered direct to wherever you are.
Warranty, Compliance, and Technical Excellence Ensured
Every instrument in the RCDT300 series is supplied with calibration certificates and meets or exceeds all relevant international standards, including IEC61010-1 (CAT III 300 V), EN61557, AS/NZS 3000, BS7671, and others. A robust three-year warranty further underlines Megger’s commitment to build quality and reliability. Accessories such as plug-ended and probe/croc-clip test leads are included, and multiple battery options ensure uninterrupted operation—up to 2000 consecutive tests. The testers’ compact dimensions (203 x 148 x 78 mm), low weight (980g), and environmental resilience (operating -5°C to +40°C, IP54 rating) enable full mobility and use under tough, real-world conditions. When protecting people and property is non-negotiable, the Megger RCDT300 series is the industry’s benchmark.
Specifications
| Model | RCDT310 | RCDT320 | RCDT330 |
|---|---|---|---|
| RCD Test Range | 30/100/300/500 mA (standard/selective) | 10/30/100/300/500/1000 mA (prog. RCDs) | 10/30/100/300/500/1000 mA (prog. RCDs) |
| Voltage Range | 100–280 V, 45–65 Hz | 50–280 V, 45–65 Hz | 50–280 V, 45–65 Hz |
| Ramp Testing | No | Yes | Yes |
| Auto Sequence | No | Yes | Yes |
| 0°/180° Polarity | Yes | Yes | Yes |
| Three Phase Safe | Yes | Yes | Yes |
| Touch Voltage Measurement | Yes | Yes | Yes |
| Selectable Touch Volt. Inhibit | Yes (25/50V) | Yes (25/50V) | Yes (25/50V) |
| Result Storage | No | No | 1000+ results, non-volatile memory |
| USB Downloading | No | No | Yes, to PC (CSV/CertSuite) |
| Display | Large, clear LCD | Large, clear LCD | Large, backlit LCD |
| Programmable RCD Steps | No | 1/5/10 mA | 1/5/10 mA |
| Frequency Measurement | No | 25–450 Hz | 25–450 Hz |
| Battery Type | 8 x 1.5V AA (LR6); | 8 x 1.5V AA (LR6); | 8 x 1.5V AA (LR6); |
| Rechargeable NiCd/NiMH compatible | Rechargeable NiCd/NiMH compatible | Rechargeable NiCd/NiMH compatible | |
| Battery Life | ~2000 consecutive tests | ~2000 consecutive tests | ~2000 consecutive tests |
| Weight | 980 g | 980 g | 980 g |
| Dimensions | 203 x 148 x 78 mm | 203 x 148 x 78 mm | 203 x 148 x 78 mm |
| IP Rating | IP54 | IP54 | IP54 |
| Safety Category | IEC61010-1 CAT III 300 V | IEC61010-1 CAT III 300 V | IEC61010-1 CAT III 300 V |
| Warranty | 3 years | 3 years | 3 years |











