Megger SDRM202 – Resistance Measurement Accessory for TM Series & EGIL
A perfect accessory for the TM1700, 1800 & EGIL Series
The Megger SDRM202 is a high-performance Resistance Measurement accessory designed for use with Megger’s circuit breaker analysers TM1800, TM1700, EGIL200, and EGIL. Built to provide both static and dynamic resistance measurements (SRM and DRM), this lightweight unit enables accurate assessment of high-voltage circuit breakers and other low-resistive devices.
When connected to compatible analysers, the Megger SDRM202 records the current flowing through the breaker and the corresponding voltage drop across its contacts. From this, it calculates resistance as a function of time – a vital diagnostic process for identifying contact wear, verifying maintenance, and ensuring safe, efficient breaker operation.
Why Choose the Megger SDRM202?
- Accurate testing – provides precise Resistance Measurement for both static and dynamic applications.
- Compact and lightweight – at just 1.8 kg, it’s easy to transport and handle on site.
- Quick set-up – time-saving connectors and flexible cables simplify test preparation.
- High current capacity – capable of up to 200 A initial test current per channel.
- Versatile compatibility – supports TM1800, TM1700, EGIL200, and EGIL analysers.
- Reliable performance – designed for harsh substation and industrial environments.
With these benefits, the Megger SDRM202 streamlines circuit breaker diagnostics, reducing downtime and increasing confidence in the condition of critical HV assets.
Applications:
The Megger SDRM202 is specifically developed for:
- Static Resistance Measurement (SRM): Checking the condition of closed breaker contacts and detecting unwanted resistance that can signal contact deterioration.
- Dynamic Resistance Measurement (DRM): Evaluating breaker performance during operation, making it possible to detect contact movement, timing, and wear under load.
These applications are crucial for power utilities, service companies, and maintenance engineers who require accurate, field-ready Resistance Measurement equipment.
Technical Highlights:
- Two current sources for simultaneous resistance testing on two breaks (when analyser channels allow).
- Up to 200 A DC instantaneous current ensures effective testing, even in low-resistance devices.
- Flexible current cables remain manageable even in cold weather.
- Durable housing rated IP43 (with SDRM cable attached) for field use.
- Accuracy:
- TM1800 / TM1700: 1 % ± 1 μΩ
- EGIL200: 1.5 % ± 1 μΩ
- Measurement ranges:
- SRM: 0 – 6 mΩ (TM1800/TM1700), 0 – 32 mΩ (EGIL200)
- DRM: 0 – 32 mΩ
The SDRM202 complies with CE, LVD, EMC, and RoHS standards, giving users assurance of both safety and environmental responsibility.
Technical Specifications (Summary)
| Feature | Details |
| Operating temperature | –20 °C to +50 °C |
| Storage temperature | –40 °C to +70 °C |
| Relative humidity | 5 % – 95 % non-condensing |
| Power input | 24 V DC / 2.5 A |
| Dimensions | 160 × 240 × 90 mm |
| Weight | 1.8 kg (4 lbs), 11 kg with case and accessories |
| Safety classification | CAT I, Pollution degree 2 |
| Shock resistance | 30 g, half-sine, 11 ms |
These specifications ensure that the Megger SDRM202 Resistance Measurement accessory performs consistently in demanding field environments.
Typical Use Cases:
- Utility substations – validating breaker condition during routine inspections.
- Industrial power systems – ensuring reliable operation of switchgear in factories and plants.
- Field service teams – portable enough for mobile engineers working across multiple sites.
- Research and training – providing reliable Resistance Measurement data for diagnostic education and equipment evaluation.
What comes with the Megger SDRM202?
Depending on the analyser used, the Megger SDRM202 kit includes the following accessories:
- SDRM Cable (for TM1800, TM1700, or EGIL)
- SDRM multi-cable extension
- Voltage sense lead and extension (EGIL models)
- Red and black current cables
- Ground cable
- Clamps (for EGIL kits)
- DC power supply
- Rugged transport case
Optional extras such as three-phase SDRM cables and extended 10 m multi-cable extensions are also available.
❓ Frequently Asked Questions (FAQ)
Q1: What analysers are compatible with the Megger SDRM202?
A: It works with TM1800, TM1700, EGIL200, and EGIL analysers. EGIL units must have the SDRM option installed, and EGIL200 requires the SDRM or Plus software licence.
Q2: What is the difference between static and dynamic resistance measurements?
A: Static resistance measurement checks the resistance of stationary breaker contacts, while dynamic resistance measurement monitors resistance during breaker operation to reveal wear or irregularities.
Q3: How much current does the Megger SDRM202 deliver?
A: It can supply up to 200 A DC instantaneously per channel, making it suitable for accurate testing of low-resistance components.
Q4: Can the SDRM202 perform three-phase tests?
A: Yes. With the correct accessories and analyser configuration (such as EGIL213 or TM1800/TM1700 with the necessary channels), three-phase testing is possible.
Q5: Is the Megger SDRM202 suitable for field conditions?
A: Absolutely. It is built to withstand vibration, shock, and extreme temperature variations common in substations and industrial sites.
The Takeaway
The Megger SDRM202 is an essential tool for engineers and technicians who need reliable and precise Resistance Measurement on high-voltage circuit breakers. Its compact size, wide compatibility, and ability to perform both static and dynamic tests make it a cost-effective and dependable accessory for the TM series and EGIL analysers.
By investing in the Megger SDRM202 Resistance Measurement accessory, organisations can extend the life of their circuit breakers, minimise downtime, and improve the reliability of critical electrical infrastructure.