Megger MOM690 Micro-Ohmmeter (230V) c/w Accessories
Precision Low-Resistance Testing for Switchgear and Substations
Looking for the most reliable way to test contact resistance in high-voltage systems?
The Megger MOM690 Micro-Ohmmeter delivers powerful, precise, and repeatable low-resistance measurements. The MOM690 is made for professional engineers in important substations and tough industrial settings. It provides accurate maintenance with a strong test current of up to 800 A DC and a top resolution of 1 µΩ.
👉 Ready to eliminate costly failures? Book a demo of your Megger MOM690 today and see how you can enhance your maintenance accuracy and drastically reduce downtime. The MOM690 will extend the operational life of critical electrical connections.
Built for Performance, Engineered for Safety
The MOM690 is the essential tool for detecting contact degradation in circuit breakers, disconnecting switches, and bus-bar joints - the key signs that precede overheating and equipment failure.
- Powerful Testing: Offers up to 800 A DC output current, ensuring precise testing even on heavily oxidized contacts and highly inductive loads.
- Intuitive Operation: Features automatic range selection, current control, and an easy-to-read digital display, making it simple to operate even in demanding field conditions.
- Safety Integrated: Safety is integral to the design, featuring a miniature circuit breaker, thermal fuse, and induction protection to safeguard both the user and the instrument.
- Stable Readings: Utilises full-wave rectified (pulsating DC) current to achieve stable, precise resistance measurement without the risk of excessive internal heating.
Megger MOM690 Key Features:
| Feature | Specification | Benefit |
| High Test Current | Up to 800 A DC output (230V model) | Measures highly resistive or oxidized connections with confidence. |
| Measurement Range | 0-200 mΩ with 1 µΩ resolution | Offers the precision needed for modern high-voltage equipment. |
| CT Demagnetisation | Built-in AC output | Quickly and easily demagnetises current transformer cores post-DC test. |
| Data Management | Stores up to 30 test results | Allows rapid data recall and simplifies field documentation. |
| PC Control (Optional) | MOMWin™ PC Software | Enables remote control, advanced data transfer, and professional report generation. |
| Build Quality | Compact, rugged, and protected by internal fuses/breakers | Designed to withstand heavy use in harsh utility environments. |
Technical Summary (230V Model)
| Parameter | Value |
| Mains Voltage | 230 V AC ± 10%, 50/60 Hz |
| Max Output Current | 800 A DC |
| Measurement Range | 0-200 mΩ |
| Resolution | 1 µΩ |
| Operating Temperature | 0-50°C |
| Dimensions | 350 x 270 x 220 mm |
| Weight (Unit Only) | 23.7 kg |
| Compliance | CE, LVD, EMC, RoHS |
What comes with the MOM690?
The MOM690 is supplied complete with the standard current and sensing cable set, earth lead, and a protective transport case, ensuring you are ready to test right out of the box.
- Megger MOM690 Unit
- Standard Current and Sensing Cable Set
- Earth Lead
- Protective Carry Case
Optional Accessories:
- MOMWin™ software package for PC-based control and analysis.
- Calibration shunt 600 A/60 mV (BB-90024).
- Extension cable sets for 5 m, 10 m, and 15 m configurations.
❓ Frequently Asked Questions (FAQ)
Q1: Why is the AC output useful?
A. The AC output is primarily used for demagnetising Current Transformer (CT) cores, a common requirement after DC resistance testing on dead-tank or GIS breakers.
Q2: Can I manage data and reports from my PC?
A. Yes. With the optional MOMWin™ software, you can control the instrument, export test data, and generate comprehensive reports for compliance and documentation.
Q3: Does it have a manual testing mode?
A. Yes. The instrument supports both automatic range and current control (AUTO mode) and manual testing (MAN mode).
Enhance your maintenance workflow with the precision and reliability of the Megger MOM690 Micro-Ohmmeter - available now.
Note: Be sure to check the official datasheet before buying, and the user manual before using any test equipment. Need training? Just reach out - we’re happy to help