The Megger MOM690 Micro-ohmmeter is a versatile, high-performance tool engineered for measuring contact resistance in high-voltage circuit breakers, disconnecting switches, and busbar joints, ensuring reliability in critical power systems. Delivering up to 800 A DC, it measures resistances from 0 to 2000 µΩ with ±1% accuracy, featuring automatic range setting to streamline testing. Its unique AC output simplifies demagnetization of current transformers in dead tank and GIS breakers, meeting standards that recommend this process post-testing, and serves as a multi-purpose current source. Weighing 23.7 kg (230 V) or 24.7 kg (115 V), it includes a sturdy transport case and 5 m current and sensing cables, with optional 15 m sets for extended reach.
The built-in software enables individual or sequential tests with result storage, exportable to a PC via the optional MOMWin software for detailed analysis. Designed for high-voltage substations and industrial environments, it operates from 0°C to 50°C, with safety ensured by a miniature circuit breaker and thermal fuse. A USB service port enhances data handling, making the MOM690 an essential asset for engineers aiming to detect faults, maintain system integrity, and prevent overheating-related failures in power infrastructure.
