Megger MOM600A 600 A Micro-Ohmmeter

The MOM600A is specifically engineered for field use in high‑voltage substations and industrial plants where contact resistance of critical connections must be kept very low to avoid overheating and failure. It delivers a DC output from 0 to 600 A and is capable of measuring resistances down to the micro‑ohm range (0–1,999 µΩ) with a resolution of 1 µΩ. 
Its compact, rugged design features a robust transport case, flexible heavy‑duty current cables and separate sensing cables for four‑terminal (Kelvin) measurement, enabling accurate results in challenging environments from arctic cold to tropical heat. 
For example, when performing a test at 600 A output the instrument supports a maximum load period followed by a rest time to avoid overheating, with required mains input and power consumption designed for industrial power supplies. In short, the MOM600A allows technicians to verify the integrity of contacts in switch‑gear, isolators, bus‑bars and other high‑current links before failure, thereby supporting preventive maintenance and reliability of heavy electrical installations.

Features

• Up to 600 A DC output current for testing heavy‑duty electrical connections.

• Resistance measurement range from 0 to approximately 1,999 µΩ, with 1 µΩ resolution.

• Accuracy of ±1% of reading + 1 digit when using test currents in the 100‑600 A range.

• Four‑terminal (Kelvin) measurement setup using separate current cables and sensing cables to minimise lead resistance impact.

• Rugged, field‑ready construction with a durable carrying case and heavy‑duty cable set designed for harsh environments (extreme cold to hot).

• Suitable for critical applications such as high‑voltage circuit breaker contacts, busbar joints, disconnecting switches and knife‑contact fuses.

• Mains powered (115 V or 230 V versions) with dedicated power consumption and protection features like thermal cut‑outs and miniature circuit breakers.

Includes

Included in the standard kit:

• MOM600A Tester

Included in the Accessory Kits

• GA-05053 Cable Set
• GA-00200 Ground Cable
• GD-00010 Transport Case