MOM3 300 A Handheld Micro-Ohmmeter Kit with 5 m Kelvin Clamps

MOM3 300 A Handheld Micro-Ohmmeter Kit with 5 m Kelvin Clamps.

The Megger MOM3 is a 300 A handheld micro-ohmmeter for measuring contact resistance on circuit-breaker contacts, busbar joints, switches, disconnectors, safety-ground connections, welding points, fuses, and cables. Rugged 1.15 kg rubber-bodied design with a built-in shoulder strap; handheld field operation in substations and industrial environments.

Two ultracapacitors deliver up to 300 A through loads ≤2 mΩ, with regulated current held constant for the full test duration. Auto-ranging from 0.1 µΩ to 3000 mΩ across 5 ranges; ±0.1 % of reading ±0.05 % of range. Ultra-short measurement time means no test-object heating — eliminates the bidirectional measurements other micro-ohmmeters require.

Selectable minimum-current guarantee from 5 A to 300 A; pass/fail thresholds settable from 0.1 µΩ to 3000 mΩ. On-board logger stores >2000 measurements in running-numbers mode with timestamps, current, and resistance. USB-C for charging and PC data transfer; optional Wi-Fi communication to the Megger EGIL 200 circuit-breaker analyzer (Wi-Fi variants available Q4 2025). IP54, –20 °C to +50 °C operation, complies with IEEE and IEC standards.

This BK-30381 kit bundles the MOM3 instrument with extended-reach Kelvin clamp test cables — 1.3 m red (GA-00393, 16 mm²) and 5 m black (GA-00394, 25 mm²). The longer black lead suits HV switchgear bays where the test object and ground reference may be several metres apart; the larger 25 mm² conductor area maintains current-carrying capacity over the longer run. Soft carrying case (GD-90070), USB-C charger (HC-04290), USB-C cable (HG-00240), shoulder strap (50-11012), and ground cable (GA-00200) are also included.

Available in pre-configured cable bundles or fully custom configurations via Megger's BK part-number scheme. The 4-position suffix encodes Wi-Fi (0/1), Kelvin cables (0=none, 1=probes, 2=clamps 3m, 3=clamps 5m, 4=probes+clamps 3m), accessory bundle (0/1), and lead style (8=alternative, 9=standard) — so any combination of options can be ordered if the pre-configured kit doesn't match exactly.

The Megger MOM3 300 A Handheld Micro-Ohmmeter Kit with 5 m Kelvin Clamps # BK-30381-US-XX is manufactured by Megger. Valley Instrument Service is an authorized Megger dealer offering full sales support, NIST-traceable calibration, and expert technical assistance.