Fluke 373 True RMS AC Clamp Meter

Fluke 373 True-RMS AC Clamp Meter

The Fluke 373 is a 600 A True-RMS AC clamp meter built for electrical contractors, utility crews, industrial maintenance teams, and electrical engineers in Ireland who need a rugged, accurate clamp meter for daily current and voltage checks on three-phase distribution and plant equipment. It is the day-to-day Fluke clamp meter that earns its space in the toolbox by being reliable, repeatable, and the right size for the work most electricians actually do.

True RMS matters because real electrical loads are no longer purely sinusoidal. Variable speed drives, switch-mode power supplies, LED lighting, and modern motor controllers all distort the current waveform. An average-responding clamp meter under-reads on these loads. A true-RMS clamp meter reads correctly. On a fault investigation or a load study, that is the difference between finding the problem and missing it.

What the Fluke 373 measures

• True RMS AC current: up to 600 A AC through the jaw, accurate on non-linear loads.
• True RMS AC voltage: up to 600 V AC for distribution and plant work.
• DC voltage: up to 600 V DC for control circuits, battery systems, and DC drives.
• Resistance and continuity: for circuit checking and basic fault finding.
• Frequency: useful where VFDs and standby generation are involved.
• Display hold and backlight: practical features for working in cramped or poorly-lit panels.

The 373 sits in the middle of the Fluke 370 family. Above it, the 374 / 375 / 376 add larger current ranges (up to 1400 A AC and 2000 A AC on the 376) and extra functions; below it, simpler models drop the True-RMS capability. For most three-phase distribution work in Ireland, 600 A AC is the right ceiling.

Specifications: what to confirm before you order

Target users and applications

• Electrical contractors carrying out commissioning, fault finding, and routine maintenance
• Industrial maintenance technicians checking motor loads, distribution feeders, and panel currents
• Utility crews verifying load and voltage on the distribution network
• Building services electricians measuring lighting, HVAC, and plant loads
• Renewable installers checking inverter output, BESS strings, and AC distribution

Typical applications include load measurement on distribution boards, motor running current checks, voltage verification on plant feeders, troubleshooting nuisance trips, and routine PAT-adjacent in-service checks. The Fluke 373's safety rating and rugged build are the reason it survives the daily knocks of site work where a softer instrument would not.

As authorised Fluke distributor in Ireland, Powerpoint Engineering supplies the Fluke 373 alongside the wider Fluke clamp meter and multimeter range, and supports them with in-house calibration and repair in our own lab.

FAQs

Why does True RMS matter on a clamp meter?

True RMS clamp meters give accurate current and voltage readings on distorted waveforms produced by VFDs, switch-mode power supplies, and modern electronic loads. Average-responding meters under-read on these waveforms, sometimes by 20 to 40 percent, which can hide real overload conditions during a load study or fault investigation.

What is the difference between the Fluke 373 and the 376?

The 373 is rated to 600 A AC. The 376 extends the AC range to 1000 A and adds a flexible iFlex current probe for measurements up to 2500 A and access to awkward conductors. For typical three-phase distribution and plant work, the 373 is sufficient; for higher-current substation and feeder work, the 376 is the right step up.

Does the Fluke 373 need calibration?

Yes. As a precision measurement instrument, the Fluke 373 should be recalibrated periodically to remain trusted on contract and reporting work. Powerpoint Engineering's calibration laboratory recalibrates Fluke clamp meters in-house and supplies a traceable certificate.

To match the right Fluke clamp meter to your daily work, request a quote or speak to our team for compatibility advice.