Fluke 355 True-RMS 2000 A AC/DC Clamp Meter

355 2000 A true-RMS clamp meter explained

The Fluke 355 True-RMS 2000 A Clamp Meter (355) is a heavy-duty true-RMS clamp meter for high-current work. A 58 mm jaw clamps large conductors and the instrument measures up to 1400 A AC and 2000 A DC, voltage to 1000 V, resistance and frequency. Seven Star LLC supplies 355 in Oman and the GCC as an independent supplier in Muscat, not affiliated with the manufacturer.

The 355 shares a datasheet with the 353; the table below decodes the identifiers specific to the 355.

355 technical specifications

Values are from the manufacturer product page and the 353/355 data sheet. The 355 is rated for indoor use.

How the Fluke 355 True-RMS 2000 A Clamp Meter works

The 355 uses a large Hall-effect jaw so that both AC and DC currents flow through its sensor without contact. The extra-wide jaw takes conductors typically used in high-current feeds, such as parallel cable runs and busbars.

In-rush mode measures the peak of motor starting current, and a low-pass filter smooths noisy loads. MIN, MAX and AVG are available to record changes, and the large display is backlit.

Key features

• Jaw of 58 mm for large conductors
• In-rush current mode
• Low-pass filter
• Voltage to 1000 V and resistance with continuity beeper
• Frequency to 1 kHz

Where 355 fits and related Fluke models

The 355 is the instrument for feeders, transformer secondaries, battery banks and large motors. For smaller conductors and lower currents the 325 or 374 FC is easier to handle. When even larger or awkwardly routed conductors are involved, an iFlex-based clamp (375 FC) gives up to 2500 A AC.

The 353 is the 1400 A sibling that shares the datasheet.

Selection checklist for 355

Confirm the following points before ordering, so that the instrument matches the work and the safety rules of your site.

• Maximum current: 1400 A AC, 2000 A DC.
• Jaw diameter 58 mm.
• Indoor use only (IP 42).
• Weight 0.8 kg; consider a case and strap.

Safe use, care and maintenance of 355

• Close the jaw fully and check that the faces are clean. Dirt or rust on the jaw faces causes reading errors, and a jaw that does not close completely should be taken out of service.
• Clamp only one conductor at a time. Two conductors of a single-phase pair or a three-phase set cancel each other and the 355 will show a value close to zero.
• Verify the clamp on a known live circuit before and after any test that decides whether equipment is safe to touch.
• Replace batteries when the low-battery indicator appears and remove them for long storage. Inspect the test leads for damage before each use of the voltage and resistance functions.
• Keep the jaw and display free of dust. In dusty Gulf sites, use the supplied case and wipe the instrument after switchgear room work.
• Respect the maximum conductor size and never clamp bare busbars unless the rating and your site procedure allow it. Treat the clamp as a measuring tool, not a switch or an isolator.
• Allow the instrument to reach ambient temperature after moving it from an air-conditioned vehicle into a hot plant area, so that condensation does not form inside the housing and the display settles.
• Schedule periodic calibration through your quality system, and keep the certificate with the instrument record so that readings used for reports remain traceable.

Typical applications of 355 in Oman and the GCC

Clamp meters are used for load checks on motors, feeders, chillers and pump drives. In Oman, maintenance teams at oil and gas plants, power and water utilities, desalination units and petrochemical sites use them for current surveys without opening circuits. A clamp reading showing a motor drawing more than its nameplate current points to a mechanical overload, a supply imbalance or a failing winding, while a reading near zero on a running pump suggests a lost phase or dry running. Because the circuit stays intact, these checks can be done on live equipment under a permit, which keeps downtime low during the hot summer months when cooling and pumping loads peak.

In Oman the 355 is used on DC battery systems in substations, on large pump and compressor feeders and on welding or electrolytic supplies. Its inrush mode helps commission motors and verify that starting current stays within protection settings.

355 compared with nearby models

The 374 FC and 375 FC extend range via an optional iFlex probe.

Information to send with an RFQ for 355

To prepare an accurate quotation, please send:

• Exact model 355 and the quantity required.
• Maximum conductor size and expected current, so the jaw or flexible probe option can be confirmed.
• Whether wireless or smartphone use is needed on site.
• Any extra accessories such as a hanging strap, leads or a case.
• Calibration traceability paperwork if required on delivery.
• Delivery point in Oman or elsewhere in the GCC and the required date.

Documents and quotation

A manufacturer datasheet for the Fluke 355 True-RMS 2000 A Clamp Meter is attached on this page so that you can check the full specification before ordering. Please review it against your site requirements.

For a quotation, send the part number 355, the quantity and your delivery location in Oman or the GCC through the RFQ button on this page. Availability and lead time are confirmed per request.