.ut-cat{color:#333;font-family:Arial,Helvetica,sans-serif;line-height:1.5;} .ut-cat h4{color:#1a1a1a;font-size:1.15em;margin:1.5em 0 .5em;padding-bottom:.25em;border-bottom:2px solid #ccc;} .ut-cat h2{color:#1a1a1a;font-size:1.25em;margin:1.2em 0 .4em;} .ut-cat h3{color:#222;font-size:1.05em;margin:1em 0 .3em;} .ut-cat p{margin:.6em 0;} .ut-cat ul{margin:.5em 0;padding-left:1.4em;}.ut-cat li{margin:.25em 0;} .ut-cat img{max-width:100%;height:auto;} .ut-cat table{border-collapse:collapse;width:100%;margin:.5em 0;} .ut-cat th,.ut-cat td{border:1px solid #ddd;padding:6px 10px;text-align:left;vertical-align:top;} .ut-cat td strong{color:#222;} Overview The UT281F pairs a flexible 1100 mm coil with power measurement: it reads AC current up to 10 kA on large or awkward conductors and, beyond current, measures active, apparent, and reactive power with power factor and phase angle — so you can assess load behaviour on a big feeder, not just its current. It's rated CAT III 1000 V / CAT IV 600 V. True-RMS sensing, a dual display, Bluetooth 5.0 for transfer, and storage for 1050 result sets make it a documentation-ready tool for utility and industrial power work. It's backed by UNI-T's nearly 40 years of test-meter manufacturing. Key Features Flexible 1100 mm coil for large and awkward conductors AC current up to 10 kA (45 Hz–1000 Hz) Power measurement: active, apparent, reactive, with power factor and phase angle True-RMS measurement; dual display AC/DC voltage to 1000 V; resistance to 60 MΩ; continuity Bluetooth 5.0 for data transfer; 1050-set storage CAT III 1000 V / CAT IV 600 V; AA battery power UT281F Details Flexible-Coil High-Current Measurement The 1100 mm flexible coil wraps around busbars, cable bundles, and large conductors a rigid clamp can't reach, measuring AC current up to 10 kA across a 45 Hz–1000 Hz band. Power, Not Just Current Beyond current, the UT281F measures active, apparent, and reactive power with power factor and phase angle — so you can see how a feeder is actually loaded and where reactive power and poor power factor are costing capacity. Documentation-Ready True-RMS sensing on a dual display, Bluetooth 5.0 transfer, and storage for 1050 result sets make it straightforward to capture and move power readings for reports and load studies. Compare the UT281 Series UT281E+ UT281F Max AC current 9.99 kA 10 kA Inrush current Yes — Power measurement — Active / apparent / reactive, PF, phase Connectivity — Bluetooth 5.0 Data storage 999 sets 1050 sets Jaw opening 1000 mm 1100 mm Applications Feeder and busbar power studies; load and power-factor assessment on large industrial and utility circuits; high-current measurement on conductors a clamp can't reach; and maintenance work that needs power figures documented. Frequently Asked Questions What does the UT281F measure beyond current? Active, apparent, and reactive power, with power factor and phase angle. How large a conductor can it measure? Its 1100 mm flexible coil wraps around large busbars and cable bundles; AC current measures up to 10 kA. How is it different from the UT281E+? The UT281E+ measures current with inrush capture; the UT281F adds full power measurement and Bluetooth 5.0 transfer. Specifications DC Voltage In 1000 V AC Voltage In 1000 V AC Current In 10 kA AC Current Frequency 45 Hz to 1000 Hz Frequency Range 10 Hz to 30 kHz Internal Resistance Range 60 MΩ Max Resistance 60 MΩ Power Factor -1 to 1 Phase Angle -360°–360° True RMS Yes Continuity Yes Dual Display Yes Data Communication BT 5.0 Data Storage 1050 sets CAT Rating CAT III 1000 V , CAT IV 600 V Jaw Opening 1100 mm Display Type Dual LCD Battery 3× AA Ambient Temperature Range 0 °C to 40 °C Frequency Response 50 Hz to 500 Hz
