UT281 Series
True RMS Flex Clamps

UT281 series can measure large currents in various harsh and hard to reach environments. They are designed with Rogowski flex coil and can test up to 3000A AC current. UT281A/C are from UNI-T’s Pro Line series, which meet IP54 and 2m drop proof requirements. Due to the ease in operation, accurate readings, stable performance and reliable quality, these flex clamps are ideal tools for electricians.

Models in UT281 series: UT281A, UT281C, UT281E

Features of UT281 Series True RMS Flex Clamps

Certificates: CE, UKCA, cETLus

  • 2m drop proof, ETL/Intertek certified 3rd edition CE
  • Coil diameter: 0.75cm, bending length: 45.7cm
  • Large LCD display for clear reading
  • True RMS
  • Long press INRUSH key for 2s to measure inrush current
  • Data hold, backlight, auto power off

SPECIFICATIONS

Specifications of UT281 Series True RMS Flex Clamps

Specifications Range UT281A UT281C UT281E
AC current (A) 30A/300A/3000A ±(3%+5) ±(3%+5) ±(3%+5)
Frequency response 45Hz~500Hz 

(sine wave)

 √ √ √
Inrush current 0.5A~3000A 

(for reference)

 √ √ √
AC voltage (V) 600V ±(1.2%+3)
Resistance (Ω) 60MΩ ±(1.2%+3)
Frequency (Hz) 20Hz~30kHz ±(1%+2)
Features
Range selection Manual Manual Auto (manual range available in current measurement)
Flex coil size 10”(25.4cm) radius:
1.5”(3.8cm)		 18” (45.7cm) radius:
3.1”(8cm)		 18” (45.7cm) radius:
3.1” (8cm)
Display count 3000 3000 6000 (3000 in current
measurement)
Refresh rate 3 times/s 3 times/s 3 times/s
True RMS √ √ √
Display interface (LCD) Single Single Dual
Data hold/Buzzer √ √ √
Auto power off √ √ √
Low battery indication √ √ √
Backlight/Function selection √ √ √
2m drop test √ √ √
IP rating IP54 IP54
General Characteristics
Power 1.5V battery (R03) x 3
Display 32 x 34mm (1.8 inches)
Product color Red and grey
Product net weight UT281A: 220g; UT281C: 236g; UT281E: 250g
Product size UT281A: 300mm x 150mm x 55mm; UT281C: 350mm x 190mm x 55mm; UT281E: 325mm x 180mm x 30mm
Standard accessories Batteries, PC software CD (UT281A), test leads (UT281E)
Standard individual packing Gift box, blister, English manual
Standard quantity per carton UT281A/UT281C: 8pcs; UT281E: 10pcs
Standard carton measurement UT281A: 580mm x 380mm x 180mm; UT281C: 420mm x 355mm x 425mm; UT281E: 435mm x 380mm x 245mm
Standard carton gross weight UT281A: 4.9kg; UT281C: 6.2kg; UT281E: 6.3kg

APPLICATIONS

Applications of UT281 Series True RMS Flex Clamps

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