UNI-T UT251A High Sensitivity Leakage Current Clamp Meters
The UT251A is a precision instrument engineered to make invisible leakage currents clearly measurable and easily understood. Housed in a compact, pistol‑grip case barely larger than a conventional clamp, it weighs only 120 g yet delivers resolution down to microamp levels, so even minute insulation faults become instantly visible. An intuitive four‑digit LCD, protected against overload “OL” conditions, automatically selects the optimal range and sleeps after five minutes of inactivity to conserve its single 9 V battery ideal for field work or factory floor inspections .
At its core, the UT251A combines high sensitivity with rugged portability. The slim 35 × 40 mm clamp opening fits easily around conductors in confined enclosures, while its CAT III 600 V safety rating ensures reliable performance on live circuits. With an RS‑232 interface built in, logged measurements can be streamed directly to a PC for further analysis or permanent record‑keeping no manual transcription needed. Data hold and peak‑capture modes let technicians freeze or record transient spikes, and an integral mode provides true leakage “integration” over time, rather than a single instantaneous snapshot.
Despite its advanced capabilities, the UT251A stays remarkably user‑friendly. A low‑battery icon appears below 7.2 V, prompting timely replacement before accuracy drifts. Over‑range events trigger a clear “OL” display rather than obscure readings, and its auto‑power‑off feature can be overridden when continuous monitoring is required. Whether you’re verifying safety compliance in motor windings, troubleshooting household appliance faults, or conducting preventative maintenance on industrial equipment, the UT251A brings laboratory‑grade sensitivity into a handheld tool that’s always within reach.
Features:
- 4‑digit LCD display.
- Overload protection with “OL” indication.
- Auto‑range selection.
- Auto‑power‑off after 5 minutes of inactivity.
- RS‑232 interface for data logging.
- Low‑battery indication (alerts at ≤ 7.2 V).
- Peak‑hold function to capture transient spikes.
- Over‑range display (“OL”).
- Data‑hold to freeze readings on screen.
- Test modes: Clamp CT mode and integral (leakage integration) mode.
Specifications:
| Parameter | Specification |
|---|---|
| Leakage Current Ranges: | 0.001 mA–60 A 60 A–199.9 A 200 A–300 A 300 A–600 A |
| Resolution: | 1 µA (0.001 mA–60 A) 0.1 mA (60 A–199.9 A) 1 mA (200 A–600 A) |
| Accuracy: | ±(1.5 %+5) (≤ 199.9 A) ±(2 %+5) (200 A–300 A) ±(3 %+5) (300 A–600 A) |
| Voltage (Freq.): | 0 V–600 V (50/60 Hz) |
| Display: | 4‑digit LCD “OL” overload indication |
| Auto‑Range: | Yes |
| Auto‑Power‑Off: | After 5 min inactivity |
| Peak‑Hold: | Yes |
| Data‑Hold: | Yes |
| Test Modes: | Clamp CT mode Integral (leakage integration) mode |
| Data Storage: | 99 readings |
| RS‑232 Interface: | Yes (for data logging) |
| Low‑Battery Indication: | At ≤ 7.2 V |
| Power Supply: | 1 × 9 V battery (6F22) |
| Clamp Jaw Opening: | 35 × 40 mm |
| Safety Rating: | CAT III 600 V |
| Dimensions: | 175 × 70 × 38 mm |
| Net Weight: | 120 g |
Applications:
- Power Equipment Maintenance.
- Electric Equipment Testing.
- Cable Tracing and Fault Detection.
- Industrial and Residential Safety Checks.
- Environmental Electrical Monitoring.
- Electric Power Distribution.
Package Include:
- 1× 9 V battery (6F22)
- 1× RS‑232 interface cable
- 1× English user manual
- 1× Gift box1 × Carrying bag
- 1× Tool box
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