KYORITSU KEW 3125A 5 kV Insulation Tester with PI and DAR
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KYORITSU KEW 3125A 5 kV Insulation Tester with PI and DAR
The KYORITSU KEW 3125A applies selectable test voltages from 250 to 5000 V to assess cable, motor and equipment insulation under a defined maintenance procedure. Resistance and test-voltage indications, together with automatic PI and DAR calculations, help the technician compare insulation behaviour over time.
Key Features
- Five selectable test voltages suit different assets and test procedures.
- Automatic polarization index (PI) and dielectric absorption ratio (DAR) calculations.
- Filter function reduces fluctuation in displayed readings.
- Output and automatic-discharge voltage monitoring, with a large backlit display and bar graph.
- A Guard terminal supports insulation tests requiring a separate surface-leakage path, as described in the manual.
Technical Specifications
| Insulation test voltages | 250 / 500 / 1000 / 2500 / 5000 V DC |
| Maximum resistance range | 1000 GΩ at 5000 V |
| Voltage measurement | 30–600 V AC (50/60 Hz), ±30–±600 V DC |
| Nominal short-circuit current | 1.5 mA |
| Power | 8 × LR14 alkaline C batteries (1.5 V) |
| Dimensions | 177 × 226 × 100 mm |
| Approximate instrument weight | 1.9 kg including batteries |
| Measurement category | CAT IV 300 V / CAT III 600 V |
Package Contents
The manufacturer lists the KEW 3125A, 7165A line probe, 7264 earth lead, 7265 guard lead, 8019 hook, 9184 hard case, eight LR14 batteries and instruction manual. Check accessory part numbers against the supplied package on receipt.
Suitable Applications
For qualified maintenance personnel checking insulation on cables, motors and equipment after selecting test voltage and acceptance criteria for the asset. PI and DAR results can be recorded and compared as part of a planned inspection programme.
Important Before Purchase
This is the KEW 3125A, not the 3125B. Insulation testing applies high voltage: isolate the equipment and follow the manual's discharge and voltage-verification procedures before handling conductors. Choose test voltage from the asset's requirements rather than simply using the highest available setting.
Frequently Asked Questions
Does it support 250 V testing? Yes. Selectable DC test voltages are 250, 500, 1000, 2500 and 5000 V.
What do PI and DAR show? They compare insulation resistance at defined time intervals; interpretation depends on the asset and test procedure.
Is this the 3125B? No. This listing is for the 3125A version and its stated specifications and accessories.
Recommended Products
- JADEVER 200 A AC Clamp Meter — For separate load current and voltage measurements during electrical troubleshooting within its ratings.
- JADEVER Non Contact AC Voltage Detector — For preliminary AC voltage detection near wiring; absence of an alert does not verify that a circuit is de energized.
- Three Level AC DC Voltage Tester — For probe based voltage level checks within the tester ratings and the applicable site procedure.
- WISEUP 16 Inch Tool Bag — To organize small inspection tools during transport; check internal dimensions before packing the instrument and accessories.
- WISEUP 100 Piece Screwdriver and Bit Set — For suitable screw fasteners during isolated maintenance; electrical insulation is not implied.
