KYORITSU 3125B Digital High Voltage Insulation Tester 5kV | KEW 3125B
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Kyoritsu 3125B High Voltage Insulation Tester — Standard for Insulation Testing
The Kyoritsu KEW 3125B High Voltage Insulation Tester is the industry-recognised de facto standard for high voltage insulation testing, trusted by electrical professionals worldwide. Often called a 5kV megger or megohmmeter, it offers insulation resistance measurement up to 1TΩ, short-circuit current up to 1.5mA, and a wide test voltage range from 250V to 5000V. With PI and DAR diagnosis functions, a robust and ergonomic design, this tester is built for demanding industrial, electrical and substation applications.
Key Specifications
| Specification | Details |
|---|---|
| Model | KEW 3125B |
| Test Voltage | 250V / 500V / 1000V / 2500V / 5000V |
| Insulation Resistance | Up to 1TΩ |
| Short Circuit Current | 1.5mA |
| Voltage Measurement | 30 to 600V AC (50/60Hz), ±30 to ±600V DC |
| Accuracy | ±5%rdg±3dgt (insulation), ±2%rdg±3dgt (voltage) |
| Power Source | DC12V: LR14/R14 (size C) × 8pcs |
| Dimensions | 177(L) × 226(W) × 100(D)mm |
| Weight | 1.9kg (with batteries), 4kg (with accessories) |
| Safety Standard | IEC 61010-1, CAT IV 300V / CAT III 600V |
| Compliance | Complies with EU regulations (CE marked) |
| Brand | Kyoritsu |
| Origin | Japan |
Test Voltage & Measuring Range
| Test Voltage | Measuring Range |
|---|---|
| 250V | 0.0 to 100.0MΩ |
| 500V | 0.0 to 99.9MΩ, 80 to 1000MΩ |
| 1000V | 0.0 to 99.9MΩ, 80 to 999MΩ, 0.80 to 2.00GΩ |
| 2500V | 0.0 to 99.9MΩ, 80 to 999MΩ, 0.80 to 9.99GΩ, 8.0 to 100.0GΩ |
| 5000V | 0.0 to 99.9MΩ, 80 to 999MΩ, 0.80 to 9.99GΩ, 8.0 to 99.9GΩ, 80 to 1000GΩ |
Kyoritsu 3125A vs 3125B comparison
| Feature | 3125A | 3125B (this model) |
|---|---|---|
| Status | Discontinued, replaced by 3125B | Current model |
| Hard carrying case | 9181 | 9204 |
| Safety rating | – | CAT IV 300V / CAT III 600V |
| Best for | Existing users and spares | New purchases of a 5kV insulation tester |
Features & Benefits
- Wide Test Voltage Range — 250V to 5000V
- Insulation Resistance up to 1TΩ
- PI and DAR Diagnosis Function
- Robust & Ergonomic Design
- Noise Filter Function
- Large Display with Bar Graph & Backlight
- Live Voltage Warning
- Auto Discharge Function
Standard Accessories
- 7165A Line probe
- 7264 Earth cord
- 7265 Guard cord
- 8019 Hook type prod
- 9204 Carrying case (Hard)
- LR14 alkaline batteries × 8
- Instruction manual
Optional Accessories
- 7168A Line probe with alligator clip
- 7253 Longer line probe with alligator clip
- 8302 Adaptor for recorder
Applications
- High voltage cable and motor insulation testing
- Substation and switchgear maintenance
- Industrial equipment insulation diagnosis
- Power generation and transmission testing
- Preventive and predictive maintenance programmes
Why Choose Kyoritsu KEW 3125B?
- Industry de facto standard for high voltage insulation testing
- Wide 250V–5000V test voltage range — a true 5kV megger
- Insulation resistance measurement up to 1TΩ
- Advanced PI and DAR diagnostic functions
- IEC 61010-1 CAT IV 300V / CAT III 600V certified
- Comes complete with tough hard carrying case
- Trusted Kyoritsu professional instrument quality — Made in Japan
| Warranty period | 1 Year Warranty |
|---|---|
| Coverage | Free repair or replacement for defects in material and workmanship arising during normal use within 1 year from the date of purchase. Test leads, probes and plug leads supplied with the instrument are covered for 1 year against production defects. |
| Not covered | Fuses and batteries; normal wear of test leads and probes (cuts, burns, broken tips, worn insulation); damage from accident, dropping, overload, misuse, or use outside the instrument's rated specifications. |
| Warranty void if | The instrument has been opened, repaired or modified by a party not authorised by Kyoritsu or its Malaysian distributor. |
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Free delivery for orders above RM500 with a total weight under 22kg. Otherwise, delivery charges are calculated at checkout based on your order’s weight and delivery location.
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Please notify us within 14 calendar days of receiving your product to request a free exchange or full refund, if eligible. We will cover all return shipping costs, and no restocking fees will apply in this case.
Requests made after 14 days may be accepted at our discretion and will be subject to a 10% restocking fee. Techno Tools & Equipment reserves the right to reject any return request found to be ineligible.
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