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The Problem: Slow Insulation Testing Is Costing You Billable Hours
Insulation resistance testing is non-negotiable. Whether you’re commissioning a new installation under AS/NZS 3000, verifying a solar array to AS/NZS 5033 and IEC 62446-1, or running scheduled maintenance on industrial switchboards, you have to prove the insulation holds up. The trouble is, traditional insulation testers can be painfully slow — waiting for readings to settle, manually transcribing results onto paper, then re-keying everything into a report back at the office.
For a time-poor sparkie or solar tech doing dozens of tests a day, those wasted seconds and double-handled data points add up to real money and real risk. Transcription errors creep into compliance documents. Test certificates get delayed. And when a client or auditor asks for evidence, you’re digging through a clipboard instead of pulling a clean digital record.
The Solution: Speed, Range and Wireless Reporting in One Handheld
The KYORITSU KEW 3552BT was engineered to strip the friction out of insulation and continuity testing. At its core is a measurement engine delivering world’s-fastest-class measurement speed of just 0.5 seconds — so you spend less time waiting at the probes and more time moving through the job.
It covers six selectable insulation test voltages — 50V, 100V, 125V, 250V, 500V and 1000V — making it equally at home on low-voltage control circuits, standard 230V domestic and commercial wiring, and higher-voltage solar PV strings. The 1000V range pushes insulation resistance measurement up to 40GΩ, giving you the headroom needed for serious PV and industrial work.
Where the 3552BT really earns its keep is data. The “BT” model adds Bluetooth 5.0 wireless communication and internal memory, so every reading can be saved on the instrument and pushed straight to your phone or tablet via the free KEW Smart Advanced app. No clipboard, no re-keying, no transcription mistakes — just clean, time-stamped records ready to drop into a compliance report.
Key Benefits That Matter on the Job
Lightning-fast 0.5-second measurement → more tests per day → higher productivity. When you’re working through a multi-circuit board or a string of solar panels, half-second readings let you keep a rhythm instead of standing around watching a display settle.
Six test voltages (50V to 1000V) → one tester for nearly every job → less gear in the ute. From sensitive electronics and control wiring at 50–125V, through standard installation testing at 250–500V, to solar and HV applications at 1000V, a single instrument has the range covered.
Bluetooth 5.0 + onboard memory → paperless, error-free reporting → faster certification. Save results on the tester, sync wirelessly to the KEW Smart Advanced app on Android or iOS, and generate professional reports without manual data entry. KEW Report PC software is also available for desktop reporting.
Automatic discharge → safer handling → peace of mind. When an insulation test finishes, any electric charge stored in the tested object is discharged automatically, protecting you from a nasty surprise on capacitive loads like cables and motor windings.
Continuity testing at 200mA → AS/NZS 3000-compliant earth checks → complete verification. Built-in low-resistance continuity testing lets you verify protective earthing and bonding conductors as part of the same workflow.
Rugged build with backlit display → works where you do → reliable in the field. A backlit LCD makes readings easy in dim switch rooms and roof cavities, and the robust housing is rated to handle the knocks of daily trade use.
Technical Specifications
| Specification | Value | Why It Matters |
|---|---|---|
| Insulation test voltages | 50 / 100 / 125 / 250 / 500 / 1000V | Six ranges cover everything from control circuits to solar PV — one tester for the whole site |
| Max insulation resistance | 40.00GΩ (at 1000V) | Ample headroom for high-quality insulation on PV strings and industrial cabling |
| Insulation accuracy | ±2%rdg ±2dgt (first effective range) | Tight tolerance you can stand behind in a compliance certificate |
| Measurement speed | 0.5 sec (world’s fastest class) | More tests per hour means more billable jobs completed each day |
| Rated current | 1.0 to 1.1mA | Meets the load-current requirements for valid insulation testing |
| Continuity range | 40.00 / 400.0 / 4000Ω (auto-ranging) | Covers earth continuity and bonding checks under AS/NZS 3000 |
| Continuity accuracy | ±2.5%rdg ±8dgt | Dependable low-resistance readings for protective conductor verification |
| Continuity test current | 200mA max | Sufficient test current for compliant continuity measurement |
| Voltage measurement | AC 2.0–600V (45–65Hz), DC ±2.0–600V | Confirms a circuit is dead before testing and doubles as a handy voltmeter |
| Voltage accuracy | ±1%rdg ±4dgt | Trustworthy live-voltage detection for safe work practices |
| Auto-discharge | Yes | Automatically discharges the tested object for safe handling |
| Memory | Internal memory (save measured results) | Store readings on the instrument for later sync and reporting |
| Communication | USB + Bluetooth® 5.0 | Wireless data transfer to phone/tablet, USB for PC |
| Compatible apps | KEW Smart Advanced, KEW Power (Android / iOS) | Free apps for live readings, data management and reporting |
| Safety rating | CAT III 600V / CAT IV 300V | Rated for use at the origin of the installation and distribution boards |
| Standards | IEC 61010, IEC 61010-2-034, IEC 61557-1/2/4, IEC 61326-1/2-2 | Designed and tested to international measurement and safety standards |
| Ingress protection | IP40 | Protected against solid objects over 1mm — suited to general site conditions |
| Power source | 4 × LR6/R6 (AA) 1.5V batteries | Easy off-the-shelf battery replacement, no proprietary packs |
| Dimensions | 97(L) × 156(W) × 46(D) mm | Compact enough for a tool pouch |
| Weight | Approx. 490g (incl. batteries) | Light enough for all-day handheld use |
Model family note: The 3550 series comes in three variants. The KEW 3551 is the standard model, the KEW 3552 adds memory, and the KEW 3552BT (this model) adds both memory and Bluetooth communication — the right choice if wireless reporting matters to your workflow.
Applications & Use Cases
Electrical contractors & sparkies: Commission new installations and verify insulation resistance and earth continuity under the AS/NZS 3000 Wiring Rules. Run periodic testing on existing switchboards, submains and final subcircuits, then sync results for instant certificates.
Solar PV installers: Use the 500V and 1000V ranges to test PV array and string insulation resistance in line with AS/NZS 5033 and IEC 62446-1 commissioning requirements. The 40GΩ ceiling and fast readings make string-by-string testing efficient on big rooftop and ground-mount arrays — ideal for CEC-accredited installers documenting handover.
Industrial & facility maintenance teams: Schedule predictive maintenance on motors, cables, transformers and control gear. Trend insulation resistance over time using saved memory data to catch degrading insulation before it becomes a failure or a shutdown.
Technical educators & RTOs: A clear, fast, app-connected tester makes an excellent teaching instrument for TAFE and RTO electrical programs, letting students see live readings on a tablet via Bluetooth.
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