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

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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Safety and maintenance standards The instrument complies with : UL61010-1,and CSA C22.2 No.61010-1 (between ground and input terminal) and EN 61010-1(2001) and EN61557. „ Operating altitude : below 2,000m. „ Operating environment: for indoor use, expose to pollution level II. „ This is a precision device. During use or storage, do not go beyond its spec. to prevent any possible damage or danger. „ Do not put this device in direct sunlight or where it is hot and/or damp. „ Remember to turn OFF the power after use. For long storage, remove the battery to prevent the battery from leaking to cause damage to the parts inside. „ Clean the device with a dry soft cloth. Wet cloths, liquid and water are prohibited.

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Safety precautions and procedures This instrument conforms with safety Standard EN 61010-1 related to electronic measuring instruments. For your own safety and to avoid damaging the instrument follow the procedures described in this instruction manual and read carefully all notes preceded by this symbol .

When taking measurements: „

Avoid doing that in humid or wet places. Avoid doing that in rooms where explosive gas, combustible gas, steam or excessive dust is present. TM-601N/603/604 EN-13 „ Keep you insulated from the object under test. Do not touch exposed metal parts such as test lead ends, sockets, fixing objects, circuits etc. „ Avoid doing that if you notice anomalous conditions such as breakages, deformations, fractures, leakages of battery liquid, blind display etc. „ Be particularly careful when measuring voltages exceeding 20V to avoid risks of electrical shocks.

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