Klein Tools | Circuit Tracer 33kHz Advanced Transmitter/Receiver Kit | Orange/Black
The Klein Tools ET450AU is a professional-grade circuit tracer test kit rated 33kHz frequency, designed to locate energized and de-energized wires, breakers, and fuses through solid materials. The ET450AU combines a transmitter, receiver with non-contact voltage detection, and a hard carrying case with all accessories included, enabling electricians to trace circuits accurately without direct contact to live conductors.
Electricians on active jobsites often face the challenge of tracing circuits behind walls, through concrete, or underground without visual access to the wire run. The ET450AU solves this by transmitting a 33kHz signal that penetrates drywall, cement block, and soil, allowing remote identification of circuit paths on projects where conduit and wire are buried or concealed. Retrofit work, fault diagnosis, and new installations all demand fast, accurate circuit location, and the kit reduces guesswork and callbacks.
Licensed electricians value the ET450AU for its eight adjustable receiver sensitivity levels, enabling signal detection across materials of varying thickness and density. The kit includes separate voltage indicators (12V, 48V, 120V, 240V, 480V detection) on the transmitter and a non-contact voltage test function on the receiver, so tracing work is integrated with safety verification. The combination of transmitter and receiver in one hard case means one tool handles both circuit identification and voltage confirmation, keeping tool counts low on the van and on the job.
Features
- Transmitter 33kHz frequency — establishes consistent signal output for reliable receiver detection across multiple circuit configurations and installation depths.
- Eight receiver sensitivity levels — adjustable range allows tuning to materials from thin drywall to thick concrete blocks, ensuring flexibility across diverse site conditions.
- Separate voltage indicators on transmitter — 12V, 48V, 120V, 240V, and 480V detection labels tell the operator which circuit they are tracing without probe contact, enhancing safety during diagnosis.
- Non-contact voltage (NCV) function on receiver — 80 to 1000V AC detection at 50/60Hz, confirming de-energized state before work begins and preventing accidental shock from overlooked live lines.
- Signal strength indicators — audible tone and LCD 0-99 bar display provide real-time feedback on signal strength, helping the operator position the receiver for maximum accuracy.
- Built-in flashlight on receiver — 6 lumens of LED illumination for low-light jobsite work, dimly lit attics, and basements where tracing often occurs.
- Blade and ground prongs supplied — direct connection to mains supply or circuit under test without requiring external adapters, reducing setup time on the jobsite.
- Alligator clips and lead adapters — 3-foot and 20-foot test leads included, enabling transmitter connection at various distances from the receiver, useful for large commercial panels and distributed circuits.
- Hard carrying case with handle — durable transport protects both transmitter and receiver during van storage and site transit, keeping components organized and ready for immediate deployment.
- Long battery life — transmitter rated approximately 24 hours, receiver approximately 28 hours of continuous operation, sufficient for multi-day jobsites without mid-shift battery changes.
- Auto-power-off safety feature — transmitter shuts down after 4 hours, receiver after 10 minutes of inactivity, reducing battery drain and accidental equipment left on after work is complete.
- Tracing depth limited by material — maximum effective tracing distance is approximately 0.5 metres depending on soil type, conduit material, and wire gauge; does not penetrate metal-clad or shielded installations.
Where to use
- Circuit identification on switchboards — the ET450AU traces individual breaker positions to circuits without opening panels or removing wires, enabling safe circuit mapping on unfamiliar electrical installations.
- Fault diagnosis on buried conduit runs — underground or in-slab cable routes are located and traced without excavation, verifying circuit continuity and identifying intermittent faults in concealed installations.
- Retrofit and renovation work — adding circuits to existing homes and commercial buildings requires fast identification of available capacity and spare positions, which the ET450AU confirms without trial-and-error shutdown testing.
- Attic and cavity wall installations — wiring concealed in roof spaces, partition cavities, and floor voids is traced from outside the cavity, pinpointing wire bundles and confirming routing before installation proceeds.
- Commercial and industrial switchroom work — large multi-panel installations and three-phase boards benefit from rapid circuit identification, reducing downtime during maintenance, testing, and fault finding.
- Testing de-energized circuits safely — before working on any concealed wire, the receiver's NCV function confirms safe shutdown, protecting the tradesperson from unexpected energized lines.
The Klein Tools ET450AU is not designed for tracing wires inside metal conduit or shielded cables; the metal sheathing blocks the 33kHz signal transmission. It is also unsuitable for tracing data, coax, or low-voltage signal cables, which operate at different frequencies and do not carry the transmitter's signal. Do not use the ET450AU on circuits exceeding 480V AC or on DC installations with voltage above the transmitter's rated range.
Verified Sparky Direct customer reviews: Klein Tools ET450AU Advanced Circuit Tracer Test Kit (ET450AU)
"Top quality and easy to use, great kit to have in the tool kit." — Darren
"Seems to work well so far" — Jackson
"Very easy to use and great asset for my old house in tracing the circuits" — Scott
