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        Learn more by watching our STL-5 Low Voltage Test Lamp | Fused 240/415V | CAT IV 450V video.

        Additional related video.

        Additional related video.

        Nesco | Low Voltage Test Lamp Fused 240/415V | CAT IV 450V

        The Nesco STL-5 is a fused low voltage test lamp rated for 240V and 415V mains testing, categorised CAT IV 450V. The STL-5 gives a visual indication only: the lamp illuminates when voltage is present and stays dark when the circuit is dead. It is supplied as a complete set of leads and probes, ready to use straight out of the pouch.

        Proving dead is the step in an isolation procedure that carries the most consequence. Instrumentation that depends on batteries or a display can fail silently between verification checks. The STL-5 indicates on the supply voltage itself, so there is no calibration interval and no screen interpretation. The fused 240/415V design and CAT IV 450V category rating suit overhead lines, underground pillars and pits, and low voltage switchboards.

        Australian electricians keep a set of test lamps in the vehicle because they survive decades of jobsite handling. The STL-5 presents a low impedance load to the conductors under test. Capacitively induced voltage on a de-energised circuit will not illuminate it, where a high impedance multimeter can display a false indication. Apprentices become competent with it in minutes, which explains its continuing presence in TAFE workshops. A single set covers both 240V and 415V distribution systems.

        Features

        • Fused test leads — the STL-5 leads carry an internal fuse, limiting energy if the lamp is applied across a fault or a higher supply than expected.
        • CAT IV 450V rating — approved for testing at the origin of the installation, including service entrances, meter panels and outdoor supply points.
        • Dual 240V and 415V operation — one set covers single phase and three phase low voltage systems without changing tools or settings.
        • Visual lamp indication — the lamp lights when voltage is present and stays dark when it is not, giving a plain go or no-go result.
        • No battery or power source — the STL-5 draws from the circuit under test, so there is nothing to go flat between jobs.
        • Low impedance test method — the lamp loads the circuit, so induced voltage on a de-energised conductor does not produce a false indication.
        • Prove for dead — designed for isolation and proving procedures on overhead lines, underground pillars and pits, and low voltage switchboards.
        • Colour coded leads — supplied in white, black and red so phase, neutral and earth connections stay clear at a glance.
        • Complete set supplied — the STL-5 arrives with everything needed to start testing, with no separate probes or leads to buy.
        • Light carry weight — 0.384kg packaged, so the set adds almost nothing to a tool bag carried up a ladder all day.
        • Indication only, no measurement — the STL-5 shows presence or absence of voltage and does not display a numeric value, so it does not replace a multimeter for readings.
        • Test the tester — the lamp must be proved on a known live source before and after each isolation test to confirm it is working.

        Where to use

        • Low voltage switchboards — the STL-5 proves dead at main switches, submains and outgoing circuits before panels are opened for work.
        • Overhead line work — confirms isolation on low voltage overhead supply where a low impedance indication matters more than a numeric reading.
        • Underground pillars and pits — the STL-5 suits damp confined work where a simple lamp result is faster to read than a meter display.
        • Isolation and lockout procedures — used as the proving step between isolating a supply and applying earths or starting work.
        • Three phase distribution — the 415V rating covers phase to phase checks on motors, DOL starters and three phase submains.
        • Service and meter panels — the CAT IV 450V rating covers testing at the origin of supply where fault energy is highest.
        • Apprentice and TAFE training — a straightforward first tester that teaches proving procedure without screen interpretation.
        • Fault finding on dead circuits — confirms which conductors remain live before tracing a fault back through a board.

        The STL-5 is not a measuring instrument and gives no numeric voltage, current or resistance reading. It is rated for low voltage systems up to 450V CAT IV and must not be applied to high voltage apparatus. Use on extra-low voltage control and data circuits will not produce a meaningful indication.

        Verified Sparky Direct customer reviews: STL-5 Low Voltage Test Lamp (STL-5)

        "Never be without one of these." — Michael

        "Great product and greatly priced" — Sharon

        "Brilliant tester, especially when a low impedance tool is required." — Angelec

        (STL-5)

        CAT IV 450V means the test lamp is rated for use at the origin of a low voltage installation, including service entrances, meter panels and outdoor supply points, where prospective fault energy is highest. It covers testing up to 450V in that category.

        Prove the lamp on a known live source first, apply the probes to the isolated conductors, then prove the lamp on the known live source again. The lamp lighting indicates voltage is present. No illumination after a valid prove-test indicates the circuit is dead.

        No batteries are required. The lamp draws its indication energy from the circuit under test, so there is nothing to charge or replace. That also means the lamp cannot indicate on a de-energised circuit, which is why proving on a known live source before and after each test is essential.

        Both are covered. The lamp is rated for 240V and 415V, so it suits single phase circuits and phase to phase checks on three phase submains, motors and starters. No range selection or switching is needed between the two.

        A test lamp loads the circuit, so induced or ghost voltage on a de-energised conductor does not produce a false indication the way it can on a high impedance meter. A multimeter is still needed where an actual voltage value must be recorded.

        Warranty runs one year for domestic use and one year for commercial use, starting from the invoice date. The warranty method is return to Sparky Direct. Warranties are void where a product requiring installation has not been installed by a licensed electrician.

        The set is supplied complete and ready to use, with colour coded leads in white, black and red and an integral fuse in the lead assembly. Nothing further needs to be purchased before testing begins.

        The Nesco STL-5 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.

        100-Day Fuss-Free Returns
        We want you to love what you buy—but if you change your mind, that’s okay too. That’s why Sparky Direct offers a 100-day money-back guarantee.

        • Items must be unused, with all parts, accessories, and original packaging.
        • We can’t accept returns if the product is damaged, incomplete, or not in resalable condition.
        • Proof of purchase is required.
        • Return shipping is the responsibility of the customer. 

        If your item isn’t in its original condition, please contact us before returning it—we might save you time and money.

        All products come with a manufacturer’s or supplier’s warranty

        • Warranty starts from the Invoice Date
        • Some suppliers offer in-home warranties and handle claims directly, so you won’t need to uninstall or return the product. Chat with us to check if your product qualifies.
        • Sparky Direct isn’t responsible for losses caused by product failure.
        • Warranties are void if products aren’t installed by a licensed electrician.

        Damaged or Faulty Goods
        If your order arrives damaged or is faulty, let us know within 24 hours.

        • Sparky Direct will pay for return shipping via an emailed return label.
        • If the fault is confirmed, we will send you a replacement item or provide a refund.

        Contact us via our chat to arrange the return.

        Exclusions
        We can’t accept returns for:

        • Items that have been installed, modified, or used
        • Clearance, End of life, Discontinued, or special order items (unless faulty)
        • All PPE Items
        • Goods returned without original packaging or proof of purchase

        How to Request a Return

        1. Contact our customer service team with your order number.
        2. Confirm it’s eligible under our return or warranty policy.
        3. Pack the item securely and return it using a trackable service.
        4. Once we receive and inspect it, we’ll process your refund or replacement.

        Warranty starts from Invoice Date

        Domestic Use: 1 Year
        Commercial Use: 1 Year
        Warranty Method: Return to Sparky Direct

        These specifications and characteristics outline physical, mechanical, electrical details.

        Brand Nesco
        SKU STL-5
        Barcode # 932333600883
        Package Weight 0.384kg
        View Datasheet
        TYPE VALUE
        Type Tools
        Brand Nesco
        Colour White | Black | Red
        Voltage (V) 240/415
        Fused 240/415V
        Information CAT IV 450V

        Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.

        Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.

        Tools sold by Sparky Direct must be used safely and in accordance with the manufacturer’s instructions. Customers are responsible for ensuring they have the necessary knowledge and competence to operate any tool purchased. If you are unsure how to safely or correctly use a tool, do not use it and seek guidance from the manufacturer or a suitably qualified professional.

        Nothing in this clause limits or excludes any rights or guarantees available under the Australian Consumer Law.

        For website terms and conditions https://www.sparkydirect.com.au/terms-of-use

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