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        Learn more by watching our Major Tech MT310 | Socket ELCB Tester video.

        Additional related video.

        Additional related video.

        Major Tech | Socket and Earth Leakage Tester 230V AC | CAT IV 300V Rated

        The Major Tech MT310 is a plug-in socket and earth leakage tester for 3-wire 230V AC circuits, rated CAT IV 300V and CAT III 600V. The MT310 confirms socket wiring and polarity through neon indicators and shows the measured AC voltage on an LCD display. Six fixed trip current settings from 10mA to 35mA let the operator test an earth leakage circuit breaker from the outlet.

        Verifying a run of outlets means confirming polarity and earth continuity at the socket, not only at the switchboard. Unpacking a multimeter and test leads at every point interrupts the sequence. A plug-in tester reads the circuit in seconds, and the AC voltage indication on the LCD confirms supply level at the same time. On rental turnovers and pre-handover inspections, that saves repeated walks back to the switchboard.

        For a licensed electrician the MT310 sits in the top of the tool bag and earns its place on fault-finding call-outs. Plug it in, interpret the neon indication, and the wiring status is established before an appliance attracts blame. The six fixed test currents from 10mA to 35mA also demonstrate that an earth leakage circuit breaker operates correctly on site. It functions as a compact secondary tester an apprentice carries alongside the primary instrument.

        Features

        • Socket ELCB testing — tests earth leakage circuit breakers on 3-wire 230V AC circuits directly from a standard socket outlet.
        • Six fixed test currents — 10, 15, 20, 25, 30 and 35mA settings, selected before the test is run.
        • 10mA saturation setting — the lowest setting is used for testing saturation and to eliminate nuisance tripping.
        • Separate test button — the trip test runs from a dedicated button, kept clear of the wiring indication function.
        • AC voltage on LCD — the MT310 displays measured AC voltage from 150V AC to 245V AC while plugged in.
        • Neon wiring indication — bright neons show wiring correct, no earth, live and neutral reversed, no neutral, live and earth reversed, or no live.
        • Test current accuracy — rated at plus or minus 1.75mA at 220V AC across the selectable current range.
        • CAT IV 300V and CAT III 600V — the MT310 carries measurement category ratings suited to 230V distribution circuits.
        • Double injection rubber housing — the moulded body takes knocks in a tool bag and on site.
        • 130g compact body — measures 130 x 69 x 32mm and weighs 130g, so it travels in a pouch rather than a case.
        • Fixed current settings only — test current is stepped between six values rather than ramped, and the display shows voltage rather than a trip time.
        • 230V system operation — the MT310 operates on 230V systems and indicates voltage across a 150V AC to 245V AC span.

        Where to use

        • New circuit verification — confirms polarity and earth at each outlet once a new run of GPOs is energised.
        • Rental and pre-handover checks — the MT310 lets an electrician walk a property and check every socket in one pass.
        • Fault-finding call-outs — settles whether a dead or misbehaving appliance sits on a correctly wired outlet.
        • Earth leakage breaker testing — trips the protecting device from the socket using a selected current between 10mA and 35mA.
        • Nuisance tripping investigations — the 10mA setting supports saturation testing where a breaker trips without an obvious cause.
        • Switchboard upgrade work — confirms outlets read correctly after new earth leakage protection is fitted at the board.
        • Apprentice and second-tester duty — the MT310 gives a trainee a simple check tool that leaves the main meter free.
        • Maintenance rounds — the 130g body suits routine socket checks across a facility or a portfolio of properties.

        The MT310 is built for 3-wire 230V AC socket outlets and is not intended for other supply systems. Voltage indication covers 150V AC to 245V AC, so it does not stand in for a general purpose meter across a wider range. It plugs into an outlet and does not connect to fixed wiring or bare terminals.

        Verified Sparky Direct customer reviews: Major Tech MT310 | Socket ELCB Tester (MT310)

        "It's simple, cheap and does the job." — Graeme

        "Very good product showing voltage and polarity status." — Kelly

        "Brilliant piece of handy test equipment." — Dave

        (MT310)

        Plug the tester into a 3-wire 230V AC socket outlet. Select a test current between 10mA and 35mA, then press the separate test button. The protecting device should trip. Neon indicators show the wiring status of the circuit and the LCD shows measured AC voltage.

        The display shows measured AC voltage, from 150V AC to 245V AC. Test current is selected from six fixed settings: 10, 15, 20, 25, 30 and 35mA. There is no trip time readout, so the tester confirms that a device trips rather than how quickly it trips.

        The tester operates on 230V systems and tests 3-wire 230V AC circuits. Voltage indication runs from 150V AC to 245V AC, which covers standard Australian single phase supply measured at the outlet.

        The neons indicate wiring correct, no earth, live and neutral reversed, no neutral, live and earth reversed, and no live. Reading the neon pattern settles the wiring status of the circuit before any test current is applied.

        The 10mA setting is used for testing saturation and to eliminate nuisance tripping. Starting low and stepping up through 15, 20, 25, 30 and 35mA shows the current at which the protecting device operates.

        Warranty runs two years for domestic use and two years for commercial use, starting from the invoice date. The warranty method is return to Sparky Direct, and the unit is then forwarded to an authorised service centre for assessment. Warranty is void where products are not installed by a licensed electrician.

        The Major Tech MT310 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: 2 Year
        Commercial Use: 2 Year
        Warranty Method: Return to Sparky Direct

        All Major Tech Meters sold through Sparky Direct are covered by the manufacturer’s warranty. If you believe your meter is faulty or defective, you may request an assessment under this warranty policy.

        How to Lodge a Warranty Claim

        To initiate a warranty claim:

        1. Return to Sparky Direct
          Ship the meter back to Sparky Direct along with:

          • A copy of your proof of purchase
          • A brief description of the issue
          • Your contact details

          Please ensure the unit is securely packaged to prevent damage in transit.

        2. Forwarded for Assessment
          Upon receiving your meter, we will forward it to Major Tech’s authorised service centre for inspection, testing, and calibration.

        Assessment Process

        Major Tech’s service lab will assess the returned unit to determine:

        • Whether the fault is due to a manufacturer’s defect (covered under warranty), or
        • If the issue is the result of user error or no fault is found.

        Outcomes

        • If approved under warranty: The product will be repaired or replaced at no cost to you.
        • If not covered under warranty: The lab may offer repair services, which will be quoted and billed directly to you by the service provider.

        Important Notes

        As Major Tech’s service labs are independent providers, Sparky Direct cannot govern or guarantee turnaround times or any costs incurred for repairs outside of warranty coverage.

        Please allow up to 7-14 working days for the return of your product.

        Specifications

        Function Range Accuracy
        Voltage measurement 150VAC to 245VAC ± (10%)
        Frequency response 50/60Hz  
        Test current 10, 15, 20, 25, 30, 35mA ± (1.75mA @ 230VAC)
        Socket polarity Yes
        Enclosure Double Injection moulding
        Display LCD
        Weight 130g
        Dimensions 130 x 69 x 32mm
        Safety Specs IEC61010-1 CAT III 600V

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

        Brand Major Tech
        SKU MT310
        Barcode # 6008229007217
        Package Weight 0.250kg
        View Datasheet
        TYPE VALUE
        Type Tester
        Brand Major Tech
        Height (mm) 32
        Width (mm) 69
        Length (mm) 130
        Voltage (V) 230

        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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        Write a review

        Bob Guthrie

        amended review on 24 May 2022

        My original post was in error and I wish to apologise and correct it. The spec in the manual clearly states the display with change to 0L if the real voltage exceeds 245V and this is what my unit does. The slight problem is my display seems to be about 5V above actual so it can display up to about 249V before tapping out (at around ~244.5V. Major Tech were good enough to call me and explain the situation.
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