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        Learn more by watching our Major Tech MT312 | RCD/ELCB Loop & Polarity Tester | With Carry Case video.

        Major Tech MT312 | RCD/ELCB Loop & Polarity Tester | With Carry Case

        The Major Tech MT312 is a compact RCD/ELCB, loop impedance, and polarity tester for 3-wire AC systems. It offers quick, reliable loop verification, fault detection, and RCD testing, with intuitive LED status indicators and a clear LED/LCD display. The built-in Non-Contact Voltage (NCV) feature allows safe detection of live AC voltage without direct contact.

        Designed for professional use, it supports automatic loop testing and displays results using a colour-coded LED scale: Green (Good), Orange (Check), Red (Urgent). During RCD testing, it measures trip time up to 99.9ms and emits a 10-second buzzer when the RCD/ELCB successfully trips. It also includes magnetic mounting for hands-free operation on switchboards and supports interchangeable lead sets, such as the optional MT350L.

        Major Tech MT312 Features

        • 3-in-1 tester: RCD/ELCB, loop impedance, and polarity testing
        • NCV detection: Safely detect live voltage without contact
        • Colour-coded LED indicators: Instantly identify wiring status
        • RCD trip time measurement: Up to 99.9ms with audible confirmation
        • Hands-free use: Magnetic back and compact, lightweight design

        Where to use this Major Tech MT312

        • RCD and ELCB testing: Residential and commercial safety checks
        • Loop and wiring verification: During installation or fault diagnosis
        • Service, field, and workshop testing: Portable and practical for daily use

        (MT312)

        The MT312 is a 3-in-1 tester that checks loop impedance, RCD/ELCB trip time, and polarity in 3-wire AC systems. It helps electricians verify wiring safety and circuit protection during installation or fault finding.

        No, the test leads are sold separately. The MT312 is compatible with the Major Tech MT350L lead set, which is designed for plug-in connection and accurate testing.

        The MT312 uses a quick colour guide: Green means good, Orange suggests a potential issue, and Red indicates a serious wiring or fault condition that needs attention.

        It applies a controlled test load and measures how quickly the RCD or ELCB trips. The tester displays the trip time (up to 99.9ms) and sounds a buzzer when the device disconnects correctly.

        The MT312 combines three key safety checks into a single unit —loop impedance, RCD/ELCB trip timing, and polarity-saving time—and reduces the need for multiple tools.

        Yes, Sparky Direct sells the MT312 and delivers Australia-wide.

        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.

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

        Brand Major Tech
        SKU MT312
        Model # MT312
        Barcode # 6008229043093
        Package Weight 0.452kg
        Package Width 0.070m
        Package Height 0.211m
        Package Length 0.136m
        View Datasheet
        View Manual
        TYPE VALUE
        Type Tester
        Brand Major Tech
        Rated Tripping Current 10mA, 20mA, 30mA
        Voltage Indication (V) 25V to 264V AC
        RCD Test Voltage (V) 230
        Fault Trip Time 99.9ms max. Buzzer alert for 10 seconds when ELCB trips
        NCV Bar graph display & Buzzer alert
        0.0

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