Megger LTW425 Loop Impedance Tester
Click to enlarge

    Megger LTW425 Loop Impedance Tester

    Compare
    (No Reviews)

    The Megger LTW425 is a rugged, high-precision loop impedance tester designed for electricians and engineers who need fast, reliable results. It offers both high-current and non-trip test modes to ensure accurate measurements without tripping RCDs, making it ideal for residential, commercial, and industrial installations. Its large backlit display, intuitive interface, and portable design make on-site testing quick, safe, and efficient.

    Terms of sending goods ›
    • In-stock items are delivered within 2 business days.
    • We are not Supporting COD Payments Terms Outside UAE
    • For out-of-stock items, delivery may take 2 to 4 business weeks.
    SKU: 125187 Category:
    Brand:Megger

    AED 3,547 (excl.VAT)

    Order in WhatsApp
    Order Via phone number
    In stockDelivers in 2-3 business days.
    Description

    Megger LTW425 Loop Impedance Tester

    The Megger LTW425 is a top-tier loop impedance tester engineered for professional electricians, commissioning engineers, and maintenance technicians who require precise and efficient verification of loop impedance on low-voltage circuits. Designed with accuracy, safety, and speed in mind, the LTW425 is the go-to solution for ensuring correct operation of circuit protection devices such as fuses, MCBs, and RCDs in accordance with BS 7671 wiring regulations.

    Equipped with advanced measurement technology, the LTW425 delivers fast, repeatable, and highly accurate results, even in noisy electrical environments. It supports both high- and low-current testing modes, enabling safe loop testing without tripping RCDs, making it ideal for use on modern installations and sensitive circuits.

    The instrument features a large backlit display with clear digital readouts and an intuitive user interface, making it easy to read results even in poorly lit environments. Additional features such as automatic and manual test modes, simple test lead connections, and a straightforward menu system improve efficiency and reduce downtime on the job.

    Built for demanding field conditions, the LTW425 boasts a rugged, ergonomic design with superior drop protection and IP-rated casing for resistance against dust and moisture. Its compact, lightweight build ensures easy portability between job sites, while its long battery life supports extended use during busy workdays.

    Whether you are commissioning a new installation, performing periodic inspections, or troubleshooting complex circuits, the Megger LTW425 provides the performance and reliability needed to get accurate results the first time, every time.

    Megger LTW425 Key Features

    • High-speed loop impedance testing with exceptional accuracy
    • Supports high-current and non-trip low-current test modes
    • Large backlit display for easy reading in all lighting conditions
    • Automatic and manual test modes for maximum flexibility
    • Rugged, compact design built for demanding site conditions
    • Long battery life for extended field use
    • Compliant with BS 7671 and IEC testing requirements

    Technical Highlights

    • Measurement Type: Loop impedance on live and dead circuits
    • Test Current: High- and low-current (non-trip) modes
    • Display: Large, backlit digital display
    • Test Modes: Automatic sequencing and manual operation
    • Safety Rating: Suitable for CAT-rated installations to BS 7671
    • Power: Battery-operated, portable design
    • Accuracy: Optimized for precise, repeatable field results

    What’s in the Box Megger LTW425

    • Megger LTW425 Loop Impedance Tester
    • Test leads and probes
    • Battery pack (pre-installed)
    • User manual and quick start guide
    • Protective carry case
    Datasheet

    Datasheet

    Mme-pdfs-image

    Specifications

    Specifications

    General Specification

    • Only values with tolerances or limits are guaranteed data. Values without tolerances are for information only.

    Accuracy Basis

    Condition Specification
    Ambient temperature 23 °C ± 2 °C
    Nominal source voltage 230 V AC ± 1%

    Voltage Measurement (AC only)

    Range Accuracy
    50 V to 440 V ±2% ±1 V

    Frequency Measurement

    Range Accuracy
    25 Hz to 99.99 Hz ±0.1 Hz
    • Warning: Indication shown if applied voltage > 440 V.
    • Damage threshold: Applied voltage > 600 V rms may cause damage.

    Loop Testing – Accuracy (by model & supply)

    Model Supply Accuracy
    LTW315 100 V AC & 280 V AC ±10% ±0.03 Ω
    LTW325 / LTW335 100 V AC & 300 V AC ±10% ±0.03 Ω
    LTW425 — ±10% ±0.02 Ω
    LTW325 / LTW335 50 V AC ±15% ±0.03 Ω
    LTW425 50 V AC ±15% ±0.03 Ω
    All (ref at 230 V AC) 230 V AC ±5% ±0.03 Ω

    NO-TRIP Loop & High-Current Loop Tests

    Parameter LTW315 LTW325 / LTW335 / LTW425
    Source voltage 100 V to 280 V (49–50.1 Hz) 50 V to 440 V (49–50.1 Hz)
    Display range 0.01 Ω to 2000 Ω
    Accuracy ±5% ±0.03 Ω
    Nominal test current (No-Trip) ≈ 15 mA @ 230 V AC
    Nominal test current (High current) ≈ 4 A @ 230 V AC
    EN61557 operational range 0.30 Ω to 1000 Ω

    High-Resolution Loop Test (LTW425 only)

    Source voltage 50 V to 440 V (50 Hz)
    Display range 0.001 Ω to 2000 Ω
    Accuracy ±5% ±0.01 Ω
    Nominal test current ≈ 4 A @ 230 V AC
    EN61557 operational range 0.30 Ω to 1000 Ω

    Prospective Fault Current (PFC)

    PFC = Measured Source Voltage / Loop Resistance

    Mode Maximum Range
    No-Trip mode 20 kA
    High-current mode 20 kA
    High-resolution mode 40 kA

    Accuracy derived from loop test and voltage measurement.

    Environmental

    Operating temperature -10 °C to +50 °C
    Operating humidity 90% RH non-condensing at +40 °C max
    Storage temperature -25 °C to +70 °C
    Max altitude (safety) 2000 m
    Ingress protection IP54

    Safety

    • Designed to IEC61010-1
    • Designed for 300 V to Earth Category IV; phase-to-phase up to 440 V
    • Fuse protected to 600 V rms AC

    EN61557 Compliance

    • Part 1 – General Requirements
    • Part 3 – Loop resistance

    EMC

    • In accordance with IEC61326-1

    Power Supply

    Battery (alkaline) 8 × 1.5 V cells, IEC LR6 (AA)
    Rechargeable 8 × 1.2 V NiCd or NiMH cells
    Battery life Up to 2000 consecutive tests

    Mechanical

    Weight 1000 g ±10% (excluding test leads)
    Dimensions (W × H × D) 148 × 203 × 78 mm

    Patents

    • UK Patent no. 0518089.9
    • European Patent no. 06119110.2
    • US and Canadian patent application
    Reviews (0)
    0 reviews
    0
    0
    0
    0
    0

    Reviews

    Clear filters

    There are no reviews yet.

    Be the first to review “Megger LTW425 Loop Impedance Tester”
    Read more

    Recently viewed Products