Megger LTW425 Loop Impedance Tester

Name: Buy Megger LTW425 Loop Impedance Tester
Brand: Megger
SKU: 125187
Price: 3547 AED
Availability: InStock

Brand: Megger

SKU: 125187

The Megger LTW425 is the high-resolution model in the LTW range, measuring loop impedance to 0.001 Ω and calculating prospective fault current up to 40 kA — non-tripping earth-loop testing for demanding installations.

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Description

Megger LTW425 Loop Impedance Tester — High-Resolution Non-Tripping Testing

The Megger LTW425 is the high-resolution model in the LTW loop-tester range, measuring earth-loop impedance to 0.001 Ω and calculating prospective fault current up to 40 kA. Its low-current no-trip test measures loop impedance without tripping RCD-protected circuits, while a high-current mode delivers precise low-impedance readings across a wide 50–440 V range — making it ideal where the tightest accuracy and highest fault levels must be verified, all in a rugged CAT IV handheld to EN 61557.

Key Features

High-resolution measurement — resolves loop impedance to 0.001 Ω (from 0.001 Ω to 2000 Ω) for the tightest low-Z verification.
Enhanced accuracy — ±5% ±0.01 Ω on the high-resolution range.
Extended PFC range — calculates prospective fault current up to 40 kA for high-fault-level installations.
Non-tripping loop testing — a nominal 15 mA test current measures loop impedance on RCD-protected circuits without tripping.
High-current test — a nominal 4 A test delivers accurate low-impedance loop results where tripping is not a concern.
Wide voltage range — measures supply voltage over 50–440 V (±2% ±1 V).
CAT IV 300 V safety — rated to CAT IV 300 V in an IP54 weatherproof case for site use.
Portable & rugged — runs on 8 × AA cells; 203 × 148 × 78 mm, ~1000 g; −10 °C to +50 °C.

Applications

The LTW425 is ideal for commercial and industrial installations, substations and high-fault-level supplies — verifying earth-fault loop impedance and prospective fault current with high resolution and accuracy, including RCD-protected circuits where non-tripping measurement is essential.

What’s in the Box

Megger LTW425 loop impedance tester
Test lead set
8 × AA batteries (fitted)
Calibration certificate and user guide

Why Buy from MME in UAE

MOHAMMAD MAHDI Electronics Trading LLC (MME) is your trusted supplier of genuine Megger test and measurement equipment in the UAE. We offer competitive pricing, fast local delivery across Dubai, Abu Dhabi and the wider UAE, and knowledgeable after-sales support. Contact us on WhatsApp for the latest price and availability.

Download the Megger LTW425 datasheet (PDF).

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

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