Megger LTW315-EU-BS Loop Impedance Tester 2 Wire, 3 Wire 440V ±10% CAT IV 300 V, IEC 61010 LTW315

  • RS Stock No. 198-435
  • Mfr. Part No. LTW315-EU-BS
  • Manufacturer Megger
Technical data sheets
Legislation and Compliance
RoHS Status: Not Applicable
COO (Country of Origin): GB
Product Details

LTW 300 Series

Earth loop impedance testers to verify the loop impedance of a live electrical circuit without the need to disconnect the electrical supply. The LTW300 series instruments offer a safe and easy 2 wire loop testing solution that does not trip 30mA RCDs and can be used on a wide range of voltages.

Backlit display
0.01Ω resolution
No-trip loop test on circuits with RCDs of ≥30 mA
3 phase circuits with RCD protection can be tested
Tests radial circuits where the circuit does not return to the origin, even where only a phase and neutral contacts are available.
10 second non trip loop test time with Auto test extension up to a further 10 seconds if noise is detected, to improve the accuracy of the test
High current loop testing for supplies that do not have an RCD fitted
AUTO START will start the loop test running as soon as the test leads are connected; no need to press the test button means much safer testing
PFC Display up to 20kA
Voltage and frequency measurement
110Vac systems including 110V centre tap to earth (55V phase to earth) can be tested on the secondary winding.
IP54 Weatherproof case
Optional 10A fused 2 wired test leads and crocodile clip set
Complies with IEC61010-1 300V CATIV safety standard and meets EN61557

Voltage measurement  
(ac only) 50V to 440V
Accuracy ±2% ±1V
Range 25Hz to 99.99Hz
Accuracy ±0.1Hz
A warning will be shown if applied voltage exceeds 440V
Damage will occur if applied voltage exceeds 600Vrms
Loop testing  
No-trip loop and high current loop test  
Source voltage LTW315: 100V to 280V (50Hz)
LTW325: 50V to 440V (50Hz)
Display range 0.01Ω to 2000Ω
Accuracy ±5% ±0.03Ω
Nominal test current No-Trip loop test 15 mA (at nominal 230Vac supply) High current loop test 4 A (at nominal 230 Vac supply)
Operational range 0.30Ω to 1000Ω
Prospective Fault Current (PFC)  
Prospective fault current Measured Source Voltage / Loop resistance
Maximum range 40 kA; accuracy is derived from loop test and voltage measurement.
EN61010 Designed to EN61010-1 ed2 2001-02 Designed for 300 volts to Earth Category IV, with Phase to Phase voltages to 440 Volts; Fuse protected to 600 volts rms ac
EN61557 Complies with the following parts of EN61557, Electrical safety in low voltage systems up to 1000V ac and 1500V dc- Equipment for testing, measuring or monitoring of protective measures: Part1-General Requirements; Part3-Loop resistance
Power supply  
Battery 8 x 1.5V cells IEC LR6 type (AA alkaline)
Rechargeable 8 x 1.2V NiCd or NiMH cells
Battery life 2000 consecutive tests
Weight 1000g ±10% excluding test leads
Dimensions 203 x 148 x 78 mm


RS is an authorised Megger distributor. Purchased though RS this product is eligible for the Megger extended 3 Year warranty

Supplied with

Test lead set with crocodile clips, mains socket test lead, 8 AA alkaline batteries, hard carry case and instructions.

Attribute Value
Loop Impedance Test Type 2 Wire, 3 Wire
Maximum Voltage Measurement 440V
Best Loop Test Accuracy ±10%
Non-Trip Loop Test Yes
Safety Category CAT IV 300 V, IEC 61010
Display Type LCD
Battery Type AA
Battery Life 2000 Tests
Power Source Battery
Dimensions 203 x 148 x 78mm
Weight 1kg
Height 78mm
Maximum Operating Temperature +50°C
Safety Category Voltage 300V
Width 148mm
Model Number p LTW315
Length 203mm
Minimum Operating Temperature -10°C
Safety Category Level CAT IV
Temporarily out of stock - back order for despatch 03/10/2019, delivery within 1 working days from despatch date.
Price (ex. GST) Each
$ 1,265.00
(exc. GST)
$ 1,454.75
(inc. GST)
Per unit
1 +
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