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Megger PAT420 PAT Tester

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£1,164.00 £970.00
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Choose a Special Offer

  • PAT Accessory Bundle
    110V Adapter + Logbook + 1,000 Labels (500 Pass, 250 Cord & 250 Fail) (PATBUNDLE)
  • PAT Handbook, Logbook, 500 Pass / 250 Fail Labels
    PAT Handbook + Logbook + 750 Labels (500 Pass & 250 Fail) (PATBUNDLE3)
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The Megger PAT420 is the upgraded version of the PAT410 and includes all of the basic functionality of the lesser model plus additional 110V operation and additional earth bond testing options at 200mA, 10A and 25A.

A downloadable PAT tester, the PAT420 includes 10000 record on board memory with direct USB download. It also includes a full QWERTY keyboard for easy amendments to testing data.

With both 230V and 110V operation, the PAT420 is suitable for use on a wider variety of appliances than the PAT410. It can be used to perform earth bond and continuity tests, insulation tests at 250V and 500V, substitute/differential/touch current tests and also includes a portable RCD testing function.

Megger PAT420 Downloadable PAT Tester Key Features

  • Downloadable - 10000 record memory with USB download
  • Large-size 5.7" VGA backlit full colour screen
  • 200mA, 10A and 25A bond test with high duty cycle (ideal for repetitive testing)
  • Configurarable - set your own PASS/FAIL limits and adjust testing times
  • Can be used with an optional barcode scanner and printer (saves time typing asset IDs)
  • 230V and 110V operation allows the unit to be used in both commercial and residential applications
  • Integrated QWERTY keyboard for text entry
  • Supply measurement function
  • Insulation testing at 250V and 500V
  • Alternative leakage testing - substitute, differential and touch current
  • Operation test with VA measurements
  • Extension lead tests - earth bond, insulation, polarity and portable RCD
  • Automatic and manual testing routines
  • Compatible with Megger's PowerSuite software (sold separately)

What's Included?

  • Megger PAT420 Downloadable PAT Tester
  • Printed Quick Start Guide
  • Full User Guide on CD
  • Calibration Certificate
  • Continuity/Earth Bond Lead + Probe
  • Extension Lead Adaptor (13A)
  • Carry Case w/ Lead/Document Pouch
  • Plug Adaptor IEC C6 - C13 (3 Way 5A PSU)


There are a number of accessories available for the Megger PAT420 Professional Downloadable PAT Tester; please see the table below for further details. For further information please contact our sales team. 

Our SKU Megger's Part Number  Product
1000-766 1000-766 110V Mains Lead Adaptor BS1363 - BS4343
1000-767 1000-767 415V Adaptor Lead (4 Pin) TO BS (16A)
1000-770 1000-770 415V Adaptor Lead (5 Pin) TO BS (16A)
1000-971 1000-971 Pass Test Labels (1000) Green (UK)
1001-227 1001-227 Fail Test Labels (1000) Red
PT-P700 PT-P700 Barcode Printer Brother P700
1001-047 1001-047 Barcode Scanner (USB)
1001-299 1001-299 PATR210 PAT Report Book
2000-551 1001-232 Plug Adaptor IEC C6-C13 
2000-870 1001-233 Continuity/Bond Lead Set 32A 
1001-234 1001-234 Extension Lead Adaptor 230V UK 13A
MEGPTA8 6220-639 Extension Lead Adapter - 110V 
2001-044 2001-044 PAT Accessory Case
2001-372 2001-372 PAT Testing Guide Book
1004-610 1004-610 Lead USB Type A to Type B 1.8m 
MEGPTA22 6121-483 Barcode Labels (Preprinted) - 1000 per roll
90001-010 9001-010 Printer Cartridge for Brother PT-9500PC
2000-962 1006-225 Carry Case PAT300/400/500
MEGPTA12 1007-165 Flash Test Lead 3.0KV 3.5mA (Red)
1004-610 1004-610 Lead USB Type A to Type B 1.8m 
MEGSW1 1000-631 Powersuite Lite - 17th Edition and PAT Certification Software
Please note that the accessories listed above and the attached datasheets are subject to change. Both were correct at the time of publication. 
Accessories related to this product:
  1. 250 Wm7 Fail Pat Testing Labels 3 for 2
    £7.79 £6.49
  2. 500 x Passed PAT Testing Labels - WM1
    £11.99 £9.99
  3. Megger 17th Edition and PAT Certification Software
    £246.00 £205.00
  4. Megger 17th Edition and PAT Certification Full Database Software
    £436.80 £364.00
Part Code1000-752

Megger PAT420 Technical Specifications

Electrical Supply Range 230V ±10 @ 50/60Hz
110V ± 10% + 110V ±10% @50Hz
Bond Test (10A and 25A)  
Open Circuit Voltage 9V AC ±10% ± 0.1V
(supply: 230V 50Hz)
Earth Bond Resistance Accuracy ±5% ± 3 digits (0 to 0.49Ω)
±5% ±5 (0.5 to 0.99Ω)
Display Range 0 to 1.99Ω
Continuity Test (200mA)  
Continuity Test Voltage 9V AC ± 10% ± 0.1V
(supply: 230V 50Hz)
Continuity Resistance Accuracy ±5% ± 3 digits (0 to 0.49Ω)
±5% ± 5 digits (0.5 to 0.99Ω)
Continuity Resistance Resolution 10mΩ (1 to 19.99Ω)
Display Range 0 to 19.99Ω
Insulation Test (250V and 500V)  
Insulation Resistance Accuracy (230V) ±2% ±5 digits (0 to 19.99MΩ)
±5% ± 10 digits (20 to 99.99MΩ)
Insulation Resistance Resolution 0.01MΩ
Display Range 0 to 99.99MΩ
Substitute Leakage Test  
Test Voltage and Frequency 40V AC ±10% nominal mains frequency
Leakage Current Accuracy ±5% ± 5 digits
Leakage Current Resolution 0.01mA
Display Range 0 to 19.99mA
Differential Leakage Current  
Test Voltage Nominal mains 110/230V AC
Test Frequency Nominal mains 50/60Hz
Differential Leakage Current Accuracy ±5% ± 0.05mA (1.0mA to 9.99mA)
±5% ± 0.1mA (0.1mA to 0.99mA)
Resolution 0.01mA
Display/Measurement Range 0.10mA to 19.99mA
Test Duration User-selectable from 1 sec
10 sec to infinity
Touch Current Test  
Test Voltage and Frequency Nominal mains supply
Touch Current Accuracy ±5% ± 5 digits
Touch Current Resolution 0.01mA
Display 0 to 10mA
Operational Test  
Test Voltage and Frequency Nominal mains supply
VA Rating 230V 3700VA
110V 1800VA
VA Accuracy ±5% ± 10 digits (0 to 99VA)
±5% ± 50 digits (100VA to 999VA)
±5% ± 100 digits (1000VA to 3700VA)
Resolution 1VA (0 to 3700VA)
Display Range 0 to 3990VA
Extension Lead Test  
Tests Performed Bond, insulation and polarity
Polarity Test Voltage 12V
Polarity checks Lead ok
Live neutral S/C
Live neutral reversed
Live/neutral O/C
Portable RCD Test  
Test Voltage and Frequency Nominal mains supply
Test Current Accuracy -8% to -2% (1/2 x I)
+2 to +8% (1 x I, 5 x I)
Trip Time Accuracy ±1% ± 5 digits
Trip Time Resolution 0.1ms
Display Range 0 to 1999ms (1/2 x I)
0 to 300ms (1 x I)
0 to 40ms (5 x I)
Fuse Test  
Test Voltage 3.3V
Warning Audible beep if fuse is OK
Operating Temperature -10 to 50°C
Storage Temperature -20 to 60°C
Humidity 90% RH @ -10 to 30°C
75% RH @ +30 to 50°C
Maximum Altitude 2000m
Ingress Protection IP40
Weight 4.4kg
Dimensions 180 (H) x 255 (W) x 320mm (L)
Safety IEC 61010-1: CAT II 300V
EMC IEC 61326-1: 2006
IEC 61326-2-2: 2005
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