Megger MFT1721 Multifunction Tester

98 % of 100



  • Suitable for single and 3 phase installation testing
  • Patented 2 wire anti-trip loop test
  • Tests 3 phase and Type B RCD's
  • Robust and reliable
  • Availability: IN STOCK
More Information
Price MatchYes
Warranty3 years
Socket & See VIPUKIT3 Safe Isolation Kit 3

Megger MFT1721 Multifunction Tester

The Megger MFT1721 is a mid-range 18th edition multifunction tester from Megger, suitable for testing single and three phase installations found in domestic, industrial and commercial environments. Each Megger MFT in the 17XX series also has a Max. Zs function, ensuring testing final ring circuits is quick and easy.

Max. Zs test Megger MFT

Megger build quality

Every Megger Multifunction Tester is built to last, it won’t go bang when dropped, bounced, left out in the rain, connected across phases or even locked on and connected to a live circuit. This tough reputation is topped off with a 3 year warranty (with product registration) for complete peace of mind. The MFT1721 is also IP54 rated against dust and moisture.

Differences between MFT1711 and MFT1721

The Megger MFT1721 is designed for engineers who require more testing scope in their day to day work. The features below come as standard on the Megger MFT1721.

  • 100V insulation test range
  • 15mA continuity test
  • 2 Wire Phase to Phase L-L 50 V ~ 500 V loop test
  • R1 + R2 value
  • 3 Phase RCD (no earth)
  • 1000mA RCD test
  • Phase rotation
  • Type B (pure DC) RCDs
  • SP5 switch probe for remote testing

These additional features are often considered as ‘future proofing’ simply as it reduces the chance of coming across part of an installation a user is unable to test. For example a 100V insulation range and 15mA continuity test are ideal for use on inductive loads or simply to save power. Whilst type B RCD testing is useful for solar PV installations and three phase systems.

Megger MFT1721 Measurements

Voltage measurements: True RMS for more reliable voltage readings even on noisy circuits.

Insulation testing: Selectable test ranges 100V / 250V / 500V or 1kV. The Megger 1721 is also fully protected against live circuits.

RCD Type: Ability to test 10 / 30 / 100 / 300 / 500 and 1000mA RCD’s at ½, 1 and 5 times.

RCD Test: Auto test feature to save you time by not having to return to the tester when the RCD trips. Ramp test to determine at what current the RCD actually trips. Also tests Type B (pure DC) RCDs and 3 phase RCD (no earth).

Continuity and resistance: 200mA and 15mA test ranges with adjustable buzzer threshold.

Loop testing

  • 2 and 3 Wire Non-Tripping L-PE 50 V ~ 280 V
  • 2 Wire Hi Current L-N 50 V ~ 280 V
  • 2 Wire Phase to Phase L-L 50 V ~ 500 V
  • PSCC and PFC (20 kA max.)
  • Max. Zs Display
  • R1 + R2 Value

Megger MFT auto RCD test

The Megger 1721 has been designed to be as simple and comfortable to use for long periods of time. A TEST button features on both the right and left hand side, along with a large, central back lit screen. The 1721 is also a light weight tester at only 1kg when the batteries are fitted. A neck strap is also included.

Loop testing
Megger 2-wire no-trip test L-PE
Conventional 3-wire no-trip test L-PE-
New algorithm 3-wire no-trip test L-PE--
Confidence meter--
Max. Zs display
R1 + R2 value--
PSCC and PFC (20kA max.)
L-N/L-E 48V to 280V, 45 Hz to 65 Hz
L-N/L-E 48V to 480V, 45 Hz to 65 Hz-
Insulation testing
250V, 500V and 1kV test voltages
100V test voltage-
Adjustable buzzer threshold-
Continuity and resistance
200mA test current for certification
15mA test current to prolong battery life-
Auto start continuity test
Adjustable buzzer threshold
Voltage / Frequency and Phase Rotation
10V to 600V AC and DC
Frequency 15Hz to 400Hz
Phase Rotation-
RCD testing
10, 30, 100, 300, 500mA RCDs
1000mA RCDs-
High Speed auto RCD test
Ramp test for RCD fault finding
Type A, type AC and Type S RCDs
Programmable RCDs
Type B RCDs-
3 phase (no earth) RCDs-
Earth electrode resistance testing
Stakeless or clamp on testing**--
3-wire testing for fall of potential or 62% rule--
Attached rod technique 3-pole testing--
Option of 25V and 50V output--
Ground noise check--
Additional benefits
CAT IV 300V / CATIII 600V rated
Remote test probe-
Current measurement 0.1mA to 200A *--
On-board recharging--
On-board memory--
Bluetooth downloading from memory--
Hard plastic carry case
Large soft carry case--
Calibration certificate included

*Requires optional iClamp **Requires optional i and vClamp

Megger MFT1721 key features

  • 18th edition tester for single and three phase systems
  • 100V / 250V / 500V and 1000V insulation test ranges
  • 15mA and 200mA continuity ranges
  • 2 and 3 wire no trip loop testing
  • 2 wire high current loop test
  • 2 wire phase to phase loop test
  • PSCC and PFC measurement
  • Max. Zs reading
  • R1 + R2 value
  • Touch voltage display on faulty earth
  • 1/2, 1, 5 x I and ramp test
  • Auto RCD testing
  • RCD types: AC, A and S
  • Also tests B (pure DC) RCDs
  • 3 Phase RCD (no earth)
  • 10, 30, 100, 300, 500 and 1000mA RCD testing
  • True RMS voltage measurement
  • Phase rotation
  • Supply measurement
  • CAT IV 300V / CATIII 600V safety rated
  • Megger calibration certificate included
  • Supplied in hard carry case

What's included

  • Megger MFT1721 Multifunction Tester
  • 3 wire test lead set with probes and crocodile clips
  • Mains plug test lead
  • Batteries
  • Switched test probe for remote testing
  • Megger embroidered Neck strap
  • Hard carry case
  • Full user guide CD for MFT1721
  • Megger calibration certificate
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