Megger MFT1721 Multifunction Tester

Megger MFT1721 Multifunction Tester

The Megger MFT1721, a mid-range 18th edition multifunction tester from Megger, excels in testing both single and three-phase installations found in various settings including domestic, industrial, and commercial environments. Additionally, each unit in the 17XX series, including the MFT1721, features a Max. Zs function, simplifying the process of testing final ring circuits efficiently.

Emphasizing the renowned Megger build quality, every Multifunction Tester is engineered for durability. It withstands harsh conditions such as drops, bounces, rain exposure, and even remains resilient when connected across phases or to a live circuit while locked on. Moreover, this robustness is complemented by a 3-year warranty (with product registration), ensuring complete peace of mind. The MFT1721 also boasts an IP54 rating, protecting it against dust and moisture.

Comparing the MFT1711 and MFT1721 reveals that the MFT1721 is tailored for engineers needing broader testing capabilities in their daily work. The following features come standard with the Megger MFT1721:

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

These additional features effectively ‘future-proof’ the device, minimizing the likelihood of encountering untestable installation parts. For instance, a 100V insulation range and 15mA continuity test are ideal for inductive loads or power conservation. Type B RCD testing is particularly beneficial for solar PV installations and three-phase systems.

MFT1721 Measurements

In the realm of measurements, the Megger MFT1721 offers:

• True RMS voltage measurements for more reliable readings on noisy circuits.
• Insulation testing with selectable test ranges (100V / 250V / 500V or 1kV), fully protected against live circuits.
• RCD Type testing with the ability to test various RCDs at different multiples.
• An RCD Test feature with an auto test to save time, a ramp test to determine actual RCD trip currents, and compatibility with Type B RCDs and 3 phase RCD (no earth).
• Continuity and resistance testing with 200mA and 15mA test ranges, and an adjustable buzzer threshold.

Finally, the MFT1721 provides comprehensive loop testing capabilities, including 2 and 3 Wire Non-Tripping L-PE, 2 Wire Hi Current L-N, and 2 Wire Phase to Phase L-L testing, along with PSCC, PFC, Max. Zs Display, and R1 + R2 Value measurement.

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

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

*Requires optional iClamp **Requires optional i and vClamp

Max. Zs test Megger MFT

Megger MFT auto RCD test

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