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Megger MFT1721-BS Installation Tester
  • Megger MFT1721-BS Installation Tester
  • Megger MFT1721 Installation Tester
  • Megger MFT1721 Installation Tester

Megger MFT1721-BS Installation Tester

Megger approved distributor and service centre.

Includes: MFT 1721, SP5 Switched probe, full user guide on CD, Calibration certificate, Neck strap - Megger embroidered, 3 Wire lead set with prods and clips, Mains plug test lead, batteries and calibration cert.

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As well as providing all of the facilities needed for testing low-voltage single-phase installations in line with the IET Wiring Regulations, this innovative instrument can also check phase sequence, evaluate prospective short-circuit current up to 20 kA, perform phase-to-phase loop testing at 415 V, and test three-phase RCDs even when no neutral connection is available.

Additionally, the Megger MFT1721, which is one of the new models in Megger’s popular and successful MFT1700 range, offers valuable extra features, including: true RMS voltage measurement, facilities for testing the Type B RCDs and a millivolt sensor input. It also features fast-response continuity testing at 200 mA or 15 mA and, with an optional current clamp accessory, it can be used to measure current.

Like all instruments in the new MFT1701 range, the MFT1721 provides three options for loop testing – two-wire no trip, three-wire no trip and high current – which means that the fastest and most convenient method can be used in every situation.


Three-phase installation tester.megger mft1721 rotary range switch
2 and 3-wire non-trip loop impedance testing.
Fast 2-wire high current loop test including phase to phase testing ability.
ZMAX facility.
Full range of RCD tests from 10 mA to 1000 mA.
Selective, variable, type B and 3-phase RCD (no neutral), testing.
Auto RCD and ramp test.
Insulation testing at 1 kV, 500 V, 250 V and 100 V.
Continuity and low Ws at 200 and 15 mA.
Adjustable buzzer threshold.
True RMS voltage measurement and phase rotation.

Megger Multifunction Tester Animation

Megger MFT1721 Specifications
Insulation Test
Insulation ranges 100 V, 250 V, 500 V, 1000 V.
Adjustable buzzer threshold
Output voltage -0% +20% at rated load or less.
Voltage Display ±3% ±3 digits ±0.5% of rated voltage.
Short Circuit Current 1.5 mA nominal test current.
Test Current on Load 1 mA at min pass values of insulation.
Insulation Accuracy
1000 V 10 kΩ to 999 MΩ (±3% ± 2 digits).
500 V 10 kΩ to 500 MΩ (±3% ± 2 digits)
>500 MΩ (±10% ± 4 digits).
250 V 10 kΩ to 250 Ω (±3% ± 2 digits)
>250 MΩ (±10% ± 4 digits).
100 V 10 kΩ to 100 MΩ (±3% ± 2 digits)
>100 MΩ (±10% ± 4 digits).
Resistance and Continuity
Adjustable buzzer threshold
Range and Accuracy 0.01 to 99.9 Ω (±2% ± 2 digits)
100 to 99.9 kΩ (±5% ± 2 digits).
Open Circuit Voltage 5V ± 1V.
Test Current (0 to 2 Ω) 205 mA ±5 mA
15 mA ±5 mA (user selectable).
Loop Test
Live to Earth/Neutral Supply 48 to 280 V (45 to 65 Hz).
Live to Live Supply (Not Available on MFT1711) 48 to 500 V (45 to 65 Hz).
L-N/L-L Tests ±5% ±5 digits.
L-E Tests 0.1 to 39.9 Ω (±5% ±5 digits ± noise margin)
40 Ω to 1000 Ω (±10% ± 5 digits).
Display Range 0.01 to 1000 Ω.
Live to Earth PFC Range 20 kA.
Live to Live PSCC Range 20 kA.
RCD Test
Supply up to 100 mA 48 to 480 V (45 to 65 Hz).
Supply up to 1 A 48V to 280V.
RCD Type Type AC, A and S
Type B (Pure DC).
No-Trip Test (½xI) -10 to -0%.
Trip Test (1xI, 2xI and 5xI) +0 to +10%.
Ramp Test Touch Voltage (0 to 253 V) ±5% +15% ±0.5 V.
Trip Time ±1% ±1 ms.
Trip Current ±5%.
Step Increments
VAR (Variable RCD Selection)
10 mA to 50 mA 1 mA steps.
50 mA to 500 mA 5 mA steps.
500 mA to 1000 mA 10 mA steps.
Supply Measurement
Voltage 10 V to 600 V (15 to 400 Hz) True RMS.
Voltage Accuracy ±3% ±1 V ±2 digits.
Phase Rotation Indication L1-L2-L3 and L1-L3-L2.
Frequency 15 Hz to 99 Hz (±0.5% ±1 digit).
Frequency Resolution 0.1 Hz.
General Specifications
Safety IEC 61010-1: 2010
IEC 61010-30: 2010
IEC 61010-031: 2008
600V CAT III / CAT IV 300V (Max phase to phase 600V)
IEC 61557: 2007 parts 1 to 10.
Power IEC LR6 type AA alkaline batteries.
EMC IEC61326 edition 2 location class B.
Operating Temperature Range -10 to +55°C .
IP Rating IP54.
Dimensions (Instrument and Case) 150 x 85 x 235 mm (H x W x D).
Weight (Instrument and Case) 1 kg (with batteries).
Megger MFT1721 warranty 1 year extendable to 3 years.


Megger MFT1701 Series

PDF Specifications of the Megger MFT1711, MFT1721, MFT1731 Installation Testers.

Download (193.32k)
Software PowerSuite Lite. 1000-631
Lead set
Fused 10 A test lead set (red/blue/green) with
prods and clips.
ETL30 Extension Test Lead 30 m. 1000-215
ETL50 Extension Test Lead 50 m. 1000-217
SP5 Switched Probe (silicone). 1001-687
ICLAMP Current measuring clamp. 1001-012
VCLAMP Voltage inducing clamp, calibration check pcb
(for stakeless test) and lead.
Pouch Test and carry pouch. 1006-408
Soft pouch Large soft pouch with extra storage. 1007-463
Strap Neck strap - Megger embroidered. 2001-509

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