MIT400 Series CAT IV
Insulation Resistance and Continuity Testers

Insulation testing up to 1000 V and 200 GΩ,
Continuity testing at 200 mA or 20 mA down to 0.01 mA

Megger MIT400 series, Insulation Testers
cart Call for price ►► | MIT400 |MIT410 | MIT430 | MIT480 |
| MIT481 | MIT485 | MIT40X |


  • Insulation testing up to 1000 V and 200 GΩ
  • Patented analog arc and dual digital display
  • CAT IV 600 V rating
  • TRMS & DC Voltage measurement
  • Continuity testing at 200 mA or 20 mA down to 0.01
  • Pass/Fail limit alarms
  • PI/DAR and Timer function
  • IIII [+] Read More
    • Test result storage (MIT Models 420, 430, 481 and 485
    • Bluetooth® wireless data transfer (MIT Models 430 and 485
    • Measurement of capacitance and distance by capacitance (MIT Models 481 and 485)
    • User selectable test voltage in 1V increments from 10V to 100V (MIT Model 40X)
    • Three year product warranty
    • IP54 rated


    • Plant maintenance and production testing
    • Panelboard testing
    • Railway and other transportation maintenance and testing
    • Motor testing
    • Cable inspection/quality control
    • Street lighting maintenance
    • Avionics ground testing and maintenance
    • Military hardware and facility maintenance
    • Commercial avionics testing
    • Military land, marine and air communications testing
    • Manufacturing/production line testing
    • Electrostatic test and measurement
    • Component testing
    • Battery powered traction and lifting equipment testing


The Megger MIT400 Series insulation and continuity testers has been designed for electrical testing by power utilities, industrials, telecommunication companies, commercial/domestic electricians and anyone with unique test voltage requirements. The wide range of features also makes the MIT400 Series ideal for maintenance technicians and engineer.

IIII [+] Read More

Meggers’ new MIT400 series insulation testers are rugged and compact enough for one-handed operation. They fully meet the requirements for Cat IV 600V applications, as defined by IEC61010, ensuring safe operation in all normal electrical, service, maintenance and utility applications.
All models in the MIT400 range offer time saving fast-response continuity testing and true RMS voltage measurement that provides accurate results even when the supply waveform is non-sinusoidal.
For general applications, Megger offers the MIT400 tester in four versions.
The entry level MIT400 provides insulation testing at 250V, 500V and 1,000V, together with continuity testing and voltage measurement. The MIT410 adds 50V and 100 V insulation tests, as well as fully automatic measurement of dielectric absorption (DAR) and polarisation index (PI), while the MIT420 provides all of the facilities of the MIT420 plus internal storage for test results. Stored results can subsequently be recalled to the screen to allow easy recording.
The versatile MIT430, stores test results and also allows them to be transferred to a PC via a Bluetooth wireless connection. This arrangement completely eliminates the need for data cables, and also guarantees total electrical isolation between the instrument and the PC to which the data is being transferred.
The low-voltage model MIT40X has a selectable insulation test voltage from 10V up to 100V, and three further models which are optimized for use in telecommunications applications.
All Megger MIT400-series instruments have a removable rubber over-moulding for added resilience, and all are supplied in the form of a kit, complete with test leads and a strong moulded carrying case. For added convenience and ease of use, the instruments can be stored in the case without disconnecting the test leads.
All models also feature a useful dual digital display plus and analog arc. The display shows the main parameter being measured, while the smaller secondary display shows related parameter s- for example, insulation test voltage – as a digital value. Users therefore save valuable time by measuring two parameters with a single test.

    Designed to be exceptionally safe to use, fast detecting circuitry prevents damage to the instruments if accidentally connected to live circuits or across phases. Specifically, all instruments:
  • Meet the international requirements of IEC1010-2 and EN61557.
  • Live circuit detection inhibits insulation testing on circuits over 50V.
  • Live circuit detection and test inhibit on continuity measurements.
  • Default display of live circuit voltage on all ranges.
  • Detection and inhibit functions even if the protection fuse has failed.
  • Suitable for use on CAT IV applications and supply voltages to 600 V. 600 V CAT IV
    All MIT400 instruments are designed to meet the safety requirements for use on CAT IV 600 V.
  • Literature
  • Specifications
  • Selection Table
Literature and Technical Information
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Digital Oscilloscopes

++ MIT400 Series Specification Brochure | 1.6 MB
Model: MEGGER MIT400 Series
Model Nominal test voltages
MIT400 250 V, 500 V, 1000 V
MIT410, 420, 430 50 V, 100 V, 250 V, 500 V, 1000 V
MIT480 50 V, 100 V
MIT481, 485 50 V, 100 V, 250 V, 500 V, 1000 V
MIT40X 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, and 100 kHz. (autoranging
Model Insulation resistance range
MIT400 20 GΩ
MIT410 100 GΩ
MIT420, 430 200 GΩ
MIT480 100 GΩ
MIT481, 485 200 GΩ
MIT40X 20 GΩ
Model Range Full Scale Accuracy
1000 volts ±3% ±2 digits ±0.2% per GΩ
500 volts ±3% ±2 digits ±0.4% per GΩ
250 volts ±3% ±2 digits ±0.8% per GΩ
100 volts ±3% ±2 digits ±2.0% per GΩ
50 volts ±3% ±2 digits ±4.0% per GΩ
25 volts ±3% ±2 digits ±2.0% per 100 MΩ
Analog range: 1 GΩ full scale
Short Circuit Current: 2 mA +0% -50%
Leakage Current: 10% ±3 digits
Voltage display: 3% ±3 digits ±0.5% of rated voltage
Polarization Index (PI): 10 min/1 minute ratio
Dielectric Absorption Ratio (DAR): 60 sec/30 sec ratio
Measurement: 0.01 Ω to 99.9 Ω (0 to 100 Ω on analog scale)
Accuracy: ±3% ±2 digits (0 to 100 Ω)
Open circuit voltage: 5 V ±1 V
Test current: 200 mA (–0 mA +20 mA)
(0.01 Ω to 9.99 Ω)
(±1 mA )
(10.0 Ω to 99.9 Ω)
Zero offset at probe tips: 0.10Ω typical
Lead resistance zeroing: Up to 9.00 Ω
Buzzer: Variable limit 1Ω, 2Ω, 5Ω, 10Ω, 20Ω
Measurement: 0.01 kΩ to 1000 kΩ (0 to 1 MΩ on analog scale)
Accuracy: ±3% ±2 digits
Open circuit voltage: 5 V ±1 V
Frequency: 40 – 450 Hz (40 Hz – 99.9 Hz) ±0.5% ±1 digit (100 Hz to 450 Hz)
Voltage range: 0 to 600 V d.c. ±2% ±2 digits
10 mV to 600 V TRMS sinusoidal (40 to 400 Hz) ±2% ±2 digits
0 to 1000 V on Analog scale
Unspecified input level 0 – 10 mV (40 to 400 Hz)
For non-sinusoidal waveforms additional specification apply: ±3% ±2 digits 101 mV to 600 V TRMS and ±8% ±2 digits 10 mV to 100 mV TRMS
Default Voltmeter: Operates at >25 V a.c. or d.c. on any range except OFF
Frequency: 40 – 450 Hz (40 Hz – 99.9 Hz) ±0.5% ±1 digit (100 Hz to 450 Hz)
Capacitance Measurement: MIT420, MIT430, MIT481 and MIT485
Measurement range: 100 pF to 10 μF
Accuracy: ± 5.0% ±2 digits
Distance by capacitance: MIT481 and MIT485
Arithmetic conversion from capacitance measurement on
Default capacitance measurement: 50 nF/m
Capacitance range: 40 nF/m to 60 nF/m
Warm-up Time: Approx. 30 minute
Power supply: 5 x 1.5 V cells type IEC LR6 (AA, MN1500, HP7, AM3 R6HP) Alkaline NiMH rechargeable cells may be used.
Battery life: 2200 insulation tests with duty cycle of 5 sec ON /55 sec OFF @ 1000 V into 1 MΩ

Use only a 500 mA (FF) 1000 V 32 x 6 mm ceramic fuse of high breaking capacity HBC 50 kA minimum. Glass fuses MUST NOT be fitted.

Operating Temperature: -10 to +55° C, 90% RH at 40° C max.
Storage Temperature: -25 to +70° C
Dimensions: Instrument: 220 x 92 x 50 mm (8.66 in. x 3.63 in. x 1.97 in.)
Instrument and case: 456 x 178 x 89 mm (18 in. x 7 in. x 3.5 in.)
Weight: Instrument only: 590 gms (20.73 oz.), 775 gms (27.22 oz.) with boot
Instrument and case: 1.75kg (3.86 lb)
Battery backup: Setup parameters are backed up with a lithium battery.
Dust and water protection: IP54 Protected against dust and splashing water
Safety Protection: The instruments meet EN 61010-1 (1995) to 600 V phase to earth, Category IV. Refer to safety warnings supplied.
  Service & Telco Special Applications
Insulation Voltage Range MIT400 MIT410 MIT420 MIT430 MIT440X
10-100 V variable
(2 GΩ – 20GΩ)
50 V    
100 V    
250 V  
500 V  
1000 V  
Upper Insulation resistance
Insulation Range 20 GΩ >100 GΩ 200 GΩ 200 GΩ 2-20 GΩ
Leakage Current Display  
INS Test Voltage Display
(0.01 to 200 ohms)
Variable current limit. 200mA/20 mA
Fast buzzer – selectable threshold
KΩ range to 999 KΩ  
Live circuit warning
at 50 V
Default voltmeter
TRMS measurement
to 600 V
Measurement Ranges
Frequency  –
40 Hz to 400 Hz
(0.1 nF to 10 µF)
(0.1 to 19.99 V)
Battery condition display
Insulation Timed –
PI – DAR Tests
Test button plus
lock button
Limit alarm pass
band on INS
Auto power down  
Switch Probe (supplied)    
Calcert with product  
Data Storage
Bluetooth Downloading        
Storage only