Megger MIT430/2 MIT Series Insulation Resistance Testers

Megger MIT430/2 is a CAT IV 600 V insulation and continuity tester from the MIT400 mk2 Series, designed for electrical installation testing and specialist applications requiring accurate, reliable, and safe measurements. This advanced model features Polarization Index (PI), Dielectric Absorption Ratio (DAR) functions, a variable test voltage range (VAR) , and Bluetooth® wireless data download capability.

The instrument features a redesigned rugged, over-moulded case with a back-stand and a 6-cell battery compartment with separate fuse access. It achieves an IP54 weatherproof rating, providing excellent protection against dust and water splashes.

Key Features

Feature Description

Insulation Testing Up to 1000 V and 200 GΩ range

Adjustable Test Voltage 10 V to 1000 V in 10 V steps (variable mode)

Fixed Test Voltages 50 V, 100 V, 250 V, 500 V, 1000 V

Stabilized Output Voltage maintained within +2% / -0% of selected range (industry standard is +20%)

Diagnostic Tests Polarization Index (PI) & Dielectric Absorption Ratio (DAR)

Continuity Testing Single auto-ranging from 0.01 Ω to 1 MΩ

Voltage Measurement 600 V TRMS AC and DC

Capacitance Measurement 0.1 nF to 10 μF

Frequency Measurement 15 Hz to 400 Hz

Live Circuit Detection Automatic detection and protection with test inhibit

Data Storage >1000 test results with onboard memory

Bluetooth® Wireless data download (Class II, range up to 10 m)

Display Dual digital readout with analog arc display

Backlight Yes, with illumination

IP Rating IP54 – Dust and water resistant

Safety Rating CAT IV 600 V / CAT III 1000 V

Technical Specifications

Insulation Testing

Parameter Specification

Test Voltages (Fixed) 50 V, 100 V, 250 V, 500 V, 1000 V

Variable Voltage Range 10 V to 1000 V (adjustable in 10 V steps)

Maximum Measurement 200 GΩ

Short Circuit Current 2 mA (typical)

Test Current 1 mA to 2 mA

Terminal Voltage Accuracy +2% / -0% of selected range

Guard Terminal Eliminates surface leakage currents

Continuity Testing

Parameter Specification

Measurement Range 0.01 Ω to 1 MΩ (auto-ranging)

Test Current Options 200 mA or 20 mA

Lead Null Up to 10 Ω

Voltage Measurement

Parameter Specification

DC Voltage Range 0 to 600 V

AC Voltage Range 10 mV to 600 V TRMS

Input Impedance 0.25 MΩ

Live Circuit Warning Activates for voltages >30 V

Capacitance Measurement

Parameter Specification

Measurement Range 1 nF to 10 μF

Accuracy ±5.0% ± 2 digits

Frequency Measurement

Parameter Specification

Measurement Range 15 Hz to 400 Hz

Accuracy ±0.5% ± 1 digit

General Specifications

Parameter Specification

Display Digital with analog arc display

Storage Capacity >1000 test results

Data Download Bluetooth® wireless (Class II, range up to 10 m)

Timer Control Countdown timer for timed tests

Power Supply 6 x 1.5 V AA (LR6) alkaline or 6 x 1.2 V NiMH rechargeable

Battery Life Approximately 3000 insulation tests (5 sec ON / 55 sec OFF @ 1000 V into 1 MΩ)

Charging Option 12-15 V DC (accessory interface, optional)

Fuse 500 mA (FF) 1000 V, 32 x 6 mm ceramic, HBC 30 kA min (NO glass fuses)