Portable insulation resistance meter MIT series

benchtopfor electric motors

Overview
Perform essential insulation tests quickly and accurately on motors, transformers, cables and other electrical assets. The range includes two models: MIT515 (up to 5 kV) and MIT1015 (up to 10 kV). These instruments support insulation resistance, dielectric absorption ratio (DAR), and polarisation index (PI) testing. The Essential range is simple to use, CAT IV 600 V rated, and built for demanding industrial, OEM and utility applications.

Key features

• PI Predictor™ estimates PI values in minutes and can reduce PI test duration by up to 50% for improved productivity.
• RE>Act™ test mode (patent applied) monitors reabsorption current to provide accurate measurements and to avoid incorrect pass/fail results and dangerous return voltages.
• Stable, accurate results with 3 mA noise immunity for consistent performance in typical industrial or distribution-level sites up to 45 kV.
• Fixed 3 mA burn/charge current; no onboard data storage (designed for simple go/no-go testing where internal memory is not required).
• High-performance guard terminal to ensure measurement accuracy in high-leakage conditions.
• Robust casing and IP65 protection (lid closed) for knocks, dust and harsh environments.
• Operator safety: CAT IV 600 V rated, live circuit detection and locking terminals.

Test modes

• Insulation Resistance (IR)
• Dielectric Absorption Ratio (DAR)
• Polarisation Index (PI)

Models and differences

• MIT515 — maximum output voltage up to 5 kV.
• MIT1015 — maximum output voltage up to 10 kV.
• Both models share the same features and test modes; the only difference is maximum output voltage.

Applications
Routine insulation testing on motors, transformers, cables and other electrical assets for industrial, utility and OEM environments where dependable, straightforward testing is required.

Product documentation (available)

• Data sheet (English)
• User guide (English)
• Application notes on RE>Act, PI Predictor and related guidance

FAQ highlights

• Megger offers three ranges: Essential (simple, no internal storage), Advanced (additional modes and storage), and Expert (for noisy environments, high burn current or remote testing).
• Essential instruments do not include internal memory or data export; choose Advanced or Expert for storage and communication features.
• Once you have chosen a range, select the required test voltage (5 kV or 10 kV).

Technical specifications

• Brand: Megger
• Model(s): MIT515, MIT1015
• Test modes: Insulation Resistance (IR), Dielectric Absorption Ratio (DAR), Polarisation Index (PI)
• PI Predictor™: reduces PI test time (estimates PI values)
• RE>Act™: monitors reabsorption current to ensure accurate pass/fail decisions and prevent dangerous return voltages
• Burn/charge current: fixed 3 mA
• Noise immunity: 3 mA (supports sites up to 45 kV)
• Guard terminal: high-performance guard for high-leakage conditions
• Ingress protection: IP65 (lid closed)
• Safety rating: CAT IV 600 V; live circuit detection; locking terminals
• Onboard storage: none (no internal memory or direct data export on Essential models)
• Maximum output voltage: MIT515 up to 5 kV; MIT1015 up to 10 kV