HIOKI Insulation Tester IR4053

The Hioki IR4053 is a premium insulation resistance tester built specifically for photovoltaic systems. It lets you measure insulation while PV modules are live—no need to power down. Choose from five test voltages (50–1000 V), get fast results in 4 seconds, and rely on built-in safety features like automatic discharge and live-circuit warning. Rugged and portable, it’s ideal for solar installers, maintenance technicians, and field engineers.

• Designed for photovoltaic systems — measure insulation resistance while the PV module is generating power without needing to short circuits.
• Five selectable test voltages (50 / 125 / 250 / 500 / 1000 V) plus 1000 V DC open-circuit voltage check.
• Fast 4-second measurement display in PV mode, with standard insulation test mode in 1 second update intervals.
• Rugged, jobsite-ready design — drop proof from 1 m and built with comparator/indicator LEDs for quick pass/fail checks.
• Safety and reliability — CAT III 600 V rating; live circuit indicator and automatic electric discharge to protect users and equipment.