Hioki IR4057-50 Insulation Tester

• 5 test voltages: 50 V to 1000 V
• Insulation resistance up to 4000 MΩ
• Digital display with bar graph
• PASS/FAIL comparator with fast evaluation
• Protective conductor (PE) test with 200 mA in accordance with EN 61557-4
• CAT III 600 V safety rating
• Operating temperature range –25 °C to +65 °C
• Bluetooth communication via optional Z3210

Applications

• Installation and maintenance of low-voltage electrical systems
• Troubleshooting insulation faults in wiring, motors and equipment
• Field testing of machinery, control panels and distribution boards
• Periodic inspection of plant and equipment

The Hioki IR4057-50 is a battery-powered insulation tester designed for installation, service and maintenance of electrical systems. It provides five test voltages from 50 V to 1000 V and measures insulation resistance up to 4000 MΩ. The instrument is used for testing electrical installations, motors, machinery and control systems.

The digital display is complemented by a bar graph that provides immediate visual indication of insulation resistance during measurement. The integrated PASS/FAIL comparator evaluates results in approximately 0.3 seconds with both audible and visual indication. In case of a FAIL result, the display backlight turns red. Threshold values can be set individually for each test voltage range and are retained in the instrument.

With the comparator function disabled, the instrument displays the insulation resistance value after 60 seconds during an ongoing measurement. This supports time-based evaluation when longer test durations are required.

Protective conductor (PE) testing is performed with a 200 mA test current in accordance with EN 61557-4, enabling detection of poor connections, oxidized contacts and increased resistance. The instrument also includes AC and DC voltage measurement up to 600 V, allowing verification that the test object is not live before starting an insulation test.

The IR4057-50 is rated CAT III 600 V and has been drop tested to 1 m. It is specified for operation in ambient temperatures from –25 °C to +65 °C. The integrated hard case forms part of the instrument and provides storage space for test leads and accessories, which can remain connected during transport. The high-contrast display with backlight ensures clear readability in varying lighting conditions.

With the optional Z3210 wireless adapter, measurement data can be transferred via Bluetooth to the GENNECT Cross app. An optional test lead with integrated remote trigger and LED illumination allows measurements to be started directly from the probe.