Hioki IR4056-20 Insulation Tester UAE | 1000 V

Description

Hioki IR4056-20 Insulation Tester Overview

The Hioki IR4056-20 is a 5-range digital insulation resistance tester for electricians, testing and commissioning engineers, and maintenance teams. It tests at 50 V, 125 V, 250 V, 500 V and 1000 V, up to 4000 MΩ. It also has a 200 mA continuity test for protective conductors and a built-in AC/DC voltmeter up to 600 V.

Its comparator gives a clear PASS/FAIL result in about 0.8 s, with a buzzer and LCD light. It is rated CAT III 600 V, IP40 and drop proof to 1 m, so it suits switchboards, cables, motors and solar PV systems.

Key Features

5 test voltages: 50 / 125 / 250 / 500 / 1000 V DC
Up to 4000 MΩ at 1000 V; ±2% rdg. ±2 dgt. in the 1st effective range
200 mA low-resistance test for earth and protective conductors (IEC 60364) and EV/HEV
AC/DC voltage up to 600 V with automatic AC/DC detection
PASS/FAIL comparator with approx. 0.8 s response
Live circuit indicator and automatic discharge for safer testing
White LED backlit display for dim locations
CAT III 600 V, IP40, 1 m drop proof

Hioki IR4056-20 Specifications

Hioki IR4056-20 official specifications
Test voltages / max indicated value	50 V / 100 MΩ, 125 V / 250 MΩ, 250 V / 500 MΩ, 500 V / 2000 MΩ, 1000 V / 4000 MΩ
Insulation accuracy (1st effective range)	±2% rdg. ±2 dgt.: 0.200-10.00 MΩ (50 V), 0.200-25.0 MΩ (125 V), 0.200-50.0 MΩ (250 V), 0.200-500 MΩ (500 V), 0.200-1000 MΩ (1000 V)
Lower limit resistance	0.05 / 0.125 / 0.25 / 0.5 / 1 MΩ (50 / 125 / 250 / 500 / 1000 V)
DC voltage	4.2 V to 600 V, 4 ranges; ±1.3% rdg. ±4 dgt.
AC voltage	420 V / 600 V, 2 ranges, 50/60 Hz; ±2.3% rdg. ±8 dgt. (average rectifier)
Low resistance / continuity	10 Ω to 1000 Ω, 3 ranges; ±3% rdg. ±2 dgt.; test current 200 mA or more (at 6 Ω or less)
PASS/FAIL response	Approx. 0.8 s (comparator)
Other functions	Live circuit indicator, automatic discharge, automatic DC/AC detection, comparator, auto power save
Display	Semi-transmissive FSTN LCD with white LED backlight
Safety / ruggedness	CAT III 600 V; IP40; drop proof 1 m onto concrete
Power	4 × LR6 (AA) alkaline batteries; approx. 20 h continuous use, approx. 1000 measurements (Hioki test conditions)
Dimensions / weight	159 W × 177 H × 53 D mm; approx. 600 g (with batteries, without test leads)
Included accessories	L9787 test lead, neck strap, instruction manual, 4 × LR6 (AA) batteries
Warranty	3-year product warranty; accuracy guaranteed for 1 year

IR4056-20 vs IR4056-21

Hioki IR4056 model comparison
IR4056-20	Standard L9787 test lead (1.2 m, with alligator clip)
IR4056-21	L9788-11 test lead set with remote switch, LED lamp and PASS/FAIL indicator on the lead

If you test many circuits in a row, the Hioki IR4056-21 lets you start the test and see the result at your hand. Spare leads: the Hioki L9787 test lead. For a faster 0.3 s comparator, see the Hioki IR4057-50. Other options include the Hioki IR4053.

Typical Applications

Insulation testing of cables, switchboards and distribution boards
Motors, generators and transformers
Earth and protective conductor continuity on new installations
Solar PV systems (voltage checks and insulation tests)
EV and HEV continuity checks
Low-voltage tests on control and telecom wiring (50 V / 125 V)

Testing Tips

Isolate the circuit and confirm it is dead first. The built-in voltmeter and live circuit indicator help here. Pick the test voltage for the equipment’s rating, and let the tester discharge the circuit before you remove the leads. For help choosing, read our guide on how to choose the best insulation tester and our guide to electrical safety standards and CAT ratings.

Need help choosing the right model or a quotation? Message our team on WhatsApp or use the quote button on this page.

Browse all insulation resistance testers or more Hioki products.

Hioki IR4056-20 FAQ

What test voltages does the Hioki IR4056-20 offer?

Five: 50 V, 125 V, 250 V, 500 V and 1000 V DC, with maximum indicated values of 100 MΩ, 250 MΩ, 500 MΩ, 2000 MΩ and 4000 MΩ.

What is the difference between the IR4056-20 and IR4056-21?

The meter is the same. The IR4056-20 comes with the L9787 test lead. The IR4056-21 comes with the L9788-11 test lead set with remote switch and LED lamp, which also shows the PASS/FAIL result at your hand.

Can the IR4056-20 check earth and protective conductor continuity?

Yes. Its low-resistance function tests with 200 mA or more, as used for protective conductor checks in building installations (IEC 60364) and for EV/HEV continuity checks.

Does it measure voltage too?

Yes. It measures DC voltage up to 600 V and AC voltage up to 600 V, and detects AC or DC automatically. That makes it useful on solar PV systems and before starting an insulation test.

How fast is the PASS/FAIL comparator?

About 0.8 seconds. For faster 0.3 s decisions, look at the Hioki IR4057 series.

What batteries does the IR4056-20 use?

Four LR6 (AA) alkaline batteries. Hioki rates continuous use at about 20 hours under its test conditions.

Is the IR4056-20 rugged enough for site work?

Yes. It is rated CAT III 600 V and IP40, and it is drop proof to 1 m onto concrete. Its white LED backlight helps in dark panels.

What warranty does Hioki give?

Hioki gives a 3-year product warranty, with accuracy guaranteed for 1 year.

Specifications

Specification	Details
Test voltages	50, 125, 250, 500, 1000 V DC (5 ranges)
Effective maximum indicated value (250 V DC)	500 MΩ; accuracy ±2% rdg.
Lower limit resistance (250 V DC)	0.25 MΩ
Overload protection (250 V DC)	600 V AC (10 s)
DC voltage range	4.2 V to 600 V, 4 ranges; accuracy ±1.3% rdg.
AC voltage range	420 V, 2 ranges; accuracy ±2.3% rdg.
Continuity	Continuity check function
Power supply	AA alkaline (LR6) batteries ×4
Dimensions	159 (W) × 177 (H) × 53 (D) mm
Mass	Approx. 600 g

Datasheet

Download datasheetPDF

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1 review for Hioki IR4056-20 Insulation Tester

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jade – November 23, 2025

Rated 5 out of 5
Reliable, accurate, and built tough — the IR4056-20 makes insulation testing fast and worry-free on every job.

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