Insulation Testers

Insulation testers are electrical measurement test tools used for preventative or predictive maintenance programs. Also known as megohmmeters they are designed to identify potential equipment failures before they occur. Insulation resistance testers are perfect for testing a wide range of high voltage equipment including switchgear, motors, generators and cables.

RS Components offer a range of high-quality electrical test tools from leading brands including Megger, Fluke, Chauvin Arnoux, Keysight Technologies, Metrohm, FLIR and of course RS PRO.

We also offer an in-house calibration service. See here for more details calibration services

Insulation tester types

Insulation testers are handheld devices but can be portable with a handle or bench mounted. Testers usually have an LCD or digital display, but some have the more traditional analogue needle such as the Megger MIT310A.

How do insulation resistance testers work?

Testing the integrity of insulation requires measuring its resistance to current flow across it. Testers use high voltage low current DC charge to measure the resistance. A high level of resistance means that very little current is escaping through the insulation. Conversely, a low level of resistance indicates a significant amount of current may be leaking through and along the insulation.

What is the purpose of insulation testing?

Ideally, all the electrical current sent along a conductive wire should reach its intended destination. However, you do find that some of it is lost along the way due to various reasons. Wires are insulated with a resistant sheathing to contain the conductivity of the copper or aluminium core, but even with this insulation in place, some of the current still manages to escape. The electricity that leaks out can be detrimental to electrical circuits and machinery.

Testing can help you determine whether the insulation is performing at an effective and safe level. Excessive heat or cold, moisture, vibration, dirt, oil and corrosive vapours can all contribute to deterioration therefore routine testing can identify problems before they result in injury or equipment failure.

Insulation testers provide noise-free, reliable results. They are safe and easy to use and the ideal solution for troubleshooting, commissioning and preventative maintenance applications.


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Description Price Tester Type Minimum Test Voltage Maximum Test Voltage Maximum Insulation Resistance Measurement Display Type Test Current Battery Life Minimum Operating Temperature Maximum Operating Temperature Power Source Safety Category Level Safety Category Voltage Safety Category Battery Type
RS Stock No. 518-6008
Mfr. Part No.FLUKE 1507
BrandFluke
MYR3,909.00
Each
units
Insulation Tester 50V 1000V 10GΩ - 200mA - -20°C +55°C Battery CAT III, CAT IV 600V CAT III 600 V, CAT IV 600V AA
RS Stock No. 516-7681
Mfr. Part No.MIT300-EN
BrandMegger
MYR3,139.07
Each
units
Insulation & Continuity Tester 250V 500V dc 999MΩ LCD 1mA 5000 5-Second Tests -10°C +60°C Battery CAT III 600V CAT III 600V AA
RS Stock No. 914-5420
Mfr. Part No.2491945
BrandFluke
MYR4,842.71
Each
units
Insulation Tester 50V 1000V 2GΩ Digital 1mA 1000 h -20°C +55°C Battery CAT III, CAT IV 600 V, 1000 V CAT III 1000 V, CAT IV 600V AA
RS Stock No. 518-5998
Mfr. Part No.FLUKE 1503
BrandFluke
MYR3,250.00
Each
units
Insulation Tester 500V 1000V 2GΩ Graphic Display - Backlit 200mA - -20°C +55°C Battery CAT III, CAT IV 600V CAT III 600 V, CAT IV 600V AA
RS Stock No. 516-7697
Mfr. Part No.MIT310-EN
BrandMegger
MYR3,644.35
Each
units
Insulation & Continuity Tester 250V 1000V dc 999MΩ LCD 1mA 5000 5-Second Tests -10°C +60°C Battery CAT III 600V CAT III 600V AA
RS Stock No. 763-9267
Mfr. Part No.1001-935
BrandMegger
MYR17,256.61
Each
units
Insulation Tester 250V 5000V 10TΩ LCD 6mA 6 h -20°C +50°C Battery, Mains - - CAT IV 600V Lithium-Ion
RS Stock No. 763-9260
Mfr. Part No.1001-939
BrandMegger
MYR20,759.83
Each
units
Insulation Tester 250V 5000V 10TΩ LCD 6mA 6 h -20°C +50°C Battery, Mains - - CAT IV 600V Lithium-Ion
RS Stock No. 122-6798
Mfr. Part No.1004-745
BrandMegger
MYR5,949.10
Each
units
Insulation Tester 50V 2500V 200GΩ - - 3000 5-Second Tests - - Battery CAT IV - - AA
RS Stock No. 535-3191
Mfr. Part No.MIT230-EN
BrandMegger
MYR3,051.64
Each
units
Insulation & Continuity Tester 250V 1000V dc 999MΩ LCD 200mA 3000 5-Second Tests -10°C +55°C Battery CAT III 300V CAT III 300V AA
RS Stock No. 620-4084
Mfr. Part No.MIT330-EN
BrandMegger
MYR4,422.15
Each
units
Insulation & Continuity Tester 250V dc 1000V dc 999MΩ Digital 1mA 5000 5-Second Tests -10°C +60°C Battery CAT III 600V CAT III 600V AA
RS Stock No. 921-4520
Mfr. Part No.1006-749
BrandMegger
MYR5,127.54
Each
units
Insulation Tester 10V 1000V 200GΩ Analogue, Dual Digital 205mA 2200 (OFF) Test @ 55 s, 2200 (ON) Test @ 5 s -20°C +55°C Battery CAT IV 600V CAT IV 600V Alkaline
RS Stock No. 122-6797
Mfr. Part No.1004-742
BrandMegger
MYR5,776.42
Each
units
Insulation Tester 50V 500V 200GΩ Digital 20 mA @ 10.0 Ω → 99.9 Ω, 205 mA @ 0.01 Ω → 9.99 Ω 2200 5-Second Tests -20°C +55°C Battery CAT IV 600V CAT IV 600V Alkaline, NiMH
RS Stock No. 763-9264
Mfr. Part No.1001-946 (UK) 1001-945 (EU)
BrandMegger
MYR25,503.92
Each
units
Insulation Tester 500V 10000V 20TΩ LCD 6mA 4.5 h -20°C +50°C Battery, Mains - - CAT IV 600V Li-ion
RS Stock No. 512-2492
Mfr. Part No.FLUKE-1577
BrandFluke
MYR4,453.00
Each
units
Insulation Tester 500V 1000V 2GΩ - 1mA 1000 h -20°C +55°C Battery CAT III, CAT IV 600 V, 1000 V CAT III 1000 V, CAT IV 600V AA
RS Stock No. 122-6800
Mfr. Part No.1004-742
BrandMegger
MYR5,776.42
Each
units
Insulation Tester 50V 1000V 100GΩ Digital 20 mA @ 10.0 Ω → 99.9 Ω, 205 mA @ 0.01 Ω → 9.99 Ω 2200 5-Second Tests -20°C +55°C Battery CAT IV 600V CAT IV 600V Alkaline, NiMH
RS Stock No. 516-7704
Mfr. Part No.MIT310A-EN
BrandMegger
MYR3,210.28
Each
units
Insulation & Continuity Tester 250V 1000V dc 999MΩ Analogue 1mA 5000 5-Second Tests -10°C +60°C Battery CAT III 600V CAT III 600 V AA
RS Stock No. 516-7710
Mfr. Part No.MIT320-EN
BrandMegger
MYR3,959.94
Each
units
Insulation & Continuity Tester 250V 1000V dc 999MΩ LCD 1mA 5000 5-Second Tests -10°C +60°C Battery CAT III 600V CAT III 600V AA
RS Stock No. 921-4526
Mfr. Part No.1004-739
BrandMegger
MYR3,327.06
Each
units
Insulation Tester 10V 1000V 200GΩ Analogue, Dual Digital 205mA 2200 (OFF) Test @ 55 s, 2200 (ON) Test @ 5 s -20°C +55°C Battery CAT IV 600V CAT IV 600V Alkaline
RS Stock No. 122-6801
Mfr. Part No.1006-767
BrandMegger
MYR5,776.18
Each
units
Insulation Tester 50V 2500V 200GΩ - - 3000 5-Second Tests - - Battery CAT IV - - AA
RS Stock No. 122-6796
Mfr. Part No.1004-741
BrandMegger
MYR5,231.47
Each
units
Insulation Tester 50V 500V 200GΩ Digital 20 mA @ 10.0 Ω → 99.9 Ω, 205 mA @ 0.01 Ω → 9.99 Ω 2200 5-Second Tests -20°C +55°C Battery CAT IV 600V CAT IV 600V Alkaline, NiMH