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. 247-8562
Mfr. Part No.E3640
BrandMetrohm
SGD3,604.89
Each
units
Flash Tester 0V 4200V - LCD 5mA - -15°C +55°C Battery, Mains - - - -
RS Stock No. 123-3220
BrandRS PRO
SGD562.09
Each
units
Insulation Tester 50V 1000V 20GΩ Auto Backlit Analog Bar Graph Display - 1100 (times of insulation tests) 0°C +50°C Battery CAT IV 600V CAT IV 600V Alkaline
RS Stock No. 820-2964
Mfr. Part No.U1452A
SGD1,439.36
Each
units
Insulation Tester 50V 1000V 260GΩ LCD 1mA 270 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. 334-7201
Mfr. Part No.M540C
SGD1,250.52
Each
units
Insulation Tester 50V 1000V 400MΩ Analogue 200mA 3000 Tests (Carbon Zinc) 0°C +40°C Battery CAT II 1000V CAT II 1000V D
RS Stock No. 620-4084
Mfr. Part No.MIT330-EN
BrandMegger
SGD1,283.67
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. 122-6796
Mfr. Part No.1004-741
BrandMegger
SGD1,705.34
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. 535-3185
Mfr. Part No.MIT220-EN
BrandMegger
SGD793.46
Each
units
Insulation & Continuity Tester 250V 500V dc 999MΩ LCD 200mA 3000 5-Second Tests -10°C +55°C Battery CAT III 300V CAT III 300V AA
RS Stock No. 914-2885
Mfr. Part No.P01140834
SGD1,281.79
Each
units
Insulation & Continuity Tester 10V 500V 50GΩ Digital 200mA 3000 Measurements, 6000 Measurements -20°C +55°C Battery CAT IV 600V CAT IV 600V AA
RS Stock No. 302-9587
Mfr. Part No.MJ 15
BrandMegger
SGD3,935.69
Each
units
Insulation Tester 500V 5000V 20GΩ Analogue 1mA 2000 5-Second Tests -20°C +50°C Battery CAT I, CAT III 300 V, 600 V CAT I 600 V, CAT III 300V AA
RS Stock No. 516-7704
Mfr. Part No.MIT310A-EN
BrandMegger
SGD995.92
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. 820-2973
Mfr. Part No.U1453A
SGD1,837.46
Each
units
Insulation Tester 50V 1000V 260GΩ LCD 1mA 160 h -40°C +55°C Battery CAT III, CAT IV 600 V, 1000 V CAT III 1000 V, CAT IV 600V AA
RS Stock No. 867-5630
Mfr. Part No.M550T
SGD2,397.64
Each
units
Insulation Tester 100V 5000V 100GΩ Analogue 1mA - 0°C +40°C Battery CAT II, CAT III, CAT IV 300 V, 600 V, 1000 V CAT II 1000 V, CAT III 600 V, CAT IV 300V D
RS Stock No. 620-4062
Mfr. Part No.MIT320-FR
BrandMegger
SGD1,156.69
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. 914-2879
Mfr. Part No.P01140824
SGD943.46
Each
units
Insulation & Continuity Tester 50V 1000V 200GΩ Backlit Digital LCD, Backlit LCD 200mA 1500 Measurements, 3000 Measurements -20°C +55°C Battery CAT IV 600V CAT IV 600V AA
RS Stock No. 867-5621
Mfr. Part No.M550P
SGD1,618.33
Each
units
Insulation Tester 50V 1000V 199GΩ Analogue, Digital ≤5mA - -10°C +50°C Battery CAT II, CAT III, CAT IV 300 V, 600 V, 1000 V CAT II 1000 V, CAT III 600 V, CAT IV 300V AA
RS Stock No. 914-2875
Mfr. Part No.P01140822
SGD829.83
Each
units
Insulation & Continuity Tester 250V 1000V 40GΩ Backlit Digital LCD, Backlit LCD 200mA 1500 Measurements, 3000 Measurements -20°C +55°C Battery CAT IV 600V CAT IV 600V AA
RS Stock No. 914-2888
Mfr. Part No.P01140826
SGD1,046.76
Each
units
Insulation & Continuity Tester 50V 1000V 200GΩ Backlit Digital LCD, Backlit LCD 200mA 1500 Measurements, 3000 Measurements -20°C +55°C Battery CAT IV 600V CAT IV 600V AA
RS Stock No. 820-2976
Mfr. Part No.U1461A
SGD1,754.29
Each
units
Insulation Tester 50V 1000V 260GΩ OLED 1mA 160 h -40°C +55°C Battery CAT III, CAT IV 600 V, 1000 V CAT III 1000 V, CAT IV 600V AA
RS Stock No. 877-7118
Mfr. Part No.IM75
BrandFLIR
SGD1,041.52
Each
units
Insulation Tester 50V 1000V 20GΩ LCD - - 0°C +50°C Battery CAT III, CAT IV 600 V, 1000 V CAT III 1000 V, CAT IV 600V 6 x AAA
RS Stock No. 705-1957
Mfr. Part No.FLUKE 1550C
BrandFluke
SGD7,786.00
Each
units
Insulation Tester 250V 5000V 1TΩ LCD 1 nA → 2 mA 750 Tests -20°C +50°C Battery CAT III, CAT IV 600 V, 1000 V CAT III 1000 V, CAT IV 600V Rechargeable Lead Acid (Yuasa NP2.8-12)