Metal Oxide Varistors

What are they?
Metal Oxide Varistors, more commonly known as ’MOVs’ are devices that provide excellent transient voltage suppression. They are a type of non-linear device that feature similar characteristics to Zener diodes. They are used to protect vulnerable electronic circuits and components from overvoltage conditions that can cause damage. Any potentially destructive overvoltage energy is dissipated as heat.
Construction:
Metal oxide varistors are typically constructed from zinc oxide and combined with small additions of other metal oxides such as cobalt, magnese or bismuth. These materials are sintered into ceramic casings during manufacture. Although MOVs are available in different formats, they are most commonly radial leaded discs.
Applications:
• Suppression of lightning and other high levels of transient energy
• Low voltage power supplies in DC circuits
• Low voltage power supply in automotive applications
• Protection from internal transients within capacitor discharges, relay switching and inductive load switching

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Description Price Varistor Voltage Maximum AC Voltage Rating Maximum DC Voltage Rating Clamping Voltage Clamping Current Energy Series Diameter Maximum Surge Current Capacitance Length Depth Thickness Dimensions
RS Stock No. 240-157
BrandRS PRO
£8.14
Each
Units
710V 484V 640V 1200V - 380J High Power 36mm 12000A 1.94nF - - 6mm 36 (Dia.) x 6mm
RS Stock No. 240-129
BrandRS PRO
£10.58
Each
Units
400V 275V 370V 680V - 215J High Power 36mm 12000A 2.28nF - - 4mm 36 (Dia.) x 4mm
RS Stock No. 240-179
BrandRS PRO
£13.37
Each
Units
400V 275V 370V 680V - 180J High Power 32mm 10000A 1.9nF - - 4mm 32 (Dia.) x 4mm
RS Stock No. 240-113
BrandRS PRO
£6.07
Each
Units
360V 250V 330V 620V - 190J High Power 36mm 12000A 3.085nF - - 4mm 36 (Dia.) x 4mm
RS Stock No. 240-141
BrandRS PRO
£10.09
Each
Units
670V 460V 615V 1140V - 350J High Power 36mm 12000A 2.05nF - - 6mm 36 (Dia.) x 6mm
RS Stock No. 240-236
BrandRS PRO
£31.92
Each
Units
- 275V 365V - - 360J High Power - - - 61mm 50mm 40mm 61 x 50 x 40mm
RS Stock No. 901-2692
BrandRS PRO
£0.916
Each (In a Bag of 5)
Units
510V 320V 420V 840V - 136J - 17.5mm 6000A 370pF 22mm - 10.5mm 17.5 (Dia.) x 10.5mm
RS Stock No. 240-242
BrandRS PRO
£37.30
Each
Units
- 460V 605V - - 500J High Power - - - 61mm 50mm 40mm 61 x 50 x 40mm
RS Stock No. 240-214
BrandRS PRO
£13.35
Each
Units
- 132V 175V 360V - 200J High Power - - - 61mm 50mm 40mm 61 x 50 x 40mm
RS Stock No. 240-208
BrandRS PRO
£13.35
Each
Units
710V 484V 640V 1200V - 320J High Power 32mm 10000A 1.62nF - - 6mm 32 (Dia.) x 6mm
RS Stock No. 901-2743
BrandRS PRO
£2.65
Each
Units
510V 320V 420V 865V - 528J - - 22000A 1.75nF 29mm 29mm 11.8mm 29 x 35.5 x 11.8mm
RS Stock No. 240-135
BrandRS PRO
£12.84
Each
Units
610V 420V 560V 1050V - 310J High Power 36mm 12000A 2.05nF - - 5.5mm 36 (Dia.) x 5.5mm
RS Stock No. 901-2724
BrandRS PRO
£2.88
Each
Units
430V 275V 370V 710V - 370J - 28.5mm 18000A 1.39nF 35.5mm - 9.2mm 28.5 (Dia.) x 9.2mm
RS Stock No. 901-2734
BrandRS PRO
£2.65
Each
Units
430V 275V 370V 710V - 463J - - 22000A 2.13nF 29mm 29mm 11.4mm 29 x 35.5 x 11.4mm
RS Stock No. 240-185
BrandRS PRO
£16.45
Each
Units
610V 420V 560V 1050V - 260J High Power 32mm 10000A 1.71nF - - 5.5mm 32 (Dia.) x 5.5mm
RS Stock No. 204-2208
Mfr. Part No.B72220S0271K101
BrandEPCOS
£0.716
Each (In a Pack of 5)
Units
430V 275V 350V 710V 100A 151J B72220 21.5mm 8000A 630pF - - 5.4mm 21.5 (Dia.) x 5.4mm
RS Stock No. 240-078
Mfr. Part No.DVS240
£32.20
Each
Units
240V 275V 350V - - 264J DVS - 6500A - 75mm 52.5mm 12.5mm 75 x 52.5 x 12.5mm
RS Stock No. 204-1902
Mfr. Part No.B72214S0140K101
BrandEPCOS
£0.392
Each (In a Pack of 5)
Units
22V 14V 18V 43V 10A 4J Standard 15.5mm 1000A 9.95nF - - 4.2mm 15.5 (Dia.) x 4.2mm
RS Stock No. 289-7064
Mfr. Part No.B72210S0251K101
BrandEPCOS
£0.402
Each (In a Pack of 5)
Units
390V 250V 320V 650V 25A 38J Standard 12mm 2500A 215pF - - 4.8mm 12 (Dia.) x 4.8mm
RS Stock No. 170-9914
Mfr. Part No.V275LA40AP
BrandLittelfuse
£0.274
Each (In a Bag of 500)
Units
473V 275V 369V 710V 100A 140J LA 23mm 6500A 900pF - - 5.6mm 23 (Dia.) x 5.6mm
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