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. 289-7351
Mfr. Part No.B72220S0551K101
BrandEPCOS
TWD48.00
Each (In a Pack of 5)
units
910V 550V 745V 1500V 100A 210J Standard 21.5mm 6500A 320pF - - 7.5mm 21.5 (Dia.) x 7.5mm
RS Stock No. 775-2742
Mfr. Part No.B72510E0110K062
BrandEPCOS
TWD7.00
Each (In a Pack of 100)
units
16.2 → 19.8V 11V 14V 35V 1A 0.2J - - 120A 400pF 2mm 1.25mm - 2 x 1.25 x 1.4mm
RS Stock No. 721-0049
Mfr. Part No.ERZV20D431
BrandPanasonic
TWD49.50
Each (In a Pack of 2)
units
430V 275V 350V 710V 100A - ZNR 21.5mm 10000A - - - - 21.5 (Dia.) x 6.4mm
RS Stock No. 106-9931
Mfr. Part No.ERZV20D431
BrandPanasonic
TWD29.20
Each (In a Bag of 1000)
units
430V 275V 350V 710V - - ZNR - 10000A - - - - 21.5 (Dia.) x 6.4mm
RS Stock No. 110-1943
Mfr. Part No.ERZV14D471
BrandPanasonic
TWD10.20
Each (In a Bag of 1000)
units
470V 300V 385V 775V - - ZNR - 6000A 400pF - - - 15.5 (Dia.) x 6.2mm
RS Stock No. 170-9904
Mfr. Part No.V130LA20AP
BrandLittelfuse
TWD10.60
Each (In a Bag of 500)
units
228V 130V 175V 340V 100A 70J LA 23mm 6500A 1.9nF - - 5.6mm 23 (Dia.) x 5.6mm
RS Stock No. 170-9966
Mfr. Part No.V24ZA50P
BrandLittelfuse
TWD10.60
Each (In a Bag of 500)
units
19.2 → 26V 14V 18V 43V 20A 100J ZA 23mm 2000A 18nF - - 5mm 23 (Dia.) x 5mm
RS Stock No. 316-5964
Mfr. Part No.TNR10V471K
TWD35.40
Each (In a Pack of 5)
units
470V 300V 385V 775V 25A 60J - 11.5mm 3500A 220pF - - 6.2mm 11.5 (Dia.) x 6.2mm
RS Stock No. 289-7272
Mfr. Part No.B72220S0151K101
BrandEPCOS
TWD24.00
Each (In a Pack of 5)
units
240V 150V 200V 395V 100A 85J Standard 21.5mm 8000A 1.16nF - - 4.9mm 21.5 (Dia.) x 4.9mm
RS Stock No. 721-0033
Mfr. Part No.ERZV20D331
BrandPanasonic
TWD53.00
Each (In a Pack of 2)
units
330V 210V 270V 545V 100A 228J ZNR 21.5mm 10000A 1.1nF - - 5.9mm 21.5 (Dia.) x 5.9mm
RS Stock No. 170-9909
Mfr. Part No.V150LA20AP
BrandLittelfuse
TWD10.60
Each (In a Bag of 500)
units
268V 150V 200V 395V 100A 80J LA 23mm 6500A 1.6nF - - 5.6mm 23 (Dia.) x 5.6mm
RS Stock No. 878-1303
Mfr. Part No.V271DA40
BrandLittelfuse
TWD1,210.80
Each (In a Pack of 12)
units
473V 275V 369V 730V - - DA - 40000A 4.5nF 62mm - - 62 x 67 x 15mm
RS Stock No. 878-1732
Mfr. Part No.V571DA40
BrandLittelfuse
TWD1,610.00
Each
units
1001V 575V 730V 1480V - - DA - 40000A 2.2nF 62mm - - 62 x 67 x 15mm
RS Stock No. 106-9930
Mfr. Part No.ERZV20D391
BrandPanasonic
TWD28.00
Each (In a Bag of 1000)
units
390V 250V 320V 650V - - ZNR - 10000A 1.1nF - - - 21.5 (Dia.) x 6.2mm
RS Stock No. 760-6927
Mfr. Part No.V24ZA50P
BrandLittelfuse
TWD21.00
Each (In a Pack of 5)
units
19.2 → 26V 14V 18V 43V 20A 100J ZA 23mm 2000A 18nF - - 5mm 23 (Dia.) x 5mm
RS Stock No. 170-2869
Mfr. Part No.B72220S0171K101
BrandEPCOS
TWD18.80
Each (On a Reel of 250)
units
270V 175V 225V 455V 100A 98J Standard 21.5mm 8000A 1nF - - 5mm 21.5 (Dia.) x 5mm
RS Stock No. 106-9916
Mfr. Part No.ERZV20D180
BrandPanasonic
TWD25.00
Each (In a Bag of 1000)
units
18V 11V 14V 36V - - ZNR - 3000A 40nF - - - 21.5 (Dia.) x 5.1mm
RS Stock No. 785-8761
Mfr. Part No.ERZE07A511
BrandPanasonic
TWD5.80
Each (In a Pack of 25)
units
510V 320V 410V 845V 25A 70J ZNR 9mm 2500A 140pF - - 7mm 9 x 7mm
RS Stock No. 878-1722
Mfr. Part No.V131DA40
BrandLittelfuse
TWD1,309.00
Each
units
225.5V 130V 175V 345V - - DA - 40000A 10nF 62mm - - 62 x 67 x 15mm
RS Stock No. 167-0540
Mfr. Part No.B72660M0250K072
BrandEPCOS
TWD29.30
Each (On a Reel of 1000)
units
39V 25Vrms 31V 77V 2.5A - CU - 250A 1.4nF 10.2mm 8mm 3.2mm 10.2 x 8 x 3.2mm