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. 167-8513
Mfr. Part No.B72240B0321K001
BrandEPCOS
TWD865.70
Each (In a Box of 10)
units
510V 320V 420V 840V 300A 640J HighE - 40000A 2.3nF 60mm 14mm - -
RS Stock No. 720-9813
Mfr. Part No.ERZV07D151
BrandPanasonic
TWD6.00
Each (In a Pack of 10)
units
150V 95V 125V 250V 10A 13J ZNR 8.5mm 1750A 500pF - - 4.8mm 8.5 (Dia.) x 4.8mm
RS Stock No. 785-8871
Mfr. Part No.ERZE10A911
BrandPanasonic
TWD7.40
Each (In a Pack of 25)
units
910V 550V 745V 1500V 10A 168J ZNR 12.5mm 4500A 220pF - - 9.5mm 12.5 (Dia.) x 9.5mm
RS Stock No. 851-8417
Mfr. Part No.MOV-20D911K
BrandBourns
TWD18.00
Each
units
910V - 745V 1500V 100A 282J MOV-20D 23mm - 440pF - - 8.2mm 23 (Dia.) x 8.2mm
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. 876-8158
Mfr. Part No.V131HB34
BrandLittelfuse
TWD254.00
Each
units
184.5V 130V 175V 205V - - HB34 - 40000A 10nF 37mm - - 37 x 47.5 x 5.7mm
RS Stock No. 760-7030
Mfr. Part No.V480LA80BP
BrandLittelfuse
TWD38.40
Each (In a Pack of 5)
units
670 → 790V 480V 640V 1160V 100A 180J LA 23mm 6500A 550pF - - 7.3mm 23 (Dia.) x 7.3mm
RS Stock No. 170-9984
Mfr. Part No.V480LA80BP
BrandLittelfuse
TWD13.20
Each (In a Bag of 400)
units
670 → 790V 480V 640V 1160V 100A 180J LA 23mm 6500A 550pF - - 7.3mm 23 (Dia.) x 7.3mm
RS Stock No. 167-0170
Mfr. Part No.B72510E0110K062
BrandEPCOS
TWD5.20
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 170-2874
Mfr. Part No.B72220S0551K101
BrandEPCOS
TWD33.40
Each (On a Reel of 200)
units
910V 550V 745V 1500V 100A 210J Standard 21.5mm 6500A 320pF - - 7.5mm 21.5 (Dia.) x 7.5mm
RS Stock No. 769-1969
Mfr. Part No.ETFV25K275E4
BrandEPCOS
TWD190.20
Each (In a Pack of 5)
units
430V 275Vrms 350V 710V 150A 375J B72214T - 20000A 945pF 30.2mm 35.2mm 11.2mm 30.2 x 35.2 x 11.2mm
RS Stock No. 110-1950
Mfr. Part No.ERZV20D390
BrandPanasonic
TWD25.80
Each (In a Bag of 1000)
units
39V 25V 31V 77V - - ZNR - 3000A 13.8nF - - - 21.5 (Dia.) x 5.5mm
RS Stock No. 266-5390
Mfr. Part No.B72240B0271K001
BrandEPCOS
TWD936.00
Each
units
430V 275V 350V 710V 300A 550J HighE - 40000A 2.7nF 60mm 14mm - -
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. 204-2208
Mfr. Part No.B72220S0271K101
BrandEPCOS
TWD19.20
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. 204-2078
Mfr. Part No.B72207S0301K101
BrandEPCOS
TWD8.80
Each (In a Pack of 5)
units
470V 300V 385V 775V 10A 23J Standard 9mm 1200A 90pF - - 4.5mm 9 (Dia.) x 4.5mm
RS Stock No. 289-7317
Mfr. Part No.B72220S0301K101
BrandEPCOS
TWD22.40
Each (In a Pack of 5)
units
470V 300V 385V 775V 100A 173J Standard 21.5mm 8000A 580pF - - 5.6mm 21.5 (Dia.) x 5.6mm
RS Stock No. 110-1961
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. 167-8504
Mfr. Part No.B72240B0271K001
BrandEPCOS
TWD865.60
Each (In a Box of 10)
units
430V 275V 350V 710V 300A 550J HighE - 40000A 2.7nF 60mm 14mm - -
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