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 Material Series Diameter Maximum Surge Current Capacitance Length Depth Thickness
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 Metal B72214T 14mm 20000A 945pF 30.2mm 35.2mm 11.2mm
RS Stock No. 170-2874
Mfr. Part No.B72220S0551K101
BrandEPCOS
TWD33.90
Each (On a Reel of 200)
units
910V 550V 745V 1500V 100A 210J Metal Standard 21.5mm 6500A 320pF - - 7.5mm
RS Stock No. 204-2208
Mfr. Part No.B72220S0271K101
BrandEPCOS
TWD34.80
Each (In a Pack of 5)
units
430V 275V 350V 710V 100A 151J Metal B72220 21.5mm 8000A 630pF - 2.3mm 5.4mm
RS Stock No. 167-0170
Mfr. Part No.B72510E0110K062
BrandEPCOS
TWD4.90
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 720-9998
Mfr. Part No.ERZV20D390
BrandPanasonic
TWD48.50
Each (In a Pack of 2)
units
39V 25V 31V 77V 20A 28J - V 21.5mm 3000A 13.8nF 44.5mm - 5.5mm
RS Stock No. 289-7317
Mfr. Part No.B72220S0301K101
BrandEPCOS
TWD23.60
Each (In a Pack of 5)
units
470V 300V 385V 775V 100A 173J Metal Standard 21.5mm 8000A 780pF - - 5.6mm
RS Stock No. 785-8913
Mfr. Part No.ERZE11A471
BrandPanasonic
TWD12.20
Each (In a Pack of 25)
units
470V 300V 385V 775V 50A 175J - V 13mm 6000A 360pF 37mm - 6.6mm
RS Stock No. 110-1961
Mfr. Part No.ERZV20D431
BrandPanasonic
TWD29.70
Each (In a Bag of 1000)
units
430V 275V 350V 710V 100A 303J - V 21.5mm 10000A 1nF 44.5mm - 6.4mm
RS Stock No. 775-2742
Mfr. Part No.B72510E0110K062
BrandEPCOS
TWD7.50
Each (In a Pack of 100)
units
16.2 → 19.8V 11V 14V 35V 1A 0.2J Ceramic Automative E - 120A 400pF 2mm 1.25mm -
RS Stock No. 110-1950
Mfr. Part No.ERZV20D390
BrandPanasonic
TWD22.20
Each (In a Bag of 1000)
units
39V 25V 31V 77V 20A - - V 21.5mm 3000A 13.8nF 44.5mm - 5.5mm
RS Stock No. 289-7351
Mfr. Part No.B72220S0551K101
BrandEPCOS
TWD61.60
Each (In a Pack of 5)
units
910V 550V 745V 1500V 100A 210J Metal Standard 21.5mm 6500A 410pF - - 7.5mm
RS Stock No. 697-9062
Mfr. Part No.VC120614D300DP
BrandAVX
TWD10.90
Each (In a Pack of 10)
units
18.5V 10V 14V 32V 1A 0.4J Ceramic - - 150A 1.05nF 3.2mm 1.6mm -
RS Stock No. 167-6923
Mfr. Part No.VC120614D300DP
BrandAVX
TWD5.30
Each (On a Reel of 1000)
units
18.5V 10V 14V 32V 1A 0.4J Ceramic - - 150A 1.05nF 3.2mm 1.6mm -
RS Stock No. 170-9984
Mfr. Part No.V480LA80BP
BrandLittelfuse
TWD25.10
Each (In a Bag of 400)
units
670 → 790V 480V 640V 1160V 100A 180J Metal LA 23mm 6500A 550pF 40.5mm - 7.3mm
RS Stock No. 167-8504
Mfr. Part No.B72240B0271K001
BrandEPCOS
TWD849.70
Each (In a Box of 10)
units
430V 275V 350V 710V 300A 550J Metal HighE 40mm 40000A 2.7nF 60mm 14mm 14mm
RS Stock No. 760-7030
Mfr. Part No.V480LA80BP
BrandLittelfuse
TWD39.80
Each (In a Pack of 5)
units
670 → 790V 480V 640V 1160V 100A 180J Metal LA 23mm 6500A 550pF 40.5mm - 7.3mm
RS Stock No. 204-2078
Mfr. Part No.B72207S0301K101
BrandEPCOS
TWD17.20
Each (In a Pack of 5)
units
470V 300V 385V 775V 10A 23J Metal Standard 9mm 1200A 100pF - - 4.5mm
RS Stock No. 266-5390
Mfr. Part No.B72240B0271K001
BrandEPCOS
TWD918.00
Each
units
430V 275V 350V 710V 300A 550J Metal HighE 40mm 40000A 2.7nF 60mm 14mm 14mm
RS Stock No. 876-8158
Mfr. Part No.V131HB34
BrandLittelfuse
TWD305.00
Each
units
184.5V 130V 175V 205V - 270J Metal HB34 - 40000A 10nF 37mm - 5.7mm
RS Stock No. 106-9930
Mfr. Part No.ERZV20D391
BrandPanasonic
TWD29.70
Each (In a Bag of 1000)
units
390V 250V 320V 650V 100A 275J - V 21.5mm 10000A 1.1nF 34.5mm - 6.2mm