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. 162-1430
Mfr. Part No.S20K140
BrandEPCOS
TWD12
Each (On a Reel of 250)
units
220V 140V 180V 360V 100A 78J Standard 21.5mm 8000A 1.24nF - - 4.8mm 21.5 (Dia.) x 4.8mm
RS Stock No. 289-7266
Mfr. Part No.B72220S0141K101
BrandEPCOS
TWD49
Each (In a Pack of 5)
units
220V 140V 180V 360V 100A 78J Standard 21.5mm 8000A 1.24nF - - 4.8mm 21.5 (Dia.) x 4.8mm
RS Stock No. 289-7553
Mfr. Part No.B72220S0140K101
BrandEPCOS
TWD54
Each (In a Pack of 5)
units
22V 14V 18V 43V 20A 12J Standard 21.5mm 2000A 19nF - - 4.6mm 21.5 (Dia.) x 4.6mm
New
RS Stock No. 170-2882
Mfr. Part No.S20K14
BrandEPCOS
TWD20
Each (On a Reel of 250)
units
22V 14V 18V 43V 20A 12J Standard 21.5mm 2000A 19nF - - 4.6mm 21.5 (Dia.) x 4.6mm
RS Stock No. 393-541
Mfr. Part No.VC32M00301KBA
BrandAVX
TWD81
Each (In a Pack of 5)
units
470V 300V 385V 775V 10A 23J VC32 - 400A 70pF 8.51mm 5.26mm 2.03mm 8.51 x 5.26 x 2.03mm
New
RS Stock No. 166-7871
Mfr. Part No.VC32M00301KBA
BrandAVX
TWD78,999
1 Reel of 1000
Reel(s)
470V 300V 385V 775V 10A 23J VC32 - 400A 70pF 8.51mm 5.26mm 2.03mm 8.51 x 5.26 x 2.03mm
RS Stock No. 226-8056
Mfr. Part No.ERZV07D471
BrandPanasonic
TWD12
Each (In a Pack of 5)
units
470V 300V 385V 775V 10A 42J ZNR 8.5mm 1750A 100pF - - 5.8mm 8.5 (Dia.) x 5.8mm
RS Stock No. 920-2804
Mfr. Part No.ERZV07D471
BrandPanasonic
TWD14,688
1 Bag of 2000
Bag(s)
- - - - - - - - - - - - - -
RS Stock No. 162-0183
Mfr. Part No.B72260B0271K001
BrandEPCOS
TWD2,635
Each (In a Box of 10)
units
430V 275V 350V 710V 500A 860J HighE - 70000A 6.6nF 100mm 100mm 24mm 100 x 100 x 24mm
RS Stock No. 813-3593
Mfr. Part No.B72260B0271K001
BrandEPCOS
TWD3,026
Each
units
430V 275V 350V 710V 500A 860J HighE - 70000A 6.6nF 100mm 100mm 24mm 100 x 100 x 24mm
RS Stock No. 720-9973
Mfr. Part No.ERZV14D391
BrandPanasonic
TWD16
Each (In a Pack of 5)
units
390V 250V 320V 650V 50A - ZNR 15.5mm 6000A 500pF - - - 15.5 (Dia.) x 5.8mm
RS Stock No. 110-1944
Mfr. Part No.ERZV14D391
BrandPanasonic
TWD8,200
1 Bag of 1000
Bag(s)
390V 250V 320V 650V - - ZNR - 6000A 500pF - - - 15.5 (Dia.) x 5.8mm
RS Stock No. 439-764
Mfr. Part No.ERZV14D391
BrandPanasonic
TWD21
Each (In a Pack of 10)
units
390V 250V 320V 650V 50A 140J - 15.5mm 6000A 500pF - - 5.8mm 15.5 (Dia.) x 5.8mm
RS Stock No. 106-9859
Mfr. Part No.ERZV05D330
BrandPanasonic
TWD2,700
1 Bag of 1000
Bag(s)
33V 20V 26V 73V - - ZNR - 250A 1.4nF - - - 7 (Dia.) x 4.5mm
RS Stock No. 110-1881
Mfr. Part No.ERZV07D471
BrandPanasonic
TWD4
Each (In a Bag of 500)
units
470V 300V 385V 775V - - ZNR - 1750A 100pF - - - 8.5 (Dia.) x 5.8mm
RS Stock No. 720-9737
Mfr. Part No.ERZV05D330
BrandPanasonic
TWD9
Each (In a Pack of 10)
units
33V 20V 26V 73V 1A 1.1J ZNR 7mm 250A 1.4nF - - 4.5mm 7 (Dia.) x 4.5mm
RS Stock No. 106-9913
Mfr. Part No.ERZV14D391
BrandPanasonic
TWD8,200
1 Bag of 1000
Bag(s)
390V 250V 320V 650V - - ZNR - 6000A 500pF - - - 15.5 (Dia.) x 5.8mm
RS Stock No. 110-1889
Mfr. Part No.ERZV05D330
BrandPanasonic
TWD3
Each (In a Bag of 1000)
units
33V 20V 26V 73V - - ZNR - 250A 1.4nF - - - 7 (Dia.) x 4.5mm
New
RS Stock No. 170-9997
Mfr. Part No.V250LA10P
BrandLittelfuse
TWD3,632
1 Bag of 1000
Bag(s)
429V 250V 330V 650V 25A 40J LA 12.5mm 2500A 220pF - - 5.6mm 12.5 (Dia.) x 5.6mm
RS Stock No. 800-7040
Mfr. Part No.V250LA10P
BrandLittelfuse
TWD13
Each (In a Pack of 10)
units
429V 250V 330V 650V 25A 40J LA 12.5mm 2500A 220pF - - 5.6mm 12.5 (Dia.) x 5.6mm