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. 240-078
Mfr. Part No.DVS240
$44.41
Each
units
240V 275V 350V - - 264J DVS - 6500A - 75mm 52.5mm 12.5mm 75 x 52.5 x 12.5mm
RS Stock No. 240-040
Mfr. Part No.DVS024
$47.20
Each
units
24V 30V 38V - - 8.8J DVS - 1000A - 75mm 52.5mm 12.5mm 75 x 52.5 x 12.5mm
RS Stock No. 707-9801
Mfr. Part No.DVSB275652TNS
$273.19
Each
units
- 275V 350V - - - DVSB - 50000A - 36mm 70mm 90mm 36 x 70 x 90mm
RS Stock No. 707-9797
Mfr. Part No.DVSC275452TT
$174.90
Each
units
275V 275V 350V - - - DVSC - 45000A - 36mm 72mm 90mm 36 x 72 x 90mm
RS Stock No. 240-062
Mfr. Part No.DVS110
$81.99
Each
units
- 150V 200V - - 80J DVS - 6500A - 75mm 52.5mm 12.5mm 75 x 52.5 x 12.5mm
RS Stock No. 707-9781
Mfr. Part No.DVSC275452TNS
$185.32
Each
units
- 275V 350V - - - DVSC - 45000A - 36mm 72mm 90mm 36 x 72 x 90mm