Epcos, S07K320, MOV, B72207S321K101, 1000pcs, Datasheet

Datasheet PDF: http://bit.ly/TDK_EPCOS_MOV
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EPCOS Metal Oxide Varistors (MOV) Unlike the fuse or circuit breaker which offers over-current protection, the varistor provides over-voltage protection by means of voltage-clamping in a similar way to the zener diode.The word “Varistor” is a combination of the words VARI-able resi-STOR used to describe their mode of operation way back in their early days of development which is a little misleading since a varistor can not be manually varied like a potentiometer or rheostat.

About the MOV – Metal Oxide Varistors

A MOV contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides (such as small amounts of bismuth, cobalt, manganese) sandwiched between two metal plates (the electrodes).