The DV 115 K 3225 from Bourns is a Medium Voltage Varistor that has been intended for protecting electronic equipment against high voltage surges in the medium voltage region.  It has an AC voltage rating of 115 V (RMS), a DC voltage rating of 150 V, and a clamping voltage of 300 V. This varistor provides superior transient energy absorption due to its improved energy volume distribution and power dissipation. It is packaged in a leadless chip design offering zero inductance to facilitate very fast response time to transient surges. This varistor is available in a surface-mount package that measures 8 x 6.3 x 2 mm.