V250LA40BP TVS Varistor, MOV, 250 V, 330 V, LA Series, 620 V, Disc 20mm. The LA Varistor Series of transient voltage surge suppressors are radial leaded varistors (MOVs) that are designed to be operated continuously across AC power lines. These UL recognised varistors require very little mounting space, and are offered in various standard lead form options.