Range = Protistor 시리즈 = MS 3V Micro-switch for 690 V square body Protistor® fuses. Fuse melt changeover micro-switch, activated by the fuse striker with manual reset (MS 3 V 1.5) or automatic reset (MS 4 L 2.5). Screws straight onto the 690 V square Protistor® fuse body. UL approved.