Mersen UltraSafe modular 600 volt fuse holders for Class J fuses introduce a new level of safety and ease for installing or replacing Class J fuses. UltraSafe holders qualify as "finger-safe" to an IP20 grade of protection under IEC standards. The US3J accommodates 30A Class J or 22mm by 58mm French Ferrule fuses. UltraSafe holders are available in compact 2 pole unit with blown-fuse indicators in each pole. Multi-pole units can also be made up in the field by using the multiple-pole Assembly Kits. All units have provisions for locking in the open position for safety during fuse change outs or equipment servicing. US3J holder can be snap-mounted to 35mm DIN-rail and they have a unique latch which will stay open to allow re-positioning of the holder in the future. UltraSafe body material is tough and durable polyamide. Holder not UL listed when installed with French Ferrule fuses. Applications: 600 volt motors, transformers, lighting, heating, control circuits, general loads and non-load disconnect. UL Listed, guide IZLT File E52283; CSA Certified C22.2, class 6225 01, File 32169 and IEC certified 60269-1, 60947-3.