SPECIFICATION SHEET DIN-Rail Mount Semiconductor Fusing Protection for Your Solid State Power Controller For protection of solid state power controllers, such as Watlow’s DIN-A-MITE®, a semiconductor fuse is recommended to protect the power controller and ensure long life. To safeguard your power controllers, Watlow® offers DIN-rail, mount fuse holders and semiconductor fuses in various sizes to accommodate the entire DIN-A-MITE SCR power controller family and solid state relay products. These fuse holders feature lockout/tagout and open fuse indication. Fuse Fuse Holder Fuse Part Number Part Number Ferraz Shawmut ULTRASAFE USM1I 600 VOLT/ fuse holders Catalog Numbers and Descriptions - For use with 10 x 38 mm Fuses up to 30A US141I1 Pole with Indicator Note: All fuses should be rated at 125% of connected load or the next standard fuse size above 125 percent. Due to special cases such as cooler ambient or lower amperage loads, the connected load should be the determining factor. The semiconductor fuse i2t rating must not exceed the SCR I2t rating. Semiconductor fuses are classified as supplemental protection for semiconductor devices. They are not approved for branch circuit protection. Terminal screws: Phillips/slot head Suggested screw torque: 30A - 14.75 lbs.-in. Connector type: Pressure Plate Wire range: US14 #6 to #14 (solid/stranded Cu) Load-break disconnect: No Ferraz Shawmut ULTRASAFE US14 750 VOLT/ fuse holders Connector type: Pressure Plate Wire range: US14 #2 to #14 (solid/stranded Cu) Load-break disconnect: No 0.69 in. Terminal screws: Phillips/slot head (17.5 mm) Suggested screw torque: 50A - 35 lbs.-in. Catalog Numbers and Descriptions - For use with 14 x 51 mm Fuses up to 50A US141I1 Pole with Indicator Fuse and Fuse Holders Watlow Part Number 17-5110 0.87 in. (22 mm) Holder 17-5122 Watlow Part Number 17-5122 Watlow Part Number 17-5114 Watlow® and DIN-A-MITE® are registered trademarks of Watlow Electric Manufacturing Compa