{"product_id":"121075r4-s-c-electric-sm-4-50e-7-2kv-power-fuse-refill-unit","title":"121075R4 - S\u0026C Electric SM-4 50E 7.2kV Power Fuse Refill Unit","description":" \t\t\t\t\t\t\t\t\t\t\u003ch2\u003e121075R4\u003c\/h2\u003e                                         \u003cbr\u003e \t\t\t\t\t\t\t\t\t\t\u003cb\u003e121075R4\u003c\/b\u003e is an S\u0026amp;C Electric SM-4 power fuse refill unit designed for medium-voltage power distribution systems. This standard-speed fuse delivers reliable fault interruption in outdoor and indoor distribution applications rated up to 7.2 kV nominal voltage.The 121075R4 features a 50-ampere rating with precision-engineered silver or pretensioned nickel-chrome current-responsive elements for consistent melting time-current characteristics. The SM-4 refill unit utilizes high-speed arc elongation in a solid-material-lined bore combined with efficient deionizing action to achieve fast, positive fault interruption. With only 10% total tolerance in melting current, this fuse delivers superior performance compared to standard alternatives. The nondamageable design ensures that age, vibration, and electrical surges do not affect its operating characteristics, eliminating the need for precautionary replacement of companion fuses.\u003cul\u003e\n\u003cli\u003eCatalog Number: 121075R4\u003c\/li\u003e\n\u003cli\u003eManufacturer: S\u0026amp;C Electric\u003c\/li\u003e\n\u003cli\u003eFuse Type: SM-4 Refill Unit\u003c\/li\u003e\n\u003cli\u003eVoltage Rating: 7.2 kV Nominal, 8.25 kV Maximum\u003c\/li\u003e\n\u003cli\u003eAmperage Rating: 50E\u003c\/li\u003e\n\u003cli\u003eSpeed Curve: Standard\u003c\/li\u003e\n\u003cli\u003eInterrupt Rating: 15,600 amperes RMS symmetrical\u003c\/li\u003e\n\u003cli\u003eCurrent-Responsive Element: Silver or pretensioned nickel-chrome\u003c\/li\u003e\n\u003cli\u003eConstruction: Solderless, brazed terminals\u003c\/li\u003e\n\u003cli\u003eMelting Current Tolerance: 10%\u003c\/li\u003e\n\u003cli\u003eCorrosion-Resistant Design\u003c\/li\u003e\n\u003c\/ul\u003eAt \u003cb\u003eEssential Parts\u003c\/b\u003e, we offer \u003cb\u003efast shipping\u003c\/b\u003e, \u003cb\u003elowest price\u003c\/b\u003e, and \u003cb\u003eexpert support\u003c\/b\u003e to help you get the right product every time. \t\t\t\t\t\t\t\t\t\t\u003cbr\u003e                                          \t\t\t\t\t\t\t\t\t\t\u003ch3\u003e\u003cb\u003eSpecifications\u003c\/b\u003e\u003c\/h3\u003e \t\t\t\t\t\t\t\t\t\t\u003cul\u003e \t\t\t\t\t\t\t\t\t\t\t\u003cli\u003ePart Number: 121075R4\u003c\/li\u003e                                             \u003cli\u003eManufacturer : S\u0026amp;C Electric\u003c\/li\u003e\n\u003cli\u003eBrand : S\u0026amp;C Electric\u003c\/li\u003e\n\u003cli\u003eCategory : Fuse\u003c\/li\u003e\n\u003cli\u003eItem Subcategory : Fuse Part And Accessory\u003c\/li\u003e\n\u003cli\u003eSection  : Fuse Refills\u003c\/li\u003e\n\u003cli\u003eFamily : SM-4\u003c\/li\u003e\n\u003cli\u003eType : E\u003c\/li\u003e\n\u003cli\u003eVoltage : 17000\u003c\/li\u003e\n\u003cli\u003eAmperage : 200\u003c\/li\u003e\n\u003cli\u003eMounting : Condenser\u003c\/li\u003e \t\t\t\t\t\t\t\t\t\t\u003c\/ul\u003e                                         \u003cbr\u003e                                         \u003ch3\u003e\u003cb\u003eProduct Data\u003c\/b\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eWeight : 1 \u003c\/li\u003e\u003c\/ul\u003e                                         \u003cbr\u003e                                          ","brand":"S\u0026C Electric","offers":[{"title":"New","offer_id":44914193662111,"sku":"121075R4-New","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0500\/2349\/7887\/files\/121075R4.png?v=1759513607","url":"https:\/\/essentialparts.com\/products\/121075r4-s-c-electric-sm-4-50e-7-2kv-power-fuse-refill-unit","provider":"Essential Electric Supply","version":"1.0","type":"link"}