121075R4 - S&C Electric SM-4 50E 7.2kV Power Fuse Refill Unit

121075R4

121075R4 is an S&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.

• Catalog Number: 121075R4
• Manufacturer: S&C Electric
• Fuse Type: SM-4 Refill Unit
• Voltage Rating: 7.2 kV Nominal, 8.25 kV Maximum
• Amperage Rating: 50E
• Speed Curve: Standard
• Interrupt Rating: 15,600 amperes RMS symmetrical
• Current-Responsive Element: Silver or pretensioned nickel-chrome
• Construction: Solderless, brazed terminals
• Melting Current Tolerance: 10%
• Corrosion-Resistant Design

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Specifications

• Part Number: 121075R4
• Manufacturer : S&C Electric
• Brand : S&C Electric
• Category : Fuse
• Item Subcategory : Fuse Part And Accessory
• Section : Fuse Refills
• Family : SM-4
• Type : E
• Voltage : 17000
• Amperage : 200
• Mounting : Condenser

Product Data

• Weight : 1