121300R3 - S&C Electric SM-4 Medium Voltage Power Fuse 7200V 200A Class E

121300R3

121300R3 is an S&C Electric SM-4 medium-voltage power fuse designed for reliable overcurrent protection in outdoor distribution substations. This Class E rated fuse operates at 7200V AC with a 200-ampere continuous current rating and delivers fast, positive fault interruption through high-speed arc elongation in a solid-material-lined bore. The fuse features a silver or pretensioned nickel-chrome current-responsive fusible element with solderless, brazed construction, ensuring precise melting time-current characteristics with only 10% total tolerance in melting current. The SM-4 design includes an auxiliary bore that delays arc extinction for low-magnitude faults while enhancing deionizing gas generation for moderate-to-high faults, providing superior coordination with protective relays and other distribution equipment.

• Voltage Rating: 7200V AC nominal
• Current Rating: 200 amperes RMS symmetrical
• Fuse Type: SM-4 medium-voltage power fuse
• Class Rating: Class E
• Interrupting Rating: 15,600 amperes RMS symmetrical at 60 Hz
• Speed: Standard velocity operation
• Fusible Element: Silver or pretensioned nickel-chrome
• Construction: Solderless, brazed terminals
• Melting Current Tolerance: 10% total tolerance
• Arc Extinction: Solid-material-lined bore with deionizing gas generation
• Application: Transformer and capacitor bank protection in outdoor distribution
• Mounting: Complete factory-assembled and adjusted

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Specifications

• Part Number: 121300R3
• Manufacturer : S&C Electric
• Brand : S&C Electric
• Category : Fuse
• Item Subcategory : Medium Voltage
• Type : SM-4
• Voltage : 7200
• Amperage : 200
• Class Rating : E
• Velocity : Standard

Product Data

• Weight : 2