131500R3 - S&C Electric SM-5 300A 7.2kV Power Fuse Refill Unit

131500R3

131500R3 is an S&C Electric SM-5 power fuse refill unit designed for medium-voltage distribution and substation applications. This fuse refill unit is rated 300 amperes continuous at 7.2 kV nominal and provides fast, positive fault interruption through high-speed arc elongation and efficient deionizing action. The SM-5 series utilizes precision-engineered fusible elements with time-current characteristics that ensure dependable performance and reliable system coordination. The fuse operates by melting the fusible element under overcurrent conditions, which severs the strain wire and initiates arcing. The main and auxiliary arcing rods are drawn upward by a spring-and-cable assembly, with the auxiliary rod engaging an auxiliary contact to momentarily short out the arc. For low-magnitude faults, the large-diameter auxiliary bore delays arc extinction until sufficient gap is attained. For moderate-to-high faults, the arc lengthens as the main rod is drawn upward, providing greater surface exposure to arc-extinguishing medium and enhancing deionizing gas generation.

Fuse Type: SM-5 Refill Unit
• Manufacturer: S&C Electric Company
• Part Number: 131500R3
• Continuous Current Rating: 300 amperes
• Voltage Rating: 7.2 kV nominal
• Application: Medium-voltage distribution and substation protection
• Fusible Element: Precision-engineered silver or nickel-chrome
• Arc Interruption: High-speed elongation with deionizing gas generation
• Mounting: Compatible with SM-5 fuse mountings

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Specifications

• Part Number: 131500R3
• Manufacturer : S&C Electric
• Brand : S&C Electric
• Category : Fuse
• Item Subcategory : Medium Voltage
• Voltage : 7200
• Amperage : 300
• Class Rating : E
• Velocity : Standard

Product Data

• Weight : 3