NEPSI's Metal-Enclosed Capacitor Banks and Harmonic Filter Banks are equipped with a main-incoming fuse compartment that is isolated from the capacitor/reactor compartment and the main incoming/air-disconnect compartment. This allows for safe replacement of blown fuses. Fuses are equipped with blown fuse indicators and are visible through a window.

NEPSI tyically utilizes medium voltage current limiting fuses from either Cooper Power Systems or Ferras Shawmut. Non-Current Limiting Fuses from S&C are also utilized for system voltages greater than 15.5kV and when bank currents exceed available current limiting fuse ratings. The specific fuse utilized is dependent upon customer preference, lead-time, cost, voltage and current rating.

• Voltage Rating - Fuse voltage rating is chosen such that it is greater than the system line-line voltage. See Table-1 for available voltage ratings.
  
  
• Current Rating - Fuse current rating is chosen such that it is at least 35% greater than the banks full load current. Banks with expansion capability may be equipped with higher current rated fuses or with provision that will accept a higher current rated fuse. See Table-1 for available current ratings.
  
  
• Short Circuit Rating - Fus short circuit rating is chosen such that it is greater than the available short circuit current at the capacitor bank terminals. See Table-1 for maximum available values.
  
  
  

  Table 1 - Available Current Rating Range, Short Circuit Ratings, and Product Literature
  Fuse Voltage Rating (kV)
  4.3	N/A	50kA, 18 - 100	N/A
  5.5	63kA, 10E - 900E	50kA, 6 - 75	27kA, To 720E #
  8.3	N/A	50kA, 1.5 100	N/A
  15.5	50kA, 10E - 300E	50kA, 1.5 - 100	N/A
  17	N/A	N/A	25kA, To 720E #
  23	N/A	50kA, 6 - 40	N/A
  27	N/A	35kA, 6 - 50	20kA, To 300E #
  38	N/A	35kA, 6 -50	17.5kA, To 300E #
  Adobe Acrobat Files	CL-14 Fuse Literature	NX Fuses Literature X-Limiter Literature	SM and SML Literature
  # - Values shown are maximum values. Depending upon fuse part number, ratings may be less. See data sheets for detailed data.