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Medium and high voltage fuses

Littelfuse

R-Rated series

Article: 00083853

Cartridge fuse / medium-voltage / for electric motors

These R-rated fuses are intelligently engineered to provide high degree of protection from power-supply malfunctions like short circuits, over-voltage, to motors, motor controllers and related devices. These units are not recommended for use in high voltage/large short circuit currents. They work extremely well with medium voltage circuits.

Motor controllers are equipped with overload relays that aid in preventing damage from overloads. They also provide motors with a locked rotor system of protection. These controllers manage low levels of short circuits thereby saving medium voltage fuses from continuous stress of low over-currents that are below their minimum limits of interrupting values.

According to NEMA guidelines, R rated fuses of medium voltage must have response times of 15-35 seconds in the event of exposure to an rms current that is hundred times their R rating value. To understand this equation, consider a fuse whose rating is 2R. It will respond in 15-35 seconds to a 2 x 100 = 200 amperes applied current, as per NEMA.

Specifications

  • Configuration: cartridge
  • Other characteristics: medium-voltage
  • Applications: for electric motors
  • Amperage: Min.: 70 A
  • VAC: Min.: 2750 V

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