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39018R2C8.25
Part Number 39018R2C8.25
Manufacturer Littelfuse Inc.
Description FUSE CARTRIDGE 390A 8.25KVAC
Quantity Available 53 pcs in stock
Datasheets 39018R2C8.25.pdf
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Technical Information of 39018R2C8.25
Manufacturer Part Number 39018R2C8.25 Category Circuit Protection
Manufacturer Hamlin / Littelfuse Description FUSE CARTRIDGE 390A 8.25KVAC
Package / Case Cartridge, Non-Standard Quantity Available 53 pcs
Voltage Rating - AC 8.25 kV Size / Dimension 15.875" L x 3.000" W x 6.380" H (403.23mm x 76.20mm x 162.05mm)
Series POWR-GARD® Response Time -
Package / Case Cartridge, Non-Standard Package Bulk
Operating Temperature - Mounting Type Requires Holder
Fuse Type Cartridge Features Indicating
Current Rating (Amps) 390A Class R
Breaking Capacity @ Rated Voltage 80kA Approval Agency -
Applications Motor Protection  
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Frequently Asked Questions

  • What current rating does the 39018R2C8.25 fuse provide for motor protection circuits? The 39018R2C8.25 fuse carries a 390A current rating, which allows it to support continuous motor operation while providing sufficient headroom before nuisance tripping occurs during normal running currents or moderate overloads typical in industrial three-phase applications.
  • How does the 8.25 kVAC voltage rating of the 39018R2C8.25 fuse determine its suitability for AC power distribution? The 8.25 kVAC rating of the 39018R2C8.25 fuse ensures safe operation in medium-voltage AC systems by preventing premature interruption under nominal operating conditions while still enabling reliable fault clearing when transients or faults exceed the component limits.
  • What is the breaking capacity of the 39018R2C8.25 fuse, and what does it mean for fault clearing time? The 39018R2C8.25 fuse provides an 80kA breaking capacity at rated voltage, which directly influences the speed and completeness of short-circuit clearing in systems where available fault currents approach or exceed this level, thereby reducing energy let-through to protect connected motors and wiring.
  • Why does the 39018R2C8.25 fuse require a holder for mounting, and how does its physical dimension influence panel design? The 39018R2C8.25 fuse measures 15.875" L x 3.000" W x 6.380" H and requires a holder because of its non-standard cartridge construction, which forces designers to incorporate dedicated mounting provisions and account for added depth in control panels to maintain proper airflow and accessibility.
  • How does the indicating feature of the 39018R2C8.25 fuse aid in troubleshooting during operation? The indicating capability of the 39018R2C8.25 fuse enables immediate visual verification of whether the fuse has opened following an overcurrent event, allowing maintenance teams to isolate the faulty section quickly without relying solely on remote monitoring or specialized test gear in motor control setups.
  • In what way does the Class R classification of the 39018R2C8.25 fuse support its use in motor protection? The Class R classification of the 39018R2C8.25 fuse optimizes performance in motor circuits by delivering high interrupting capacity that effectively manages both running loads and the large inrush currents encountered during motor starting, while maintaining coordination with upstream and downstream devices.
  • What operating conditions should be considered when applying the 39018R2C8.25 fuse in high-voltage AC motor drives? When deploying the 39018R2C8.25 fuse in high-voltage AC motor drives, system designers must confirm that the 8.25 kVAC rating aligns with the drive input voltage and that the 80kA breaking capacity exceeds the inverter's contribution to fault currents to ensure the fuse clears faults before damage propagates through the motor winding or bearings.
  • How does the 39018R2C8.25 fuse's performance compare to lower current cartridge fuses in terms of protecting against high fault currents? The 39018R2C8.25 fuse, unlike lower current cartridge fuses, can interrupt up to 80kA, making it preferable in systems with significant short-circuit levels where smaller fuses would open too slowly or not at all, thereby reducing the risk of cascading failures in industrial motor branches.
  • Is the 39018R2C8.25 fuse appropriate for use in consumer electronics or primarily for industrial motor protection? The 39018R2C8.25 fuse is primarily intended for industrial motor protection due to its high current and voltage ratings and large size, whereas consumer electronics benefit more from compact, low-current fuses; its use in consumer setups would be impractical given the dimensions and power levels.
  • What replacement strategy is recommended when upgrading motor protection systems to include the 39018R2C8.25 fuse? When upgrading motor protection systems, engineers should evaluate whether the 39018R2C8.25 fuse's 390A rating and Class R characteristics meet updated fault current requirements, potentially comparing it to smaller Class J alternatives that might reduce panel depth in retrofits while still delivering adequate protection for legacy motor loads.
  • How does the RoHS non-compliant status of the 39018R2C8.25 fuse affect its selection in modern designs? The RoHS non-compliant status of the 39018R2C8.25 fuse may limit its adoption in regions enforcing strict environmental regulations, prompting consideration of equivalent high-current fuses if available, while still leveraging its performance characteristics in legacy systems where regulatory constraints are less stringent.
  • Can the 39018R2C8.25 fuse serve as a direct replacement for similar high-voltage fuses from other manufacturers in industrial applications? The 39018R2C8.25 fuse can often serve as a direct replacement for comparable high-voltage Class R fuses from other manufacturers due to its matching 390A rating, 8.25 kVAC, and 80kA interrupting capacity, provided the holder and mounting dimensions are compatible with the existing installation.
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