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Cylindrical cartridge fuse with ferrule ends, silver finish, 13/16 inch diameter by 3 inches long

BUSSMANN FUSES

BUSSMANN FUSES FRN-R Cartridge Fuse 50A 250V Class R

SKU CH-BWFY-E4V4B

A heavy-duty time-delay cartridge fuse rated 50 A at 250 V, Class R, UL listed for motor overload protection

  • TypeFuse Blocks & Holders
  • Protects motors from burnout with dual-element time-delay design
  • Handles startup surges safely before opening on sustained overloads
  • UL Listed Class R with 200,000 AIR interrupting rating
  • 50 A, 250 V cartridge fuse with ferrule ends
  • Heavy-duty Fusetron construction for reliable industrial circuit protection

50 A Class R Time-Delay Fuse

This heavy-duty FRN-R cartridge fuse is rated for 50 A at 250 V and carries a UL listing with a 200,000 A interrupting rating. It uses a dual-element design that tolerates normal motor-start surges while opening on sustained overloads. The fuse has ferrule ends and measures 13/16 in. diameter by 3 in. length. It is intended for industrial motor-circuit protection.

250 V Class R Application Limits

The Class R rating means this fuse fits only Class R fuse blocks or holders rated for 250 V and the same interrupting capacity. It cannot be used in higher-voltage systems or in holders sized for Class H, K or J fuses. The time-delay characteristic suits motor loads but is not appropriate for fast-acting semiconductor protection. Ferrule ends limit use to clips accepting 13/16 in. diameter fuses up to 60 A.

50 A Rating Determines Fit

The 50 A rating is the single specification that decides whether this is the correct replacement; it must match the circuit design value exactly. A lower or higher amperage fuse will either nuisance-trip or fail to protect the motor windings. Buyers who need a different current rating or a non-time-delay characteristic must select a different part number.

Highlights

  • Protects motors from burnout with dual-element time-delay design
  • Handles startup surges safely before opening on sustained overloads
  • UL Listed Class R with 200,000 AIR interrupting rating
  • 50 A, 250 V cartridge fuse with ferrule ends
  • Heavy-duty Fusetron construction for reliable industrial circuit protection

Specifications

BrandBussmann Fuses
TypeFuse Blocks & Holders

Questions about this item

Should I pick the 50A FRN-R cartridge fuse or a different amperage for my circuit?

Choose the 50A rating only if your circuit requires exactly 50 amps; the FRN-R series covers 1/10A to 60A with ferrule ends and 70A to 200A with knife-blade ends, so match the fuse to the circuit's rated current.

What does the 200,000 AIR rating mean when the fuse is installed in my panel?

The 200,000 AIR rating means the fuse can safely interrupt a short-circuit current up to 200,000 amps at 250V, protecting downstream equipment from catastrophic fault energy.

How does the Class R rating and 250V limit affect which fuse blocks I can use?

Class R fuses fit only Class R fuse blocks, which reject lower-class fuses; the 250V rating caps the maximum system voltage, so do not install this fuse on circuits exceeding 250V.

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