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Cylindrical melamine fuse with metal end caps, 50A 600V AC rating

Bussmann

Bussmann LPJ-50SPI fuse J class time-delay 50A 600V AC

SKU CH-HPEW-MK708

A 50 A, 600 V AC time-delay Class J fuse with visual indication and a 300 kA interrupt rating

  • Time-delay operation prevents nuisance trips on motor start-up
  • Indicating window shows blown status at a glance
  • 300 kA interrupt rating at 600 V AC protects downstream gear
  • 100 kA DC rating at 300 V suits battery-backed systems
  • Cylindrical Class J body fits standard non-rejection fuse blocks

Eaton Bussmann LPJ-50SPI Fuse

This Eaton Bussmann LPJ-50SPI is a UL Class J time-delay fuse rated at 50 amps and 600 volts AC. It serves industrial and commercial electrical panels that require high interrupting capacity and reliable overload protection. The cylindrical melamine body fits standard non-rejection fuse blocks. An indicating feature provides visual confirmation when the element has opened.

Check Voltage and Block Compatibility

Verify that your circuit operates at or below 600 volts AC and 300 volts DC before installation. Confirm the fuse block accepts Class J cylindrical fuses with non-rejection mounting, such as CH60J, JM600, JT600 or JTN600 series. The fuse measures 2-3/8 inches long by 1-1/16 inches in diameter, so ensure the clip spacing matches. The time-delay characteristic suits motor-start and transformer inrush currents.

Replaces Equivalent Class J Fuses

This fuse replaces Bussmann LPJ-I, Littelfuse JTD-ID and Mersen AJT series fuses of the same ampere and voltage ratings. The upgrade is worth it when you need the 300 kA interrupt rating at 600 V AC or the 100 kA rating at 300 V DC. It is not for circuits requiring rejection-style Class R blocks or for low-voltage automotive blade-fuse applications.

Highlights

  • Time-delay operation prevents nuisance trips on motor start-up
  • Indicating window shows blown status at a glance
  • 300 kA interrupt rating at 600 V AC protects downstream gear
  • 100 kA DC rating at 300 V suits battery-backed systems
  • Cylindrical Class J body fits standard non-rejection fuse blocks

Specifications

BrandEATON BUSSMANN

Questions about this item

Does the LPJ-50SPI come with a fuse block or must that be purchased separately?

The fuse fits CH60J, JM600, JT600 and JTN600 series blocks; a compatible block must be bought separately.

Which current rating and voltage class should I select for a 50 A, 600 V AC circuit?

This model is rated 50 A at 600 V AC (and 300 V DC), matching that requirement exactly.

What does the 300 kA interrupt rating mean when the fuse operates in a 600 V AC panel?

It can safely clear fault currents up to 300 kA at 600 V AC without rupturing.

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