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Cylindrical melamine fuse with bolt-on ends and indicating window

Bussmann

Bussmann LPJ-I Series 400A 600VAC/300VDC Time Delay Fuse

SKU CH-ET7P-RXYZH

400 A Class J time-delay fuse rated 600 V AC and 300 V DC with indicating body and 100 kA DC / 300 kA AC interrupt rating

  • 400 A continuous current for heavy-duty circuits
  • Time-delay operation tolerates motor inrush without nuisance trips
  • 600 V AC and 300 V DC ratings cover mixed-voltage panels
  • 300 kA AC / 100 kA DC interrupting capacity clears severe faults safely
  • Bolt-on Class J body fits JM600 blocks for secure mounting

High-Current Time-Delay Fuse

This Bussmann LPJ-I Series fuse provides 400 A overcurrent protection with a 600 V AC and 300 V DC rating. The Class J design uses a dual-element melamine body for reliable time-delay performance in industrial circuits. An integrated indicating feature gives immediate visual confirmation when the element has opened.

Suits Three-Phase Motor Circuits

The high interrupt rating of 300kA at 600 V AC makes it appropriate for heavy-duty motor starters and transformer primaries. Buyers who need a rejection-style Class J fuse for code-mandated selectivity should choose a different series. Applications requiring a faster-acting characteristic without time delay are not served by this model.

Bolt-On Mounting in JM600 Blocks

Installation consists of bolting the fuse directly into compatible JM600 series blocks, requiring only standard hand tools. The most common error is fitting the fuse into a rejection-type block where the larger diameter prevents proper seating. Verify that the block is a non-rejection style before mounting to avoid loose connections.

Highlights

  • 400 A continuous current for heavy-duty circuits
  • Time-delay operation tolerates motor inrush without nuisance trips
  • 600 V AC and 300 V DC ratings cover mixed-voltage panels
  • 300 kA AC / 100 kA DC interrupting capacity clears severe faults safely
  • Bolt-on Class J body fits JM600 blocks for secure mounting

Specifications

BrandBUSSMANN

Questions about this item

Does my fuse block need to accept a Class J bolt-on fuse for this LPJ-I to fit?

Yes, the LPJ-I uses a bolt-on body style and fits non-rejection fuse blocks such as the JM600 series.

Will this 400 A time-delay fuse coordinate with older 300 A Class J fuses in the same panel?

The higher 400 A rating and 300 kA AC interrupt rating mean it will not open at the same current level as a 300 A fuse, so selective coordination must be verified by design.

How can I confirm the fuse has blown after a fault?

The indicating feature provides a visual signal that the element has opened, letting you identify the blown fuse without test equipment.

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