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Transparent three-pole fuse block with finger-safe covers, DIN rail mount

Mersen

Mersen US3J3I Finger Safe Fuse Block 3-Pole 600V

SKU CH-87ZG-S8HS5

Three-pole Class J fuse block with finger-safe pressure-plate terminals for 14-2 AWG wire, DIN-rail mountable, UL listed and CSA certified at 600V AC/DC

  • Product typeFuses & Accessories
  • Product colorTransparent
  • Finger-safe design prevents accidental contact with live parts
  • Three-pole configuration handles three-phase or multi-circuit loads
  • 600 V AC/DC rating suits industrial power systems
  • Accepts 14 to 2 AWG conductors for flexible wiring
  • DIN-rail mounting enables quick panel installation

Three-Pole Class J Fuse Block

The Mersen US3J3I is a finger-safe fuse block built for Class J fuses up to 30 A at 600 V AC or DC. It accepts three poles on a DIN-rail mount and uses pressure-plate connectors for 14 to 2 AWG wire. The polyamide body measures 4.49 in long, 3.84 in wide and 3.15 in high. It carries UL Listed and CSA Certified markings.

Installers needing indicating, non-rejection blocks

This block suits panels that require visual indication and a finger-safe design for Class J fuses such as the A4J, AJT, DFJ, HSJ, JKS, JLS, JTD, JTD-ID, LDFJ, LPJ or LPJ-I series. It is not for applications that demand a rejection-style block, a different pole count, a higher ampere rating or a fuse class other than Class J. Builders needing those features should look at alternative products.

Verify fuse class, ampere rating and mounting

Confirm that the circuit uses Class J fuses rated 0 to 30 A and that a three-pole, indicating, non-rejection block matches the protection scheme. Check that DIN-rail mounting fits the enclosure and that 14 to 2 AWG conductors suit the wiring plan. Ensure the 4.49 in by 3.84 in footprint clears adjacent components.

How it compares

Measured against everything we stock in AV Accessories & Components, at today’s prices. Recalculated every night.

Price $105.99
Pricier than about 76% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameMERSEN
Product typeFuses & Accessories
Product colorTransparent

Questions about this item

What type of fuses must I already have to use this 3-pole block?

The block accepts UL Class J fuses rated 0 to 30 A and 600 V AC/DC in the 2-1/4 in by 13/16 in size, covering series such as A4J, AJT, DFJ, HSJ, JKS, JLS, JTD, JTD-ID, LDFJ, LPJ and LPJ-I.

Will my existing DIN-rail terminal blocks fit on the same rail as this fuse block?

Yes, the fuse block mounts on standard DIN rail, so it shares the same rail profile as other DIN-rail terminal blocks you already use.

How can I confirm the block is operating correctly after wiring?

The indicating design provides a visual signal when a fuse has opened, letting you verify circuit status at a glance.

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