Littelfuse LFR250303C Class R ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$83.81
Littelfuse LFR250303C Class R Fuse Block, 250V 30A DIN Rail Mount

Littelfuse LFR250303C Class R Fuse Block, 250V 30A DIN Rail Mount

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Model: LFR25030-3C

In Stock (leaves warehouse same day if ordered before 3pm ET)

$83.81
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Littelfuse LFR250303C Class R Fuse Block, 250V 30A DIN Rail Mount

The Littelfuse LFR250303C Class R Fuse Block provides dependable overcurrent protection for Class R fuses rated up to 30A at 250VAC. Designed for flexible Bolt-In or DIN Rail mounting, this fuse block features reinforcing clips standard on all Class R fuse blocks along with universal mounting holes for easy replacement in commercial and industrial electrical panels. The clip design maximizes electrical contact and minimizes heat rise for consistent, long-term performance across demanding overcurrent protection installations.

Key Features

  • Ampere Rating: 30A rating supports reliable overcurrent protection for Class R fuse applications.
  • Voltage Rating: 250VAC rated construction suited to standard panel and load center circuits.
  • Mounting Method: Bolt-In / DIN Rail mounting offers flexible installation options for panels and enclosures.
  • Durable Construction: Reinforcing clips are standard on all Class R fuse blocks for secure, long-lasting fuse retention.
  • Easy Replacement: Universal mounting holes simplify installation and replacement in the field without special hardware.
  • DIN Rail Releasable: Releasable design for all non-knife blade style fuses, with one-hand lock-open, lock-closed operation for fast servicing.
  • Optimized Clip Design: Clip geometry maximizes electrical contact and minimizes heat rise at the connection point for improved reliability.

Certifications & Compliance

  • UL Listed (File E14721)
  • cUL Listed (File E14721)
  • CSA Certified

Technical Specifications

  • VAC (V): 250
  • Ampere Rating (A): 30
  • Indicating: No
  • Fuse Type: Class R
  • Mounting Method: Bolt-In / DIN Rail

Typical Applications

  • Panelboard and Load Center Wiring
  • Industrial and Commercial Overcurrent Protection
  • DIN Rail Mounted Fuse Systems
  • Motor Control and Distribution Panels
  • Renovation and New Construction Electrical Panels

Why Littelfuse?

Littelfuse Class R fuse blocks are built with reinforcing clips and an optimized contact design to deliver secure, low-heat-rise connections for demanding electrical environments. With UL Listing, cUL Listing, and CSA certification behind the LFR250303C, this fuse block supports code-compliant, professional-grade overcurrent protection for commercial and industrial installations where dependable performance is essential.

Product Specs

Product Type:
Fuse Block
Voltage Rating:
250V
Amperage Rating:
30A
Configuration:
DIN Rail / Bolt-In Mount
Listing:
UL Listed
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuse Holders & Blocks

Littelfuse LFR25030-3C – Frequently Asked Questions

1) Will the Littelfuse LFR25030-3C accept Class RK1 and RK5 fuses, or only one style?
The LFR25030-3C is built for Class R fuses rated up to 30A at 250VAC, which covers both RK1 and RK5 current-limiting fuses in that case size. The rejection feature that defines a Class R block is what keeps a non-rejection Class H or K fuse out of the clips, so you cannot downgrade the circuit by dropping in a standard one-time fuse.
2) Can I mount this Littelfuse Class R fuse block on DIN rail, or does it have to be bolted to the panel?
Either way. The LFR25030-3C is configured for both DIN rail and bolt-in mounting, and the DIN rail attachment is releasable with one-hand lock-open, lock-closed operation so you can pull the block off the rail during service. The bolt-in holes are universal pattern, so in a retrofit you can usually reuse the existing holes in the panel backplate without re-drilling.
3) Is the Littelfuse LFR250303C fuse block UL Listed and CSA certified for an inspected commercial panel?
Yes. The block is UL Listed and cUL Listed under file E14721, and CSA Certified, so it will stand up in both US and Canadian inspected installations.
4) Can I use a 250V fuse block on a 480V three-phase circuit?
No. The LFR25030-3C is rated 250VAC maximum, so it is limited to 120/240V single-phase or 240V three-phase systems. A 480V feeder needs a 600V-rated Class R block, and installing a 250V block there is a code violation regardless of the fuse you put in it.
5) If the panel uses Class CC fuses instead of Class R, what fuse block should be used in place of the Littelfuse LFR25030-3C?
The LFR25030-3C is built for Class R fuses rated to 30A at 250V, and Class R and Class CC fuses are not dimensionally interchangeable in the same clips. For a Class CC circuit, the Bussmann CHCC2DIU is a 2-pole Class CC modular fuse block with a finger-safe body and a blown-fuse indicator. The Littelfuse Class R block is non-indicating, so if visual blown-fuse indication matters the Class CC unit is the one that provides it.
6) Can the Littelfuse LFR25030-3C fuse block be used on a solar PV DC circuit?
No. The LFR25030-3C is rated 250VAC for Class R fuses in panelboards, load centers, and motor control and distribution panels. Photovoltaic strings run at much higher DC voltages, and for that duty the Bussmann CHPV2 series is a modular two-pole photovoltaic fuse block rated 1000 Vdc. Use the CHPV2 on the array side and keep the Class R block on the 250VAC distribution side.
7) How many poles does the Littelfuse LFR250303C fuse block have?
It is a three-pole block, which is what you want for a three-phase 240V feeder or a three-phase motor branch circuit. For single-phase 120/240 work you would be paying for a pole you don't use, so look at a two-pole block instead.
8) What are the alternatives if I need a finger-safe or photovoltaic DC fuse block instead of this Class R block?
The LFR25030-3C is an AC Class R block at 250V, so it is not a DC solar part. For photovoltaic DC work ZenSupply carries the Bussmann CHPV2 Series modular two-pole block rated 1000 Vdc. If you want a finger-safe touch-protected AC block, the Bussmann CHCC2DIU is a two-pole Class CC modular block described as finger-safe. Neither takes Class R fuses, so you would be changing fuse class along with the block.
9) Is the Littelfuse LFR25030-3C suitable for a motor control panel?
Yes, motor control and distribution panels are among its intended uses, along with panelboard and load center wiring and DIN rail fuse systems. Class R fuses are the usual choice there because the rejection feature keeps the branch circuit's interrupting rating intact when someone replaces a fuse later. Keep the circuit at 30A or less and 250VAC or less.
10) Can I use knife-blade fuses in this DIN rail releasable Littelfuse block?
No. The releasable DIN rail design covers non-knife-blade style fuses. At 30A, 250V Class R fuses are ferrule style anyway, so that matches the block. Knife-blade construction starts at the larger Class R case sizes above this one, and those need the correspondingly larger block.
11) Which fuse block should I pick if I need to add poles later without replacing the whole assembly?
The Littelfuse LFR25030-3C is a three-pole Class R block with universal mounting holes, bolt-in or DIN rail mount, so pole count is fixed at the point of purchase. If the design may need poles added or rearranged, the modular Bussmann options are built for that approach: the BCM603 series is a two-pole modular fuse block and the CHCC2DIU is a two-pole Class CC modular block, both ganged in modules rather than supplied as one fixed assembly. The tradeoff is fuse class, since only the Littelfuse unit takes Class R.
12) Does this Littelfuse fuse block have a blown-fuse indicator?
No, the LFR250303C is non-indicating. If you want a visual blown-fuse flag on the block itself, the Bussmann CHCC2DIU is a Class CC modular block with an indicator, though it is a two-pole Class CC unit and takes a different fuse family, not Class R.
13) Why do the reinforcing clips on a Class R fuse block matter?
Clip pressure is what controls heat at the fuse connection. The reinforcing clips are standard on the Littelfuse Class R blocks and the clip geometry is shaped to maximize contact area, which keeps heat rise down. In a tight motor control or distribution enclosure running near its load rating, that is the difference between a connection that stays tight and one that anneals and starts loosening over a few seasons.
14) For an MRO buyer standardizing panel fuse blocks, how do the Littelfuse LFR25030-3C and the Bussmann BCM603 differ?
The LFR25030-3C is a Class R fuse block rated 30A at 250V that mounts either bolt-in or on DIN rail, carries UL Listing, and is non-indicating. The Bussmann BCM603 is a two-pole modular fuse block in the BCM series. The practical split for a standardization program is fuse class and pole count: stock the Littelfuse unit where the panel schedule calls for Class R rejection-style fuses at 250V, and the modular Bussmann where a two-pole modular arrangement is specified.
How fast can I get the Littelfuse LFR25030-3C delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse LFR25030-3C come with a warranty?
Absolutely. The Littelfuse LFR25030-3C is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse LFR25030-3C?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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