Mersen 21037 Class H/K 100A Fu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$130.60
Mersen 21037 Class H/K 100A Fuse Block, Copper Box Connector

Mersen 21037 Class H/K 100A Fuse Block, Copper Box Connector

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Model: 21035R

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

$130.60
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Mersen 21037 Class H/K 100A Fuse Block, Copper Box Connector

The Mersen 21037 Class H/K 100A Fuse Block accommodates Class H, K and R power fuses rated up to 250V AC/DC, making it a dependable choice for panelboards and power distribution equipment. This fuse block platform is available in 2-Pole, 3-Pole, and Standard pole configurations, letting electrical professionals match the block to the circuit configuration required for the job while sharing the same core ratings and construction across every pole count. Built with a Box-type terminal in Tin-Plated Copper and a Glass Filled Polycarbonate insulating body verified to a dielectric strength in excess of 2500V, this fuse block delivers a secure, code-compliant connection for stranded or solid copper conductors. Rated for a 100A max fuse rating and a 2/0-#6 wiring range, it mounts via direct screw installation and uses a simple clip-in fuse installation method for fast servicing.

Key Features

  • Pole Configuration: Available in 2-Pole, 3-Pole, and Standard versions on a shared platform.
  • Max Fuse Rating: 100A, suitable for Class H, K and R 250V and 600V power fuses.
  • Rated Voltage: 250V AC UL and 250V DC UL, AC/DC operation at 50/60 Hz.
  • Wiring Range: 2/0-#6 for stranded or solid copper conductors.
  • Connection/Terminal Type: Box connector in Tin-Plated Copper for high-conductivity, corrosion-resistant terminations.
  • Body/Insulating Material: Glass Filled Polycarbonate with verified dielectric strength in excess of 2500V.
  • Installation Mounting: Direct Screw Mount with a 120 lb-in torque rating.
  • Fuse Installation Method: Clip-in, high-conductivity tin-plated copper fuse clips, spring reinforced at 100A and above.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Connection/Terminal Type: Box
  • ROHS Compliant: Yes
  • Rated voltage AC UL: 250 V
  • Rated voltage DC UL: 250 V
  • Wiring range: 2/0-#6
  • Max Fuse Rating: 100 A
  • Installation Mounting: Direct Screw Mount
  • Connection/Terminal Material: Tin-Plated Copper
  • Torque Rating: 120 lb-in
  • Ampere Rating: 100 A
  • Frequency (Hz): 50/60 Hz
  • AC or DC: AC/DC
  • Fuse Installation Method: Clip-in
  • Body/Insulating Material: Glass Filled Polycarbonate
  • Pole Configurations Available: 2, 3, Standard

Typical Applications

  • Panelboard and Load Center Fuse Protection
  • Commercial and Industrial Power Distribution Equipment
  • Class H, K and R Fuse Installations up to 100A
  • Multipole Segmented Fuse Block Assemblies
  • Overcurrent Protection for Copper or Aluminum Feeder Wiring

Why Mersen?

Mersen fuse blocks combine high-conductivity tin-plated copper clips with a Glass Filled Polycarbonate insulating body verified to dielectric strength in excess of 2500V, giving electrical professionals a dependable platform for Class H, K and R fuse protection across 2-Pole, 3-Pole, and Standard configurations. Spring reinforced clips at 100A and above, a 120 lb-in torque-rated Box connector, and RoHS compliance support reliable, code-compliant performance in panelboards and power distribution equipment.

[{"name": "Product Type", "value": "Fuse Block"}, {"name": "Connection Type", "value": "Box"}, {"name": "Voltage Rating", "value": "250V AC/DC"}, {"name": "Amperage Rating", "value": "100A"}, {"name": "Product Material", "value": "Tin-Plated Copper"}, {"name": "Standards", "value": "RoHS Compliant"}]

Manufacturer Resources

Mersen Product Catalog

Product Specs

Rated voltage AC UL:
250 V
Wiring Range:
2/0-#6
Max Fuse Rating:
100 A
Installation Mounting:
Direct Screw Mount
Connection Terminal Type:
Box
Connection/Terminal Material:
Tin-Plated Copper
Torque Rating:
120 lb-in
Ampere Rating:
100 A
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
AC or DC:
AC/DC
Fuse Installation Method:
Clip-in
Rated voltage DC UL:
250 V
Body/Insulating Material:
Glass Filled Polycarbonate
list_batch:
MERSEN-20260825
Product Type:
Fuse Block
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuse Holders & Blocks

Mersen 21035R – Frequently Asked Questions

1) Will the Mersen 21037 fuse block take Class R fuses, or only Class H and K?
The Mersen 21037 block accepts Class H, K and R power fuses up to 100A at 250V AC/DC. Note that Class H and K are non-rejection, so a Class H block style will also seat an R fuse, but it does not enforce rejection of lower-interrupting-rating fuses. If your drawing calls for a true rejection block, a Class R specific block such as the Littelfuse LFR60030-3CID is the type to look at instead.
2) What wire size will the box terminals on this 100A Mersen fuse block accept?
The box connectors are rated for a 2/0 through #6 wiring range, stranded or solid copper, and the terminal itself is tin-plated copper. Tighten to 120 lb-in. Anything smaller than #6 or larger than 2/0 needs a different block or a reducing lug.
3) Which pole count do I order for a three-phase panel?
Three pole configurations are offered: 2-pole (part 21037), 3-pole (21038R), and a Standard single version (21035R). For a three-phase, three-wire feeder use the 3-pole 21038R. All three share the same 100A, 250V AC/DC ratings and box terminals.
4) What is the closest alternative to the Mersen 21037 fuse block for a 600V Class R circuit?
The Mersen 21037 fuse block is rated 250V AC and 250V DC and takes fuses up to 100A. For a 600V Class R application at lower current, the Littelfuse LFR60030-3CID is a Class R fuse block rated 600V 30A. Choose based on the system voltage and the fuse amperage the circuit requires.
5) I need a fuse block that snaps onto DIN rail instead of screwing to a panel. What should I use instead of the Mersen 21037?
The Mersen 21037 fuse block uses a direct screw mount to the panel or backplate, torqued to 120 lb-in. If the enclosure is built around DIN rail, the Littelfuse LFG60015-1SQDINR is a Class G fuse block rated 600V 15A with DIN rail mounting. Note that it is a Class G block, so it takes a different fuse family than the Class H, K and R fuses the Mersen block accepts.
6) Can I use the Mersen 21037 fuse block on a solar PV DC string?
The Mersen 21037 fuse block is rated 250V DC, which is well below typical PV string voltages. For high-voltage DC photovoltaic circuits, the Bussmann CHPV2 Series modular two-pole photovoltaic fuse block is rated 1000 Vdc. Match the block to the maximum system DC voltage on the drawing.
7) Is the Bussmann CHCC2DIU a substitute for the Mersen 21037 fuse block?
No. The Bussmann CHCC2DIU is a 2-pole Class CC modular fuse block with a finger-safe cover and blown-fuse indicator, so it accepts Class CC fuses only. The Mersen 21037 block is built for Class H, K and R power fuses up to 100A with clip-in fuse installation. The fuse bodies are not interchangeable, so the two blocks are not drop-in replacements for each other even though both are offered in 2-pole form.
8) Is this block finger-safe for work in a live panel?
No. It is an open clip-in style block with exposed box terminals, so it is intended to be installed and serviced de-energized behind a dead front. Where a touch-safe block with blown-fuse indication is required, the Bussmann CHCC2DIU 2-pole Class CC modular block is finger-safe with an indicator, but it is a Class CC device, not Class H/K/R.
9) Will the fuse clips hold a 100A cartridge fuse tight over time?
At 100A and above the tin-plated copper clips are spring reinforced, which is what keeps clip pressure on a heavy cartridge fuse and limits heating at the contact. Fuses drop in and out by hand, no tools at the clip.
10) What should I order for small glass automotive-style fuses instead of the Mersen 21037 block?
The Mersen 21037 block is a power fuse block for Class H, K and R fuses up to 100A with a 2/0 to #6 wiring range. Small AGC glass fuses need a different holder entirely; the Bussmann 3833 Series AGC fuse block covers AGC fuses and is offered in 1 through 8-pole configurations. The Mersen block is offered in 2-pole, 3-pole and standard configurations.
11) What is the insulating body made of, and will it hold up in an industrial panel?
The body is glass filled polycarbonate, verified to dielectric strength in excess of 2500V, which is the usual material for panelboard and distribution-gear fuse blocks. The assembly is RoHS compliant.
12) I need a bolt-in power fuse block instead of screw mount. What else do you carry?
The Mersen 21037 platform is direct screw mount only. For bolt-in mounting on power distribution blocks, the Littelfuse POWR-BLOKS LD Series is a bolt-in mounted fuse block.
13) How does the Bussmann BCM603 two-pole fuse block compare with the Mersen 21037?
The Bussmann BCM603 is a two-pole modular fuse block, meaning blocks are ganged to build the pole count needed. The Mersen 21037 platform is ordered directly as 2-pole, 3-pole or standard, with a glass filled polycarbonate body and a 250V AC/DC rating at 50/60 Hz. Verify the fuse class the BCM603 accepts before treating it as an equivalent to a Class H, K and R block.
How fast can I get the Mersen 21035R delivered?
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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 Mersen 21035R come with a warranty?
Absolutely. The Mersen 21035R 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 Mersen 21035R?
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