Mersen Midget Fuse Block, Poly...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$26.19
Mersen Midget Fuse Block, Polycarbonate, 600VAC/600VDC

Mersen Midget Fuse Block, Polycarbonate, 600VAC/600VDC

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Model: 30321

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

$26.19
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Mersen Midget Fuse Block, Polycarbonate, 600VAC/600VDC

The Mersen Midget Fuse Block delivers reliable overcurrent protection for both AC and DC circuits rated up to 600VAC/600VDC. This 3-Pole fuse block accepts Midget class fuses up to 30A and is molded from glass filled polycarbonate with reinforced pressure plate clips for secure, vibration-resistant fuse retention. Backed by a short circuit current rating of 10 to 100 kA (dependent on installed fuse) and RoHS compliant construction, it is a solid fit for professional industrial and commercial electrical protection circuits.

Key Features

  • 30A Current Rating: Handles substantial electrical loads with reliable overcurrent protection for critical circuits, with a max fuse rating of 30A.
  • 600VAC/600VDC Dual Voltage: Versatile voltage compatibility supports both alternating and direct current applications in a single unit, rated at 50/60 Hz.
  • 3-Pole Configuration: Provides coordinated fuse operation across three phases or circuits from one compact fuse block.
  • Durable Construction: Glass filled polycarbonate body insulating material ensures long-term durability and electrical safety in demanding environments.
  • Reinforced Pressure Plate Clips: Enhanced clip-in fuse installation design provides secure fuse retention and reliable electrical contact under vibration and thermal cycling.
  • Dual Mounting Options: Screw mount or DIN rail compatibility offers flexible installation in various panel configurations.
  • Midget Fuse Class: Accepts Midget class fuses with a secure clip-in installation method and a 20 lb-in torque rating for terminations.
  • Compact Footprint: Measures 3.04" L x 2.35" W x 1.31" H and weighs just 0.35 lb, conserving valuable panel space.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Amperage Rating: 30A

Typical Applications

  • Industrial Control Panels and Motor Control Centers
  • Commercial Electrical Distribution Systems
  • Manufacturing Equipment Protection Circuits
  • Power Distribution Units and Switchgear
  • Process Control and Automation Systems
  • Renewable Energy System Protection

Why Mersen?

Mersen fuse blocks deliver proven reliability with glass filled polycarbonate construction and RoHS compliant manufacturing. The reinforced pressure plate clip design with a 20 lb-in torque rating ensures secure, vibration-resistant connections, while the compact 3.04" x 2.35" x 1.31" footprint maximizes panel space efficiency. Backed by a short circuit current rating of 10 to 100 kA depending on the fuse installed, this Midget fuse block is built for dependable 600VAC/600VDC overcurrent protection in professional electrical installations, whether mounted by screw or DIN rail.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Type:
Fuse Block
Amperage Rating:
30A
Voltage Rating:
600VAC/600VDC
Product Material:
Polycarbonate
Standards:
RoHS Compliant
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuse Holders & Blocks
Product Length:
3.04 in
Product Height:
1.31 in

Mersen 30321 – Frequently Asked Questions

1) What fuse class and size does the Mersen Midget fuse block accept?
It takes Midget class fuses (13/32 x 1-1/2 inch) up to 30A, held by reinforced pressure plate clips that clip the fuse in rather than screwing it down. If your fuses are Class CC, Class G, Class R, or ATC/AGC automotive style, this is the wrong block for them.
2) Can I use this Mersen fuse block on a 600V DC circuit, not just AC?
Yes. The block is rated 600VAC and 600VDC, so it is suitable for DC applications such as battery and renewable energy circuits as well as 50/60 Hz AC control and distribution panels. The DC rating is the same 600V, so you do not have to derate for DC use.
3) How many poles can I get, and which Mersen part number is the 3-pole?
Three pole counts are offered: 1-pole is part 30321, 2-pole is 30322, and 3-pole is 30323. Use the 3-pole for a three-phase feeder or motor branch circuit, 2-pole for single-phase line and neutral or a DC pair, and 1-pole where you only need to protect a single conductor.
4) What short circuit current rating does this Mersen block have for a panel SCCR calculation?
The block carries a short circuit current rating of 10 to 100 kA, and where it lands in that range depends on the fuse you install. For a panel SCCR you use the figure tied to the specific Midget fuse installed, not the top of the range.
5) What is the difference between the Mersen Midget fuse block and a Class CC block like the Bussmann CHCC2DIU?
Both are panel-mount blocks for small-dimension fuses, but the clip geometry differs by class. The Mersen takes Midget class fuses up to 30A at 600VAC/600VDC with reinforced pressure plate clips and screw or DIN rail mounting. The Bussmann CHCC2DIU is a two-pole Class CC modular block with a finger-safe body and a blown-fuse indicator. Choose by the fuse class the circuit is designed around, and by whether you need the indicator and finger-safe cover.
6) What should I use instead of the Mersen Midget fuse block on a 1000 Vdc solar string?
The Mersen Midget block is rated 600VAC/600VDC, so a 1000 Vdc photovoltaic array is above its voltage rating. The Bussmann CHPV2 series is a modular two-pole photovoltaic fuse block rated 1000 Vdc for that application. Keep the Mersen for the 600V AC or DC portions of the system.
7) If the panel drawing calls for Class R fuses instead of Midget, what fuse block should be used in place of the Mersen 30321?
The Mersen Midget fuse block accepts Midget class fuses only, up to 30A, at 600VAC/600VDC. For a Class R opening at the same voltage and amperage, the Littelfuse LFR60030-3CID is a Class R fuse block rated 600V 30A in a three-pole arrangement. Fuse classes are not interchangeable in the clips, so the block has to match the class of fuse the drawing specifies.
8) What torque should I use on the terminal screws of this fuse block?
Terminations are rated for 20 lb-in. Hitting that figure matters on a polycarbonate block: under-torqued terminals run hot under a 30A load, over-torqued ones distort the housing.
9) Can I get more than three poles on one Mersen Midget block?
No, the pole options stop at 3-pole (part 30323). If you need four or more circuits protected from a single block, the Bussmann 3833 Series is offered in 1 to 8-pole configurations, though it is an AGC fuse block, so your fuses would change with it.
10) When would a bolt-in POWR-BLOK be used rather than the Mersen Midget fuse block?
The Mersen Midget block is a compact polycarbonate unit, about 3.04 in. by 2.35 in. by 1.31 in., that mounts by screw or snaps to DIN rail and handles up to 30A. For larger feeder work where the block is bolted directly to the panel, the Littelfuse LD series POWR-BLOKS uses bolt-in mounting. Use the Mersen where panel space is tight and the circuit is within Midget fuse territory.
11) For a 15A Class G control circuit on DIN rail, is the Mersen Midget block the right choice?
The Mersen Midget block mounts on DIN rail or by screw, but it is built for Midget class fuses up to 30A. A Class G circuit needs a Class G block: the Littelfuse LFG60015-1SQDINR is a 600V 15A Class G fuse block made for DIN rail mounting. Match the block to the fuse class called out on the schematic.
12) Can a Bussmann 3833 AGC fuse block substitute for the Mersen Midget fuse block?
No. The Bussmann 3833 series is an AGC fuse block, offered in 1 through 8-pole configurations, and AGC is a glass-tube automotive-style fuse, not a Midget. The Mersen block takes Midget class fuses up to 30A at 600VAC/600VDC in 1-, 2-, or 3-pole versions. The two look similar on a panel but will not hold each other's fuses.
13) Is the body material suitable for a hot, vibrating industrial panel?
The housing is glass filled polycarbonate, and the fuse clips are reinforced pressure plate type specifically for retention under vibration and thermal cycling. That combination is aimed at motor control centers, manufacturing equipment, and switchgear rather than light-duty enclosures.
14) Is this Mersen fuse block RoHS compliant for a spec that requires it?
Yes, it is built RoHS compliant, which covers most institutional and OEM panel specs that call out restricted substances.
How fast can I get the Mersen 30321 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 Mersen 30321 come with a warranty?
Absolutely. The Mersen 30321 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 30321?
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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