Mersen Class R Fuse Block 30A ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$48.16
Mersen Class R Fuse Block 30A 250VAC/250VDC

Mersen Class R Fuse Block 30A 250VAC/250VDC

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Model: 20306R

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

$48.16
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Mersen 20308R Class R Fuse Block, 30A 3-Pole 250VAC/250VDC

The Mersen 20308R Class R Fuse Block delivers reliable overcurrent protection with a 30A ampere rating in a 3-Pole configuration rated for both 250VAC and 250VDC applications. Built with glass filled polycarbonate construction, this fuse block features reinforced clip-in installation and a direct screw mount design for secure, stable mounting. A 200 kA short circuit current rating gives it exceptional fault current interruption capability, and the design is RoHS compliant for responsible electrical component selection.

Key Features

  • Ampere Rating: 30A capacity supports medium-duty electrical circuit and equipment protection applications.
  • Dual Voltage Capability: Rated 250VAC/250VDC for versatile installation across AC and DC electrical systems.
  • Class R Fuse Compatibility: Accepts Class R fuses and rejects non-compatible types for reliable overcurrent protection.
  • Durable Construction: Glass filled polycarbonate body provides superior insulation and mechanical strength for long-term durability.
  • 200 kA Short Circuit Current Rating: Delivers robust fault current interruption for demanding electrical systems.
  • Reinforced Clip-In Installation: Secures fuse retention while allowing easy maintenance access and preventing accidental displacement.
  • Direct Screw Mount: Ensures a stable, secure installation with a 35 lb-in torque rating.
  • RoHS Compliant: Meets environmental compliance standards for responsible electrical installations.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Rohs Compliant: Yes

Typical Applications

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

Why Mersen?

Mersen builds the 20308R fuse block with glass filled polycarbonate construction, a 200 kA short circuit current rating, and a reinforced clip-in system for dependable, code-compliant overcurrent protection. The RoHS compliant design and direct screw mount installation make it a solid choice for professional electrical work requiring consistent protection across both AC and DC systems.

Manufacturer Resources

Product Specs

Product Group:
Wiring Devices
Amperage Rating:
30A
Product Type:
Fuse Block
Product Material:
Glass Filled Polycarbonate
Standards:
RoHS Compliant
Voltage Rating:
250VAC/250VDC
Department:
Electrical

Mersen 20306R – Frequently Asked Questions

1) Will a Mersen 20306R or 20308R fuse block accept Class R fuses only, or will standard Class H fuses fit?
These are Class R rejection blocks. The clips are built to take Class R fuses and reject non-compatible types, so a standard Class H or K fuse of the same case size will not seat. That rejection feature is the point of the block: it keeps someone from dropping a 10 kA interrupting fuse into a circuit that was engineered around the 200 kA short circuit current rating.
2) What is the difference between Mersen 20306R and 20308R?
Pole count, and that is the only difference. The 20306R is the 1-pole version and the 20308R is the 3-pole. Both are 30A and rated 250VAC/250VDC. Use the 1-pole for single-phase branch or DC leg protection, the 3-pole for three-phase motor and control circuits where you want all three fuses on one mounting footprint.
3) Will the Mersen 20306R fuse block work on a 1000 Vdc solar string?
No. The Mersen 20306R and 20308R are rated 250VAC/250VDC, which is well below typical PV string voltage. For a photovoltaic circuit, the Bussmann CHPV2 Series photovoltaic fuse block is a modular two-pole block rated 1000 Vdc. Use the Mersen Class R block for the 250V AC or DC control, HVAC and distribution circuits it is rated for, and the CHPV2 where the array voltage requires a 1000 Vdc rated holder.
4) Do the fuses come with the Mersen fuse block?
No. The 20306R and 20308R are the blocks only. You order Class R fuses separately, sized to the load and rated 250V or higher, one per pole. That means one fuse for the 1-pole and three for the 3-pole.
5) I need a DIN rail mounted fuse block, not a screw mount - what should I use instead of the Mersen 20306R?
The Mersen 20306R and 20308R use a direct screw mount with a 35 lb-in torque rating, so they fasten to a panel subplate rather than clipping to rail. For a rail-mounted block, the Littelfuse LFG60015-1SQDINR is a DIN rail mount fuse block rated 600V 15A. Note that it is a Class G block, so the fuse class changes along with the mounting method - confirm the circuit is specified for Class G before substituting.
6) What is the difference between the Mersen 20306R fuse block and a bolt-in POWR-BLOK?
The Mersen 20306R and 20308R are Class R blocks rated 30A at 250VAC/250VDC with a direct screw mount and reinforced clip-in fuse retention, in a glass filled polycarbonate body. The Littelfuse LD Series POWR-BLOKS fuse block uses bolt-in mounting, where the fuse itself is bolted to the block rather than held by clips. Bolt-in construction is typically specified for higher-current feeder duty; for 30A branch and control circuits taking Class R fuses, the Mersen block is the direct fit.
7) Is the Littelfuse LFR60030-3CID a drop-in replacement for a Mersen 20308R?
Both are Class R fuse blocks in a three-pole arrangement at 30A, so the fuse class and pole count line up, and the LFR60030-3CID carries a 600V rating against the Mersen 20308R's 250VAC/250VDC. They are not guaranteed to share a mounting footprint, however - the Mersen block is a direct screw mount with a 35 lb-in torque spec. Verify hole centers and overall block length against the existing subplate pattern before treating one as a bolt-for-bolt swap.
8) Will the body hold up inside a hot motor control center?
The block body is glass filled polycarbonate, which is the standard insulating base material for panel-mounted fuse blocks and gives better mechanical strength and dimensional stability than unfilled plastic. Mersen lists industrial control panels and motor control centers, HVAC protection, and process control among the intended applications.
9) Does this Mersen fuse block meet RoHS for a spec that requires it?
Yes, the 20306R and 20308R are RoHS compliant, which is what most institutional and government electrical specs are asking for on a component submittal at this level.
How fast can I get the Mersen 20306R 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 20306R come with a warranty?
Absolutely. The Mersen 20306R 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 20306R?
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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