Mersen Class CC Adder Fuse Blo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$22.10
Mersen Class CC Adder Fuse Block, 30A 600VAC/VDC Screw Connector

Mersen Class CC Adder Fuse Block, 30A 600VAC/VDC Screw Connector

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Model: 30310R

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

$22.10
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Mersen Class J 60A Fuse Base Adder Block, Tin-Plated Copper Clip

The Mersen Class J 60A Fuse Base Adder Block is a 600V-rated fuse base engineered for use with AJT, A4J, and HSJ Class J fuses. This adder configuration snaps onto 1-, 2-, or 3-pole blocks to build multi-pole segmented fuse blocks in the field, saving panel space and simplifying inventory. High conductivity tin-plated copper clips with spring reinforcement grip the fuse firmly, while the glass-filled polycarbonate (GFPC) body insulator delivers verified dielectric strength in excess of 2500V for dependable protection in demanding electrical distribution equipment.

Key Features

  • Ampere Rating: Rated 60A, matching a 60A maximum fuse rating for reliable overcurrent protection with Class J fuses.
  • Adder Pole Configuration: Snaps onto 1-, 2-, or 3-pole blocks to form multi-pole segmented fuse blocks of as many poles as needed.
  • Reinforced Clip Connection: Box-style wire connection with spring-reinforced, high conductivity tin-plated copper clips for a secure, low-resistance connection.
  • Durable Insulation: Glass-filled polycarbonate (GFPC) body insulator with dielectric strength verified in excess of 2500V.
  • Torque Rating: 45 lb-in torque rating for properly secured terminations.
  • Short Circuit Current Rating: 200 kA SCCR supports use in high fault-current applications.
  • Operating Range: Rated for operation up to 80°C and storage from -25°C to 80°C, and 50/60 Hz frequency.
  • Voltage Rating: 600V AC/DC rating for Class J fuse holder applications.

Certifications & Compliance

  • CSA Certified, Class 6225, File 32169
  • Meets UL4248 requirements (formerly UL512)
  • UL Listed, Guide IZLT, File E52283

Technical Specifications

  • Number Of Poles: Adder
  • Torque Rating: 45 lb-in
  • Ampere Rating: 60 A
  • Body Insulating Material: GFPC
  • Max Operating Temp: 80°C
  • Min/Max Storage Temp: -25°C to 80°C
  • Frequency: 50/60 Hz
  • Wire Connections: Box with Reinforced Clip
  • Product Line: Class J Fuseholders - Class J
  • Max Fuse Rating: 60 A
  • Installation Mounting: Direct Screw Mount
  • Fuse Installation Method: Clip-in
  • Short Circuit Current Rating (SCCR): 200 kA
  • Rated Voltage AC/DC (UL): 600 V
  • Country Of Origin: MX

Typical Applications

  • Panelboards and Switchboard Fuse Protection
  • Industrial Control Panels
  • Motor Control Centers
  • Electrical Distribution Equipment
  • OEM Electrical Assemblies Using Class J Fuses

Why Mersen?

Mersen Class J fuse bases combine tin-plated, spring-reinforced copper clips with a glass-filled polycarbonate insulator tested well beyond 2500V dielectric strength, backed by CSA certification and UL4248 / UL Listing. The adder block design gives electrical contractors and panel builders a flexible, code-compliant way to configure multi-pole Class J fuse holders for reliable performance in commercial and industrial power distribution equipment.

Manufacturer Resources

Spec Sheet

Product Specs

Voltage Rating:
600V
Product Group:
Circuit Protection
Department:
Electrical
list_batch:
MERSEN-20260825
Configuration:
Adder
Product Type:
Fuse Block
Product Subgroup:
Fuse Holders & Blocks

Mersen 30310R – Frequently Asked Questions

1) What does an "adder" fuse block actually do, and can I use it on its own?
An adder block is not a standalone holder. It snaps onto an existing 1-, 2-, or 3-pole Mersen fuse block to extend it, so you can build a segmented multi-pole assembly with as many poles as the panel needs. If you have no base block yet, you need a 1-, 2-, or 3-pole block first and then add poles with adders. For panel builders this cuts the number of part numbers you stock, since one adder covers any pole count you want to reach.
2) Is this fuse block rated for DC, or AC only?
600 V, AC and DC both. Frequency rating is 50/60 Hz on the AC side, so it works for standard industrial control panel and distribution use as well as DC circuits at or below 600 V.
3) Will this block hold up on a 200 kA available fault current service?
Yes. The short circuit current rating is 200 kA, which covers high fault-current locations in switchboards, motor control centers, and industrial control panels. Pair it with the correct current-limiting fuse so the overall assembly rating is maintained.
4) What torque do I tighten the terminals to?
45 lb-in. The terminals are box-type connections with spring-reinforced, tin-plated copper clips, so hitting the specified torque matters for a low-resistance joint that will not loosen under thermal cycling.
5) How does this block mount, and can I put it on DIN rail?
Mounting is direct screw mount to a panel or subplate, not DIN rail. If your assembly is built on DIN rail, look at a rail-mount block instead, such as the Littelfuse LFG60015-1SQDINR Class G block for 600 V 15 A circuits. Fuses themselves install by clipping in, no bolting required.
6) What is the closest Bussmann equivalent to the Mersen 30310R Class CC adder fuse block?
For Class CC fuses, Bussmann's closest offering is the CHCC2DIU, a 2-pole Class CC modular fuse block that is finger-safe and includes a blown-fuse indicator. The Mersen 30310R is an adder section rather than a complete block - it snaps onto an existing 1-, 2-, or 3-pole base to extend pole count in the field, and it is rated 600V AC/DC. The Bussmann unit is supplied as a fixed two-pole modular block, so if you need to add a single pole to a base already in the panel the adder approach is the one that fits; if you are starting from scratch with two poles and want an indicator, the CHCC2DIU covers it.
7) I need a 600V 30A fuse block but my fuses are Class R, not Class CC. What should I use?
Use the Littelfuse LFR60030-3CID, a Class R fuse block rated 600V at 30A. Class CC and Class R fuses have different body dimensions and rejection features, so the Mersen 30310R clips, which are built for Class CC at 600V AC/DC, will not accept a Class R fuse. Match the block to the fuse class you are actually stocking.
8) What looks like a substitute for the Mersen Class CC adder block but will not work?
Two to rule out. The Bussmann 3833 Series block is built for AGC glass-tube automotive-style fuses in 1 to 8-pole configurations, which are a completely different fuse body than Class CC. The Bussmann CHPV2 Series is a modular two-pole photovoltaic block rated 1000 Vdc for PV fuses on solar DC strings. Both are modular and multi-pole like the Mersen adder, but neither accepts a Class CC fuse, and the Mersen block is rated 600V AC/DC rather than 1000 Vdc.
9) My panel runs a 1000 Vdc solar string. Can I use the Mersen 600V adder block?
No. The Mersen Class CC adder block is rated 600V AC/DC, so it is below a 1000 Vdc string voltage. For that application use the Bussmann CHPV2 Series photovoltaic fuse block, a modular two-pole unit rated 1000 Vdc. Keep the Mersen block on 600V and below distribution, control panel, and motor control work.
10) Which amp ratings does the Mersen adder fuse block come in?
Two ampere ratings are offered: 30 A (part 30310R) and 60 A (part 60605J). Pick the one that matches the maximum fuse rating in the circuit; the block's ampere rating and its maximum fuse rating are the same number.
11) Can this fuse block take the heat inside a sealed enclosure?
Maximum operating temperature is 80 C, and it stores from -25 C to 80 C. The body is glass-filled polycarbonate with dielectric strength verified above 2500 V, so the insulator holds up in warm panel interiors. Watch internal enclosure rise in high ambient installations so you stay under the 80 C operating limit.
12) I need a finger-safe block with a blown fuse indicator instead. What else is there?
The Mersen adder block has open clip construction and no indicator. For a touch-safe assembly with indication, the Bussmann CHCC2DIU is a 2-pole Class CC modular block that is finger-safe and carries an indicator. For a Class R application at 600 V 30 A, the Littelfuse LFR60030-3CID is a three-pole option.
13) Can I get a 600V fuse block that mounts on DIN rail instead of screwing to the panel?
The Littelfuse LFG60015-1SQDINR is a DIN rail mount block rated 600V at 15A for Class G fuses. The Mersen Class CC adder block uses direct screw mounting to the panel subplate. If your control panel layout is DIN-rail based and 15A Class G protection suits the circuit, the Littelfuse unit avoids drilling and tapping; if you are building a screw-mounted segmented block, the Mersen adder is the one that snaps into that assembly.
14) Is there a bolt-in fuse block option instead of a clip-in adder?
Yes - the Littelfuse LD Series POWR-BLOKS fuse block uses bolt-in mounting. The Mersen Class CC block uses a clip-in fuse installation method with spring-reinforced tin-plated copper clips and a box-style wire connection torqued to 45 lb-in. Bolt-in construction means the fuse is bolted to the terminals rather than snapped between clips, which is a different service routine when replacing fuses.
15) If I want a two-pole modular block rather than building one from adders, what are my options?
Bussmann offers the BCM603 Series as a two-pole modular fuse block, and the CHCC2DIU as a two-pole Class CC modular block with finger-safe construction and a blown-fuse indicator. The Mersen approach is different by design: the adder section snaps onto a 1-, 2-, or 3-pole base so you can build a segmented block to any pole count on site, which reduces how many distinct block part numbers you need to stock.
16) Which of these fuse blocks gives a blown-fuse indicator?
The Bussmann CHCC2DIU Class CC modular block is specified as finger-safe with an indicator, and the Littelfuse LFR60030-3CID Class R block carries an indicator designation as well. The Mersen Class CC adder block is a plain fuse base with tin-plated copper clips and a glass-filled polycarbonate insulator. If your maintenance crew wants to spot an open fuse without pulling and testing it, that points toward an indicating block.
17) Is a bolt-in block a better choice than a clip-style fuse block for a high-vibration install?
Clip-style blocks like this Mersen adder let you pull and replace fuses by hand, which is faster for maintenance. Where vibration or very high current makes a mechanically captive connection preferable, a bolt-in style such as the Littelfuse LD Series POWR-BLOKS is the alternative. The tradeoff is service time: bolt-in means tools out every fuse change.
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Does the Mersen 30310R come with a warranty?
Absolutely. The Mersen 30310R is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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