Mersen 60600 Class H/K Adder B...
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Mersen 60600 Class H/K Adder Box Fuse Block, 60A 250VAC/250VDC

Mersen 60600 Class H/K Adder Box Fuse Block, 60A 250VAC/250VDC

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Model: 20-600

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

$24.00
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Mersen 60600 Class H/K Adder Box Fuse Block, 60A 250VAC/250VDC

The Mersen 60600 Class H/K Adder Box Fuse Block is engineered to accept Class H and K power fuses rated 250VAC/250VDC, with a snap-on adder design that attaches to 1-, 2-, or 3-pole blocks to build multipole segmented assemblies of virtually any pole count. This model is part of a broader Mersen adder box fuse block platform available across Model options from 20-600 through 60600, letting electricians standardize on the same construction and mounting method across a range of maximum fuse ratings. The 60600 carries a 60A maximum fuse rating, a 50 kA short circuit current rating (SCCR) for demanding industrial and commercial power distribution, and insulating components molded from glass-filled polycarbonate for verified dielectric strength. Fuse clips are high-conductivity tinplated copper for dependable, low-resistance connections.

Key Features

  • Amperage Rating: 60A maximum fuse rating for reliable overcurrent protection.
  • Voltage Rating: Rated 250VAC/250VDC (AC/DC) at 50/60 Hz for versatile power applications.
  • Fuse Class: Accepts Class H/K power fuses via a clip-in installation method.
  • Adder Box Configuration: Snaps onto 1-, 2-, or 3-pole blocks to form multipole segmented fuse block assemblies; the Mersen platform spans Model options from 20-600 through 60600.
  • Short Circuit Current Rating: 50 kA SCCR supports demanding fault-current environments.
  • Durable Construction: Body and insulating material is glass-filled polycarbonate with high dielectric strength.
  • Mounting: Direct screw mount installation with a 45 lb-in torque rating for secure, code-compliant termination.
  • High-Conductivity Clips: Tinplated copper fuse clips ensure consistent, low-resistance contact.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Number of Poles: Adder
  • Fuse Type/Class: Class H/K
  • Short Circuit Current Rating (SCCR): 50 kA
  • Installation Mounting: Direct Screw Mount
  • Max Fuse Rating: 60 A
  • Torque Rating: 45 lb-in
  • Ampere Rating: 60 A
  • ROHS Compliant: Yes
  • Frequency (Hz): 50/60 Hz
  • AC or DC: AC/DC
  • Fuse Installation Method: Clip-in
  • Body/Insulating Material: Glass Filled Polycarbonate
  • Packaging: 10 EA

Typical Applications

  • Commercial and Industrial Power Distribution Panels
  • Motor Control Centers and Switchboards
  • Multipole Segmented Fuse Block Assemblies
  • Class H/K Fused Disconnect and Protection Systems
  • Panelboard and Load Center Overcurrent Protection

Why Mersen?

Mersen builds its Class H/K adder box fuse blocks with glass-filled polycarbonate insulators for verified dielectric strength, high-conductivity tinplated copper clips, and a 50 kA SCCR to deliver dependable, code-compliant overcurrent protection. The snap-on adder design gives electrical professionals a flexible way to configure multipole fuse block assemblies across the 20-600 through 60600 Model range without sacrificing build quality or reliability.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Number of Poles:
Adder
Fuse Type/Class:
Class H/K
Short Circuit Current Rating (SCCR):
50 kA
Installation Mounting:
Direct Screw Mount
Max Fuse Rating:
60 A
Fuse Class:
Class H/K
Torque Rating:
45 lb-in
Ampere Rating:
60 A
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
AC or DC:
AC/DC
Fuse Installation Method:
Clip-in
Body/Insulating Material:
Glass Filled Polycarbonate
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fuse Block
Product Material:
Glass Filled Polycarbonate
Voltage Rating:
250VAC/250VDC
Amperage Rating:
60A
Configuration:
Adder Box
Standards:
RoHS
Product Subgroup:
Fuse Holders & Blocks

Mersen 20-600 – Frequently Asked Questions

1) What is an adder box fuse block, and can the Mersen 60600 be used by itself?
An adder box is not a standalone block. The Mersen 60600 is an adder configuration that snaps onto an existing 1-, 2-, or 3-pole Class H/K block to build a multipole segmented assembly of whatever pole count the panel needs. If you need a complete one-, two-, or three-pole fused block, order the base block and add this on top of it for each extra pole.
2) Will the Mersen 60600 accept Class R or Class J fuses?
No. The 60600 is clipped for Class H and Class K power fuses only, rated 250VAC/250VDC. Class R rejection-style fuses and Class J fuses use different dimensions and mounting, so they will not seat in these clips. If your drawing calls for Class R, the Littelfuse LFR60030-3CID Class R fuse block is the right family instead.
3) Can I use the Mersen 60600 fuse block on a 480V circuit?
No. It is rated 250VAC/250VDC, so it is limited to 250 volt nominal systems such as 120/240V and 240V three-phase. For 480V or 600V distribution you need a 600V-rated block, for example the Littelfuse LFR60030-3CID at 600V 30A or the Littelfuse LFG60015-1SQDINR Class G block at 600V 15A, both of which are different fuse classes.
4) What is the largest fuse amperage the Mersen 60600 will take?
60 amps is the maximum fuse rating. Any Class H or K fuse up to 60A in the 250V dimension will clip in. Running a larger fuse is not an option; step up to a higher-rated block in the same adder platform if the circuit needs more than 60A.
5) Does this Mersen fuse block meet a 50 kA SCCR requirement on a motor control panel?
It carries a 50 kA short circuit current rating, which covers most industrial MCC and switchboard fault-current requirements at 250V. The overall panel SCCR is still set by the lowest-rated component in the assembly, so the block itself will not be the limiting factor at 50 kA.
6) What should I use instead of the Mersen 60600 adder box if the panel is fused with Class R instead of Class H/K?
The Mersen 60600 accepts Class H/K power fuses with a clip-in installation method, so it is not the block for a Class R fuse. For a Class R opening at 600V, the Littelfuse LFR60030-3CID is a Class R fuse block rated 600V 30A. Confirm the fuse class stamped on the fuse body before choosing, since Class R fuses carry a rejection feature the Class H/K clip arrangement does not address.
7) Is there a DIN rail mount alternative to the Mersen 60600 fuse block?
The Mersen 60600 installs by direct screw mount with a 45 lb-in termination torque, so it fastens to a panel subplate rather than clipping to rail. If the enclosure is laid out on DIN rail, the Littelfuse LFG60015-1SQDINR is a DIN rail mount block, though it is a Class G block rated 600V 15A rather than Class H/K at 60A. That change in fuse class and ampere rating has to be carried through to the fuse selection, not just the mounting.
8) I need a fixed two-pole block, not an adder. What are my options versus the Mersen 60600?
The Mersen 60600 is an adder box that snaps onto an existing 1-, 2-, or 3-pole block, so ordering it alone will not give you a standalone two-pole assembly. For a self-contained two-pole module, the Bussmann BCM603 Series is a two-pole modular fuse block, and the Bussmann CHCC2DIU is a 2-pole Class CC modular block with a finger-safe cover and indicator. Verify the fuse class each accepts matches the fuses already specified for the panel.
9) The Mersen 60600 is rated 250VAC/250VDC. What do I use for a higher DC voltage like a solar array?
The Mersen 60600 is rated 250VAC/250VDC for AC/DC service at 50/60 Hz, which does not cover high-voltage photovoltaic strings. For PV, the Bussmann CHPV2 Series is a modular two-pole photovoltaic fuse block rated 1000 Vdc. Match the block's DC voltage rating to the array's maximum system voltage rather than to its operating voltage.
10) How does the Mersen 60600 mount, and what torque should the terminals be tightened to?
Direct screw mount to the panel or subpanel surface, not DIN rail. Terminal torque is 45 lb-in. If your build standardizes on DIN rail, the Littelfuse LFG60015-1SQDINR is a DIN rail mount block, and the Littelfuse LD Series POWR-BLOKS are bolt-in.
11) What is the difference between the Mersen 60600 adder box and the Littelfuse LD Series POWR-BLOKS?
The two differ in how they attach to the panel and how pole count is built up. The Mersen 60600 is an adder box configuration that snaps onto 1-, 2-, or 3-pole blocks to build segmented multipole assemblies, and it fastens by direct screw mount. The Littelfuse LD Series POWR-BLOKS uses bolt-in mounting. If your drawing calls out bolt-in blocks, the LD Series matches that method; if you are extending an existing Mersen segmented stack to a higher pole count, the 60600 adder is the piece that does it.
12) Is a Bussmann 3833 Series AGC block an alternative to the Mersen 60600?
They serve different ends of the amperage range. The Bussmann 3833 Series takes AGC glass-tube fuses and comes in 1 to 8-pole configurations, which suits control and low-current circuits. The Mersen 60600 carries a 60A maximum fuse rating and a 50 kA short circuit current rating for power distribution duty with Class H/K power fuses. If the circuit is a motor branch or feeder rather than a control leg, the 60600's fuse class and SCCR are the relevant specs.
13) Which fuse block should I standardize on across a plant if I want finger-safe covers and blown fuse indication?
The Mersen 60600 is built with glass-filled polycarbonate insulating components and tinplated copper clips and is RoHS compliant, with a 50 kA SCCR, but it is specified as an open adder box on the Class H/K platform. If finger-safe construction and a blown-fuse indicator are a facility standard, the Bussmann CHCC2DIU is a 2-pole Class CC modular block that is finger-safe with an indicator. Standardizing on indication usually means standardizing on fuse class as well, so decide the class first and the feature set second.
14) What is the Mersen 60600 fuse block body made of, and will it hold up in a hot industrial enclosure?
The body and insulating components are glass-filled polycarbonate, chosen for dielectric strength, and the fuse clips are tinplated copper for low-resistance contact. That is the standard construction for enclosed power distribution and motor control duty.
15) Is the Mersen 60600 RoHS compliant for a government or institutional spec?
Yes, it is RoHS compliant, which is the standard called out for the block.
How fast can I get the Mersen 20-600 delivered?
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Can I return it if it doesn’t work for me?
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Does the Mersen 20-600 come with a warranty?
Absolutely. The Mersen 20-600 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 20-600?
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