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Mersen 70308 3-Pole Semiconductor Fuse Block, 750VAC/750VDC 30A
Model: MER-70308
Mersen 70308 3-Pole Semiconductor Fuse Block, 750VAC/750VDC 30AThe Mersen 70308 3-Pole Semiconductor Fuse Block delivers dependable circuit protection for demanding semiconductor applications with...
Mersen
$176.94
$138.37
Mersen 70306 30A 1-Pole Fuse Block, 750VAC/750VDC Screw Mount
The Mersen 70306 is a 30A 1-Pole fuse block engineered for reliable overcurrent protection in both AC and DC circuits, backed by a dual 750VAC/750VDC voltage rating. Built with a thermoplastic body for durable electrical isolation, this fuse block uses a clip-in fuse installation method combined with a direct screw mount terminal for secure, low-maintenance connections. A 200 kA short circuit current rating (SCCR) gives this block exceptional fault-current interruption capability for demanding professional electrical work.
Key Features
- 30A Current Rating: Handles substantial electrical loads while delivering precise overcurrent protection for critical circuits.
- 750VAC/750VDC Dual Rating: Versatile voltage compatibility supports both alternating and direct current applications from a single terminal block.
- 200 kA Short Circuit Current Rating: Exceptional fault current interruption capability ensures reliable protection under extreme electrical fault conditions.
- Thermoplastic Construction: Durable insulating material provides excellent electrical isolation and long-term reliability in demanding environments.
- Clip-in Fuse Installation: Quick, secure fuse mounting system enables efficient installation and replacement without tools.
- Direct Screw Mount Design: Robust mounting method ensures stable mechanical connection and reliable electrical contact.
- 1-Pole Configuration: Single-pole design suited to dedicated circuit protection applications.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- Rohs Compliant: Yes
Typical Applications
- Industrial Control Panels and Motor Control Centers
- Commercial Electrical Distribution Systems
- Renewable Energy and Solar Power Systems
- DC Power Supply and Battery Management Systems
- Process Control and Automation Equipment
- Telecommunications and Data Center Infrastructure
Why Mersen?
Mersen fuse blocks deliver proven reliability through thermoplastic construction and RoHS compliant materials, backed by a robust 200 kA short circuit current rating for demanding professional applications. The 30A, 1-Pole, 750VAC/750VDC design with clip-in fuse installation and direct screw mount terminal gives electrical professionals a dependable, code-conscious choice for circuit protection across AC and DC systems.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Product Type:
- Fuse Block
- Product Material:
- Thermoplastic
- Voltage Rating:
- 750VAC/750VDC
- Amperage Rating:
- 30A
- Configuration:
- 1-Pole
- Standards:
- RoHS Compliant
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuse Holders & Blocks
- Product Weight:
- 0.12 lb
- Product Length:
- 3 in
- Product Width:
- 1.06 in
- Product Height:
- 1.37 in
- Number Of Poles:
- Single-pole
Mersen 70306 – Frequently Asked Questions
1) Can the Mersen 70306 fuse block be used on a DC circuit, like a solar array or battery bank?
Yes. The 70306 carries a dual 750VAC/750VDC rating, so the same block works on AC branch circuits and on DC systems such as PV strings, battery management, and DC power supplies. Many fuse blocks are AC-only, so the DC number is the one to check when you are specifying for a solar or battery job.
2) What size fuse does the Mersen 70306 block take, and how many circuits does it protect?
It is a 1-pole block rated 30A, so it holds one fuse and protects a single circuit. For a three-phase feeder you would need three of them, or a multi-pole block instead.
3) Does the Mersen 70306 mount on DIN rail?
No. The 70306 is a direct screw mount block, bolted to the panel subplate or backpan rather than clipped to rail. If your panel is laid out on DIN rail, look at a rail-mount block instead, such as the Littelfuse LFG60015-1SQDINR Class G block.
4) What is a comparable 30A fuse block if the Mersen 70306 is not the right fit for a 600V Class R application?
The Littelfuse LFR60030-3CID is a Class R fuse block rated 600V at 30A, in a three-pole arrangement. The Mersen 70306 is a 1-pole block carrying a dual 750VAC/750VDC rating, so the two differ in both pole count and the voltage class they are built around. If the panel schedule calls for Class R fuses at 600V across three phases, the LFR60030-3CID matches that description; if the circuit is a single dedicated pole and includes DC duty, the 70306 covers both AC and DC at 750V.
5) Can I use the Mersen 70306 on a 1000V solar string, or do I need a different block?
The Mersen 70306 carries a 750VAC/750VDC rating, so a PV string above that voltage is outside its rating. For higher-voltage photovoltaic work, the Bussmann CHPV2 series is a modular two-pole photovoltaic fuse block rated 1000 Vdc. The Mersen 70306 remains a single-pole block, so on a system within 750VDC it protects one conductor per block, while the CHPV2 is arranged as a two-pole module.
6) I need a fuse block that snaps onto DIN rail instead of screwing to a subpanel - what should I order?
The Mersen 70306 uses a direct screw mount, so it fastens to a panel surface rather than clipping to rail. For a DIN rail installation, the Littelfuse LFG60015-1SQDINR is a DIN rail mount Class G fuse block rated 600V at 15A. Note the amperage difference: the Mersen 70306 is a 30A block, while the LFG60015-1SQDINR is rated 15A, so it is a rail-mount alternative only where the circuit load suits 15A.
7) Is 200 kA SCCR enough for an industrial control panel short circuit current rating?
The 70306 is rated 200 kA SCCR, which is the highest commonly published value for fuse-protected panel components, so the block itself will not be the limiting element in your panel SCCR calculation. The overall panel rating still depends on the lowest-rated component in the current path.
8) How is the fuse held in the Mersen 70306, and can it be changed without tools?
Fuses clip in. The 70306 uses a clip-in fuse installation method, so a ferrule fuse pushes into the spring clips and pulls back out for replacement without disassembling the block. The wire terminations are screw type and stay put when you swap the fuse.
9) What is the difference between the Mersen 70306 and a Littelfuse POWR-BLOKS LD block?
The Littelfuse LD Series POWR-BLOKS is a bolt-in mounting fuse block, meaning the fuse is secured by bolted connections rather than dropped into clips. The Mersen 70306 uses clip-in fuse installation with a direct screw mount terminal, so fuse changes are made by hand without unbolting the fuse body. Choose based on how the fuses in the panel are terminated: bolt-in fuse bodies need the LD block, clip-style fuses need a block like the 70306.
10) Does a Littelfuse Class G block substitute for the Mersen 70306 in a DC circuit?
It is not a like-for-like swap. The Littelfuse LFG60015-1SQDINR is described as a 600V 15A Class G block, while the Mersen 70306 is a 30A block carrying a dual 750VAC/750VDC rating that covers direct current as well as AC. For DC power supply, battery management, or solar circuits where the Mersen 70306 is specified, confirm the replacement block carries an explicit DC rating for your system voltage rather than assuming an AC-rated Class G block will serve.
11) What is the Mersen 70306 body made of, and does it hold up in a hot control panel?
The body is thermoplastic, chosen for electrical isolation between the live clips and the mounting surface in enclosed panel work. It is also RoHS compliant, which matters if you are supplying into a spec that requires it.
12) I need a bolt-in fuse block instead of a screw-mount one. What else do you carry?
The Littelfuse LD Series POWR-BLOKS block uses bolt-in mounting, which is the usual choice where the connection has to take vibration or high mechanical load. The Mersen 70306 is a direct screw mount design, fastened to the panel surface.
13) What is the Mersen part number to order for this fuse block?
Order Mersen 70306. That is the manufacturer part number for the 30A single-pole, 750VAC/750VDC screw mount block, and it is the only configuration sold under it.
How fast can I get the Mersen 70306 delivered?
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Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
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Does the Mersen 70306 come with a warranty?
Absolutely. The Mersen 70306 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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