Mersen P243G 1-Pole Stud-Mount...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$232.96
Mersen P243G 1-Pole Stud-Mount Fuse Block, Semiconductor

Mersen P243G 1-Pole Stud-Mount Fuse Block, Semiconductor

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Model: P243G

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

$232.96
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Mersen P243G 1-Pole Stud-Mount Fuse Block, 1000VAC/1000VDC Semiconductor

The Mersen P243G is a 1-Pole stud-mount fuse block engineered for Class 101 semiconductor bolt-in fuses, rated 1000VAC / 1000VDC with a Short Circuit Current Rating (SCCR) of 10 kA. This fuse block is offered with a selectable Motor FLA option spanning 400A to 600A, allowing it to be matched to the current-handling requirements of the connected power conversion or motor drive circuit. Built with a glass-filled polycarbonate or laminated phenolic insulator body, the P-Block uses tin-plated copper stud terminals for a secure, low-resistance connection and is direct screw mounted for panel or enclosure installation. It is designed for demanding power conversion, motor drive, and industrial control applications where reliable semiconductor fuse protection at high voltage is required.

Key Features

  • Motor FLA Range: Available in 400A and 600A configurations to match the full-load amperage of the protected circuit.
  • Fuse Type/Class: Configured for Class 101 semiconductor bolt-in fuses for precise overcurrent protection.
  • Durable Construction: Glass-filled polycarbonate or laminated phenolic insulating body resists heat and mechanical stress.
  • 1-Pole Configuration: Single-pole stud design accommodates one bolt-in fuse per block.
  • Stud Connection: Tin-plated copper stud terminals provide a durable, low-resistance electrical connection.
  • Dual Voltage Rating: Rated 1000VAC and 1000VDC (UL) for use across AC and DC semiconductor protection circuits, 50/60 Hz.
  • Short Circuit Current Rating: 10 kA SCCR supports protection in higher fault-current applications.
  • Direct Screw Mount: Simplifies installation directly to panels or equipment enclosures.
  • Plated Hardware: All studs, clips, and mounting hardware are tin- or zinc-plated for corrosion resistance.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Rated Voltage AC (UL): 1000 V
  • Rated Voltage DC (UL): 1000 V
  • Motor FLA Options: 400A, 600A
  • ROHS Compliant: Yes

Typical Applications

  • Semiconductor Fuse Protection Circuits
  • Power Conversion and Rectifier Equipment
  • Motor Drive and Variable Frequency Drive Panels
  • Industrial Control Panels
  • High-Voltage AC/DC Distribution Assemblies

Why Mersen?

Mersen fuse blocks pair a rugged phenolic or glass-filled polycarbonate insulating body with tin-plated copper stud terminals to deliver dependable, code-compliant semiconductor fuse protection for demanding electrical environments. With a 1000VAC/1000VDC rating, 10 kA SCCR, a Motor FLA range of 400A to 600A, and RoHS-compliant construction, this Mersen P-Block fuse block is built for professionals who need consistent, reliable performance in industrial and power conversion installations.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Rated voltage AC UL:
1000 V
Number Of Poles:
1-Pole
Fuse Type Class:
Semiconductor
Short Circuit Current Rating Sccr:
10 kA
Installation Mounting:
Direct Screw Mount
Connection Terminal Type:
Stud
Connection/Terminal Material:
Tin-Plated Copper
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
AC or DC:
AC/DC
Fuse Installation Method:
Bolt-in
Rated voltage DC UL:
1000 V
Body/Insulating Material:
Phenolic
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fuse Block
Product Material:
Glass-Filled Polycarbonate
Configuration:
1-Pole
Voltage Rating:
1000VAC/1000VDC
Amperage Rating:
400A - 600A
Product Finish:
Tin-Plated
Standards:
RoHS Compliant
Product Subgroup:
Fuse Holders & Blocks

Mersen P243G – Frequently Asked Questions

1) Will the Mersen P243G fuse block take a standard ferrule or clip-style fuse?
No. The P243G is built for bolt-in semiconductor fuses only. It uses tin-plated copper stud terminals and the fuse bolts down to those studs, so a ferrule or knife-blade clip fuse will not mount. If your fuse has ferrule ends, you need a clip-style holder instead, not this block.
2) Can I use the Mersen P243G on a 1000 VDC solar or rectifier circuit, or is it AC only?
Both. The P243G carries a UL rated voltage of 1000 V AC and 1000 V DC, at 50/60 Hz on the AC side, so it works in DC link, rectifier, and power conversion circuits as well as AC drive panels. Short circuit current rating is 10 kA.
3) What is the difference between the Mersen P243G and the P266A fuse block?
They are the same single-pole stud-mount semiconductor block in two current sizes. Order P243G for a 600A motor full-load amperage circuit and P266A for 400A. Both are rated 1000VAC/1000VDC with a 10 kA SCCR, so the choice comes down to the FLA of the circuit you are protecting.
4) Do I need three of these blocks for a three-phase drive panel?
Yes. The P243G is a 1-pole block, one bolt-in fuse per block, so a three-phase feeder takes three of them mounted side by side. Each is direct screw mounted to the panel or enclosure backplate, so you set the pole spacing yourself rather than being fixed by a molded multi-pole body.
5) What is the closest alternative to the Mersen P243G fuse block for bolt-in power fuses?
The Littelfuse LD Series POWR-BLOKS fuse block is the nearest peer, since it also uses bolt-in mounting rather than clip-in fuse retention. The Mersen P243G takes Class 101 semiconductor bolt-in fuses on 1-pole stud terminals of tin-plated copper, rated 1000VAC/1000VDC with a 10 kA SCCR, so confirm the LD block's fuse class and voltage match your fuse before substituting.
6) For a 1000 Vdc solar string circuit, should I use the Mersen P243G or a Bussmann CHPV2 block?
The Bussmann CHPV2 Series block is a modular two-pole photovoltaic block rated 1000 Vdc, intended for PV string protection. The Mersen P243G is a 1-pole stud-mount block for Class 101 semiconductor bolt-in fuses, rated 1000VAC/1000VDC and aimed at power conversion, rectifier, and motor drive circuits. For a two-pole PV string the CHPV2 matches the application; for semiconductor fuse protection in a drive or rectifier panel the P243G is the one configured for it.
7) What else could I use instead of the Mersen P-Block for bolt-in power fuses?
The closest alternative in the same mounting style is the Littelfuse LD Series POWR-BLOKS block, which also uses bolt-in mounting. Class R and Class CC modular blocks such as the Littelfuse LFR60030-3CID or the Bussmann CHCC2DIU are a different thing entirely: those take branch-circuit fuse classes, not Class 101 semiconductor bolt-in fuses, and will not protect a rectifier or drive the way a semiconductor fuse does.
8) Is a 10 kA SCCR enough for my industrial panel?
The P243G is rated 10 kA SCCR, so the available fault current at the point of installation has to be at or below that. On large services fed by a big transformer, available fault current often exceeds 10 kA, and in that case you need upstream current limiting or a higher-rated assembly. Check the fault current calculation for your panel before you commit to this block.
9) I need a DIN rail mounted fuse block, not a panel-mount one. What are my options?
The Littelfuse LFG60015-1SQDINR is a Class G fuse block rated 600V 15A with DIN rail mounting. The Mersen P243G mounts by direct screw to a panel or enclosure surface and is not a rail-mount device, so if your assembly is built on DIN rail the LFG60015 style block fits the rail directly while the P243G needs a drilled panel or subplate.
10) What should I use instead of the Mersen P243G for small low-current control or automotive fuses?
The Bussmann 3833 Series AGC fuse block covers 1 to 8-pole configurations for AGC glass-tube fuses, and the Bussmann BCM603 Series is a two-pole modular block. Both suit low-current control wiring, while the Mersen P243G is a single-pole block with a 400A to 600A motor FLA range and tin-plated copper studs sized for bolt-in semiconductor fuses.
11) I need two or three poles of protection. Is the Mersen P243G the right block?
The P243G is a 1-pole block accepting one bolt-in fuse per block, so a multi-pole circuit needs either multiple blocks or a multi-pole design. Multi-pole peers include the Bussmann CHCC2DIU at two poles, the Bussmann BCM603 Series at two poles, and the Bussmann 3833 Series in 1 to 8-pole configurations, though each is built for a different fuse class than the P243G's Class 101 semiconductor bolt-in fuses.
12) Which fuse block should I pick if I need a finger-safe design with a blown fuse indicator?
The Bussmann CHCC2DIU is the finger-safe Class CC block with an indicator among the comparable blocks. The Mersen P243G is an open stud-mount design with tin-plated copper studs and a phenolic or glass-filled polycarbonate insulating body, direct screw mounted, so touch-safe shrouding comes from the enclosure rather than the block itself.
13) Is the body on this Mersen fuse block able to handle the heat inside a drive cabinet?
The insulating body is phenolic or glass-filled polycarbonate, both chosen to resist heat and mechanical stress in enclosed panels. The current path is tin-plated copper for a low-resistance joint, and studs, clips, and mounting hardware are plated for corrosion resistance, which matters in humid or industrial environments.
14) Does the Mersen P243G meet RoHS for an export control panel build?
Yes, the P243G is RoHS compliant, which covers the restricted-substance requirement most OEM panel builds and institutional specs call out. On the electrical side the published UL ratings are 1000 V AC and 1000 V DC with a 10 kA short circuit current rating.
How fast can I get the Mersen P243G 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 P243G come with a warranty?
Absolutely. The Mersen P243G 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 P243G?
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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