Mersen MPDB-66563 Open-Style P...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$520.87
Mersen MPDB-66563 Open-Style Power Distribution Block, Tin-Plated Copper

Mersen MPDB-66563 Open-Style Power Distribution Block, Tin-Plated Copper

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Model: MPDB66591

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

$520.87
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Mersen MPDB-66563 Open-Style Power Distribution Block, Tin-Plated Copper

The Mersen MPDB-66563 Open-Style Power Distribution Block (PDB) provides a safe, code-compliant method of splicing cables, splitting primary power into secondary circuits, and creating fixed junction tap-off points. This block family is available in 1-pole and 3-pole configurations, all built with tin-plated copper connectors and a glass filled polycarbonate body, rated 1000V AC/DC UL and 175A (CU), with a primary wire range of 2/0-#14 and box-type primary and secondary connectors. It meets spacing requirements for feeder and branch circuits per UL508A and the National Electrical Code, and mounts via direct screw mount for straightforward panel installation.

Key Features

  • Pole Configuration: Available in 1-pole or 3-pole versions to suit primary-to-secondary distribution needs.
  • Wire Range (Primary): 2/0-#14 for flexible primary conductor sizing.
  • Ampere Rating: 175A (CU) for reliable primary-to-secondary power distribution.
  • Voltage Rating: 1000V AC UL and 1000V DC UL for demanding industrial applications.
  • Durable Construction: Tin-plated copper connectors housed in a glass filled polycarbonate body for corrosion resistance and dielectric strength.
  • Connector Type: Box-style primary and secondary connectors, 1 opening per pole (primary), for secure box-to-box splicing.
  • Installation Mounting: Direct screw mount for fast, secure panel or enclosure installation.
  • Short Circuit Ratings: 100 kA with Class G, L, T, J fuses at 200A; 100 kA with Class CC and RK5 at 30A; 100 kA with Class RK1 at 100A; 10 kA standalone.
  • Frequency & Current Type: 50/60 Hz, AC/DC operation for broad system compatibility.
  • Hardware: Hex/screw size 3/8-24 x .56 on primary connections with a 0.44 in hole diameter, torqued per Mersen's primary torque schedule.

Certifications & Compliance

  • UL Listed and CSA Approved
  • RoHS Compliant
  • Meets UL508A and National Electrical Code spacing requirements for feeder and branch circuits

Technical Specifications

  • Number of Openings per Pole (Primary): 1
  • ROHS Compliant: Yes
  • Connector Type (Primary): Box
  • Connector Type (Secondary): Box
  • Hole Diameter (Primary): 0.44 in
  • Hex/Screw Size & Type (Primary): 3/8-24 x .56
  • Torque Rating (Primary): 2/0-#3 50; #4-#6 45; #8 40; #10-#14 20
  • Rated Voltage AC UL: 1000 V
  • Rated Voltage DC UL: 1000 V
  • Ampere Rating (CU): 175 A
  • Short Circuit Rating (Class G): 100 kA with 60A Fuse
  • Short Circuit Rating (Class L): 100 kA with 200A Fuse
  • Short Circuit Rating (Class T): 100 kA with 200A Fuse
  • Short Circuit Rating (Class J): 100 kA with 200A Fuse
  • Short Circuit Rating (Class CC): 100 kA with 30A Fuse
  • Short Circuit Rating (Class RK5): 100 kA with 30A Fuse
  • Short Circuit Rating (Class RK1): 100 kA with 100A Fuse

Typical Applications

  • Industrial Control Panel Power Distribution
  • Splicing Feeder and Branch Circuit Cables
  • Splitting Primary Power into Secondary Circuits
  • UL508A Panel Building Applications
  • Commercial and Industrial Electrical Installations

Why Mersen?

Mersen power distribution blocks combine tin-plated copper connectors with a glass filled polycarbonate body to deliver dependable, code-compliant performance for professional electrical work, whether you need the 1-pole or 3-pole MPDB-66563 configuration. With UL and CSA approval, RoHS compliance, and short circuit ratings up to 100 kA across multiple fuse classes, this Open-Style PDB is engineered for safe, reliable power splicing in demanding industrial and commercial environments.

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Manufacturer Resources

Mersen Product Catalog

Product Specs

Rated voltage AC UL:
1000 V
Ampere Rating (CU):
175 A
Short Circuit Rating (Class G):
100 kA with 60A Fuse
Installation Mounting:
Direct Screw Mount
Short Circuit Rating (Class L):
100 kA with 200A Fuse
Hole Diameter (Primary):
0.44 in
Short Circuit Rating (Class T):
100 kA with 200A Fuse
Hex/Screw Size & Type (Primary):
3/8-24 x .56
Short Circuit Rating (Class CC):
100 kA with 30A Fuse
Number of Openings per Pole (Primary):
1
Wire Range (Primary):
2/0-#14
Short Circuit Rating (Class RK5):
100 kA with 30A Fuse
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
Short Circuit Rating (Standalone):
10 kA
AC or DC:
AC/DC
Short Circuit Rating (Class J):
100 kA with 200A Fuse
Connector Material:
Tin-plated Copper
Connector Type (Primary):
Box
Rated voltage DC UL:
1000 V
Connector Type (Secondary):
Box
Short Circuit Rating (Class RK1):
100 kA with 100A Fuse
Torque Rating (Primary):
2/0-#3 50; #4-#6 45; #8 40; #10-#14 20
Body/Insulating Material:
Glass Filled Polycarbonate
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Wiring Devices
Product Type:
Power Distribution Block
Product Material:
Tin-Plated Copper
Voltage Rating:
1000V
Amperage Rating:
175A
Connection Type:
Box
Listing:
UL Listed
Product Subgroup:
Power Distribution

Mersen MPDB66591 – Frequently Asked Questions

1) What wire sizes will the Mersen MPDB-66563 power distribution block accept on the primary?
The primary connectors take 2/0 through #14 conductors, with one opening per pole. They are box-type (set-screw) connectors, so stranded copper landed directly in the box is the intended termination. Torque to Mersen's schedule: 50 in-lb for 2/0 through #3, 45 for #4 through #6, 40 for #8, and 20 for #10 through #14.
2) Do I order the 1-pole or 3-pole Mersen MPDB-66563?
Two configurations are offered. For a three-phase feeder split, order the 3-pole version, MPDB66563. For a single-phase, neutral, or a single conductor you want to tap separately, order the 1-pole, MPDB66591. Electrical ratings are the same either way: 175A copper, 1000V AC and 1000V DC UL. Many panel builders buy three 1-pole blocks when they want phase spacing or staggered mounting instead of a single ganged body.
3) Can this Mersen distribution block be used in a UL508A industrial control panel?
Yes. The MPDB-66563 block is UL Listed and CSA Approved, and it meets UL508A and NEC spacing requirements for feeder and branch circuits, which is what a panel shop needs for the short-circuit current rating calculation. It is also RoHS compliant.
4) What short circuit current rating do I get with this block, and does it need an upstream fuse?
Standalone, the block carries a 10 kA short circuit rating. Protected upstream it goes to 100 kA: with Class J, T, or L fuses at 200A, Class RK1 at 100A, Class G at 60A, and Class CC or RK5 at 30A. If your panel needs a 100 kA SCCR, you have to specify the fuse class and amp rating from that list, not just the block.
5) How does the Mersen MPDB-66563 mount, and what size hardware does it use?
It is a direct screw mount block, so it fastens flat to the panel or sub-plate with screws rather than clipping to DIN rail. On the primary connections the hex/screw size is 3/8-24 x .56 with a 0.44 inch hole diameter. If your panel layout is all DIN rail, plan on a mounting plate.
6) Is this an open-style block or a finger-safe enclosed one?
Open style. The connectors sit exposed in a glass filled polycarbonate body, so it is meant for installation inside an enclosure or behind a dead front where the terminals are not reachable in service. If you need a touch-safe block for an open back panel area, this is not it.
7) Will this handle DC, like a solar or battery circuit?
It is rated for AC and DC operation at 50/60 Hz, with 1000V on both the AC UL and DC UL ratings. That 1000V DC rating is what makes it usable in PV and battery distribution as well as standard industrial AC panels.
8) Will aluminum conductors work in this block?
The ampere rating published for the MPDB-66563 is 175A on copper, and the connectors are tin-plated copper. Size your circuit against the 175A copper figure and land copper conductors in the 2/0 to #14 range.
9) Does the Mersen MPDB-66563 or the Square D 9080LB mount the same way in an enclosure?
The Mersen MPDB-66563 is a direct screw mount block, so it fastens straight to the panel sub-plate or enclosure back pan rather than clipping to DIN rail. Its primary hardware is a 3/8-24 x .56 hex/screw with a 0.44 in hole diameter. The Square D 9080LBA, in the Linergy 9080LB series and offered 1 through 3 pole, should be checked for its own mounting method and hole centers, since reusing existing drilled holes is usually the deciding factor on a retrofit.
10) Can I use this block to splice feeder cable rather than split it into branches?
Yes, straight splicing is one of its intended uses, along with splitting primary power into secondary circuits and creating fixed tap-off points. Both primary and secondary connectors are box type, so it works as a box-to-box splice point as well as a distribution block. Keep the conductors within 2/0 to #14 and inside the 175A copper rating.
How fast can I get the Mersen MPDB66591 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 MPDB66591 come with a warranty?
Absolutely. The Mersen MPDB66591 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 MPDB66591?
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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