Mersen Open-Style Power Distri...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$191.73
Mersen Open-Style Power Distribution Block, UL 1953 1000V Tin-Plated Copper

Mersen Open-Style Power Distribution Block, UL 1953 1000V Tin-Plated Copper

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Model: MPDB66273

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

$191.73
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Mersen Open-Style Power Distribution Block, UL 1953 1000V Tin-Plated Copper

The Mersen Open-Style Power Distribution Block (PDB) is a Next Generation solution for splicing cables, splitting primary power into secondary circuits, and fulfilling fixed junction tap-off requirements. Built with tin-plated copper connectors and rated 1000V AC/DC, this PDB is UL 1953 approved and meets spacing requirements for feeder and branch circuits under UL508A and the National Electrical Code®. It is rated 155A (CU) across 3 poles, with stud-type connectors on both primary and secondary sides for a secure, code-compliant installation.

Key Features

  • Durable Construction: Tin-plated copper connectors housed in a glass-filled polycarbonate body for corrosion resistance and long-term reliability.
  • Ampere Rating: 155A (CU) rated across 3 poles for robust primary-to-secondary power distribution.
  • Voltage Rating: 1000V AC and 1000V DC (UL), supporting AC or DC applications at 50/60 Hz.
  • Connection Type: Stud-style connectors on both primary and secondary, wire range 1/4-20 x 1-5/16, with 1 opening per pole on each side.
  • Installation: Direct screw mount for straightforward panel and enclosure installation.
  • Short Circuit Ratings: Up to 100 kA across Class CC, RK5, RK1, G, J, L, and T fuse classes, with a 10 kA standalone rating.
  • RoHS Compliant: Meets RoHS requirements for restricted substances.

Certifications & Compliance

  • UL 1953 Approved
  • CSA Approved
  • Meets UL508A Spacing Requirements
  • RoHS Compliant

Technical Specifications

  • Number of Openings per Pole (Primary): 1
  • ROHS Compliant: Yes
  • Number of Openings per Pole (Secondary): 1
  • Ampere Rating (CU): 155 A
  • Number of Poles: 3-Pole
  • Connector Material: Tin-plated Copper
  • Body/Insulating Material: Glass Filled Polycarbonate
  • Packaging: 2 EA

Typical Applications

  • Panelboard and Load Center Wiring
  • Splicing and Splitting Primary Power into Secondary Circuits
  • Fixed Junction Tap-Off Points
  • Feeder and Branch Circuit Distribution
  • Commercial and Industrial Electrical Installations

Why Mersen?

Mersen power distribution blocks combine tin-plated copper connectors, a glass-filled polycarbonate body, and UL 1953/CSA approvals to deliver safe, code-compliant power splicing for demanding electrical systems. With short circuit ratings up to 100 kA across multiple fuse classes and RoHS-compliant construction, this PDB is engineered for dependable, long-term performance in professional installations.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Short Circuit Rating (Class CC):
100 kA with 30A Fuse
Number Of Openings Per Pole Primary:
1
Wire Range Primary:
1/4-20 x 1-5/16
Torque Rating Secondary:
stud
ROHS Compliant:
Yes
Short Circuit Rating Class Rk5:
100 kA with 100A Fuse
Frequency (Hz):
50/60 Hz
Rated voltage AC UL:
1000 V
Number Of Poles:
3-Pole
Short Circuit Rating (Standalone):
10 kA
Ampere Rating Cu:
155 A
Short Circuit Rating (Class G):
100 kA with 60A Fuse
AC or DC:
AC/DC
Installation Mounting:
Direct Screw Mount
Wire Range Secondary:
1/4-20 x 1-5/16
Short Circuit Rating Class J:
100 kA with 400A Fuse
Connector Type (Primary):
Stud
Connector Material:
Tin-plated Copper
Short Circuit Rating Class L:
100 kA with 400A Fuse
Rated voltage DC UL:
1000 V
Connector Type Secondary:
Stud
Short Circuit Rating Class T:
100 kA with 400A Fuse
Short Circuit Rating Class Rk1:
100 kA with 200A Fuse
Torque Rating Primary:
stud
Number Of Openings Per Pole Secondary:
1
Body/Insulating Material:
Glass Filled Polycarbonate
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Power Distribution
Product Type:
Power Distribution Block
Product Subgroup:
Power Distribution Blocks

Mersen MPDB66273 – Frequently Asked Questions

1) Can the Mersen MPDB66273 power distribution block be used on a 1000V DC solar or battery circuit?
Yes. The MPDB66273 is UL rated 1000V AC and 1000V DC, and the spec sheet lists it as AC/DC at 50/60 Hz, so it works on either a DC string circuit or an AC feeder at full 1000V.
2) Does the Mersen MPDB66273 take wire lugs or bare conductors?
It is a stud-type block on both primary and secondary, with a 1/4-20 x 1-5/16 stud and one opening per pole on each side. You land ring or spade terminal lugs over the studs rather than stripping conductors into a set screw barrel, so crimp lugs sized to a 1/4 inch bolt hole need to be on the cable ends before you get to the block.
3) How many circuits can I tap off the Mersen MPDB66273 block?
One per phase. The block is 3-pole with a single opening per pole on the primary and a single opening per pole on the secondary, so it is a one-in, one-out splice or junction point per phase, not a multi-tap distribution block. If you need to split one feeder into several branch circuits, you need a block with multiple secondary openings per pole.
4) What short circuit current rating can I use for my UL 508A panel label with this Mersen block?
It depends on what protects it. Standalone the MPDB66273 is rated 10 kA. Fused, it goes to 100 kA: Class CC with a 30A fuse, Class G with 60A, Class RK5 with 100A, Class RK1 with 200A, and Classes J, L and T with up to 400A. For a 100 kA SCCR on the panel label the upstream fuse has to be within those class and amp limits.
5) Is 155A the limit on this Mersen distribution block, and does that cover a 150A feeder?
The amp rating is 155A with copper conductors, so a 150A copper feeder is within rating. Aluminum conductors are a different case, since the published rating is the copper figure only.
6) Is this open-style block safe to use where it can be touched, or do I need a finger-safe block?
Open style means the stud connections are exposed, so the MPDB66273 belongs inside an enclosure, panelboard or load center where the dead front provides the barrier. If technicians will work near energized terminals with the cover off, specify a closed or finger-safe cover style block instead.
7) How does the Mersen MPDB66273 mount in an enclosure?
Direct screw mount. The body fastens straight to the panel or enclosure backplate, so you need tapped holes or self-tappers in the subpanel rather than DIN rail. The housing is glass-filled polycarbonate with tin-plated copper connectors.
8) What approvals does the Mersen open-style PDB carry for an inspected commercial job?
It is UL 1953 approved and CSA approved, meets UL 508A spacing requirements for feeder and branch circuits, and is RoHS compliant. That is the combination an inspector looks for on a panelboard splice block.
9) Will tin-plated copper connectors hold up in a damp or corrosive industrial panel?
Tin plating over the copper connectors is there for corrosion resistance, and the body is glass-filled polycarbonate rather than a filled phenolic. For MRO stocking in humid plant or coastal environments that is the plating you want, though the block itself still needs to sit in an enclosure rated for the location.
10) Does the Mersen MPDB66273 come as a single block or a pair?
Packaging is 2 each, so one order quantity brings two blocks. Worth knowing if you are pricing a job that needs an odd count.
How fast can I get the Mersen MPDB66273 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 MPDB66273 come with a warranty?
Absolutely. The Mersen MPDB66273 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 MPDB66273?
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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