Mersen MPDB69143 Open-Style Po...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$662.60
Mersen MPDB69143 Open-Style Power Distribution Block, 3-Pole 620A Tin-Plated Aluminum

Mersen MPDB69143 Open-Style Power Distribution Block, 3-Pole 620A Tin-Plated Aluminum

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Model: MPDB69143

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

$662.60
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Mersen MPDB69143 Open-Style Power Distribution Block, 3-Pole 620A Tin-Plated Aluminum

The Mersen MPDB69143 open-style power distribution block delivers dependable high-current power distribution for demanding industrial and commercial electrical systems. This 3-pole distribution block is rated 620A copper and 1000V AC/DC, combining tin-plated aluminum connectors with a glass-filled polycarbonate insulating body for durable, code-compliant performance. UL 1953 listed with a 100 kA short circuit rating when properly fused, this block is engineered for multi-circuit power distribution applications requiring flexible wire range accommodation and organized three-phase connection management.

Key Features

  • 620A Copper Rating: High current capacity supports demanding electrical loads with reliable power distribution performance.
  • 1000V AC/DC Rating: Versatile voltage capability accommodates both AC and DC applications up to 1000V for flexible system integration.
  • 3-Pole Configuration: Three-pole design provides complete three-phase power distribution with organized connection management.
  • Tin-Plated Aluminum Connectors: Corrosion-resistant tin plating on the primary and secondary box connectors ensures long-term connection reliability and reduced maintenance requirements.
  • Glass-Filled Polycarbonate Body: High-strength insulating material provides excellent electrical isolation and mechanical durability.
  • Flexible Wire Range: Primary wire range of 350-#6 and secondary wire range of #4-#14 accommodate a variety of feeder and branch conductor sizes.
  • 100 kA Short Circuit Rating: High fault current capability with appropriate Class CC, G, J, L, RK1, RK5, or T fusing provides robust system protection.
  • Direct Screw Mount Installation: Simplifies mounting into panelboards and distribution enclosures.

Certifications & Compliance

  • UL 1953 Listed
  • RoHS Compliant

Technical Specifications

  • Connector Type Primary: Box
  • Connector Type Secondary: Box
  • Number Of Openings Per Pole Primary: 2
  • Number Of Openings Per Pole Secondary: 12
  • Rohs Compliant: Yes

Typical Applications

  • Industrial Power Distribution Systems
  • Commercial Electrical Panels
  • Manufacturing Facility Power Management
  • Data Center Power Distribution
  • Heavy Equipment Power Feeds
  • Multi-Circuit Distribution Applications

Why Mersen?

Mersen power distribution blocks combine proven engineering with UL 1953 listing and RoHS compliance for reliable electrical distribution solutions. The robust glass-filled polycarbonate construction and tin-plated aluminum connectors help ensure long-term performance in demanding professional applications, backed by a 100 kA short circuit rating when properly fused.

Manufacturer Resources

Product Specs

Ac Or Dc:
AC/DC
Ampere Rating Al :
500 A
Ampere Rating Cu :
620 A
Body Insulating Material:
Glass Filled Polycarbonate
Connector Material:
Tin-plated Aluminum
Connector Type Primary :
Box
Connector Type Secondary :
Box
Frequency Hz :
50/60 Hz
Hex Screw Size Type Primary :
11/16-16 x .88
Hex Screw Size Type Secondary :
5/16-24 x .38
Hole Diameter Primary :
0.75 in
Hole Diameter Secondary :
0.27 in
Installation Mounting:
Direct Screw Mount
Number Of Openings Per Pole Primary :
2
Number Of Openings Per Pole Secondary :
12
Number Of Poles:
3-Pole
Product Height:
3.55 in
Product Length:
5.7 in
Product Weight:
5.4 lb
Product Width:
7.89 in
Rated Voltage Ac Ul:
1000 V
Rated Voltage Dc Ul:
1000 V
Rohs Compliant:
Yes
Short Circuit Rating Class Cc :
100 kA with 30A Fuse
Short Circuit Rating Class G :
100 kA with 60A Fuse
Short Circuit Rating Class J :
100 kA with 600A Fuse
Short Circuit Rating Class L :
100 kA with 800A Fuse
Short Circuit Rating Class Rk1 :
100 kA with 600A Fuse
Short Circuit Rating Class Rk5 :
100 kA with 600A Fuse
Short Circuit Rating Class T :
100 kA with 800A Fuse
Short Circuit Rating Standalone :
10 kA
Torque Rating Primary :
350-#6 275
Torque Rating Secondary :
#4-#8 40; #10-#14 35
Wire Range Primary :
350-#6
Wire Range Secondary :
#4-#14
Department:
Electrical
Product Group:
Wiring Devices
Product Type:
Power Distribution Block

Mersen MPDB69143 – Frequently Asked Questions

1) What wire sizes can I land on the Mersen MPDB69143 power distribution block?
The primary (line) side takes 350 kcmil down to #6, with two openings per pole. The secondary (load) side takes #4 down to #14, with twelve openings per pole. So one feeder pair per phase in, up to twelve branch conductors per phase out. Both sides use box connectors.
2) Is the MPDB69143 rated 620A if I'm feeding it with aluminum conductors?
No. 620A is the copper rating. On aluminum conductors the block is rated 500A. Size the feeder and the upstream overcurrent device to whichever conductor material you are actually pulling.
3) What is the short circuit current rating on this Mersen distribution block, and does it need fusing?
Standalone SCCR is 10 kA. To get 100 kA you have to protect it with the right fuse class and size: Class CC with a 30A fuse, Class G with 60A, Class J with 600A, Class RK1 or RK5 with 600A, and Class L or T with 800A. If your panel SCCR target is 100 kA, the fuse ahead of the block is not optional.
4) What torque values do I use on the MPDB69143 lugs?
Primary side, 350 kcmil through #6, is 275 in-lb. Secondary side splits by conductor size: #4 through #8 at 40 in-lb, #10 through #14 at 35 in-lb. Primary hex screws are 11/16-16 x .88, secondary are 5/16-24 x .38, so bring both driver sizes to the panel.
5) Will the Mersen MPDB69143 fit in my enclosure?
Footprint is 7.89 in wide by 5.7 in long by 3.55 in high, and it weighs 5.4 lb. It is an open-style block with no cover, so plan clearance around live parts as well as the physical envelope. Mounting is direct screw mount into the panel or enclosure backplate.
6) Can I substitute a block based only on it being 3-pole, like the Square D Linergy 9080LB?
Pole count alone is not enough to make a block interchangeable. The Square D Linergy 9080LB is a 3-pole distribution block, but a valid swap for the Mersen MPDB69143 also has to match the electrical and mechanical envelope: 620 A copper, 1000 V AC/DC at 50/60 Hz, a 10 kA standalone short circuit rating that rises to 100 kA when protected by Class J or RK1 fusing at 600 A, and a direct screw mount footprint of 7.89 in wide by 5.7 in long by 3.55 in high. Verify those four things - ampacity, voltage, SCCR with your fuse class, and enclosure fit - before treating any 3-pole block as an equivalent.
7) Can I use this power distribution block on a 1000V DC solar or battery system?
Yes. The MPDB69143 is rated 1000V on both AC and DC per UL, and the AC rating covers 50/60 Hz. That makes it usable for DC combiner and battery feeds as well as three-phase AC distribution.
8) Are the lugs on the Mersen MPDB69143 rated for both copper and aluminum conductors?
The connectors are tin-plated aluminum, which is the dual-rated construction used for AL/CU terminations, and the block carries separate ampacity ratings for copper (620A) and aluminum (500A). The tin plating is what keeps the aluminum body from oxidizing at the contact surface. Body is glass-filled polycarbonate.
9) How big a lug hole is on this block, and will my compression lug or bare conductor fit?
These are box-type set screw terminals, not bolt-on pads. Primary openings are 0.75 in diameter, secondary openings 0.27 in. You land bare stranded conductor directly, so you do not need crimp lugs, but an already-crimped lug will not go in.
10) Is the Mersen MPDB69143 UL listed and RoHS compliant for a spec job?
It is UL 1953 Listed and RoHS compliant, which covers most industrial panel and OEM submittal requirements for an open-style power distribution block.
How fast can I get the Mersen MPDB69143 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 MPDB69143 come with a warranty?
Absolutely. The Mersen MPDB69143 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 MPDB69143?
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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