Milbank 320A Ring-Type Meter S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$9,116.39
Milbank 4 Terminal Ring-Type Plain Top 120/240V 320 Amperes Main Breaker 30-Branch Circuit

Milbank 320A Ring-Type Meter Socket with Main Breaker and 30-Circuit Load Center 120/240V Single Phase

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Model: M404-UG-LC

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

$9,116.39
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Milbank 320A Ring-Type Meter Socket with Main Breaker and 30-Circuit Load Center 120/240V Single Phase

Professional Meter Socket with Integrated Main Breaker and Load Center

The Milbank 320A Ring-Type Meter Socket combines metering, main breaker protection, and load center distribution in a single professional unit. Featuring 4-terminal ring-type construction with 320 continuous ampere rating and 120/240V single phase operation, this UL Listed Type 3R unit delivers reliable service entrance protection with integrated 30-branch circuit capacity. Built with G90 galvanized steel and powder coat finish for durability in surface mount applications.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Provides robust capacity for residential and light commercial electrical service entrance applications.
  • 4-Terminal Ring-Type Design: Ensures secure utility connections with proven ring-type jaw configuration for reliable power transfer.
  • Integrated Main Breaker: Features one 400 ampere main breaker providing overcurrent protection and service disconnect capability.
  • 30-Branch Circuit Capacity: Accommodates comprehensive load distribution with 30 branch circuit positions for complete electrical panel functionality.
  • Type 3R Enclosure Rating: Weather-resistant construction suitable for outdoor installations with protection against rain and ice formation.
  • G90 Galvanized Steel Construction: Durable material with powder coat finish provides long-term corrosion resistance and professional appearance.
  • UL Listed Certification: Meets rigorous safety standards ensuring code compliance and reliable performance in electrical service applications.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket With Main And Load Center
  • Brand Name: Milbank
  • Cable Entry: Underground
  • Departent: Electrical
  • Equipment Ground: Ground Bar
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Plain Top
  • Insulation: Glass Polyester
  • Line Side Wire Range: 6 AWG - 350 kcmil
  • Main Breaker Size: One 400 Ampere Main Breaker
  • Number Branch Circuits: 30
  • Number Of Jaws: 4 Terminal
  • Number Of Main Breakers: 1
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Family Code: HPWR
  • Product Height: 47 IN
  • Product Length: 6 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6L x 34.88W x47H
  • Product Type: Ring Type Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: Up to 240 Volts Alternating Current
  • Width: 34.88 IN

Professional Applications

  • Residential Service Entrance
  • Small Commercial Buildings
  • Multi-Unit Properties
  • Professional Offices
  • Retail Establishments
  • Light Industrial Facilities

Why Choose Milbank Quality?

Milbank delivers proven reliability with UL Listed certification and Type 3R weather-resistant construction. The G90 galvanized steel with powder coat finish ensures long-term durability, while the comprehensive 30-branch circuit capacity and integrated main breaker provide complete electrical service entrance solutions for professional installations.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket With Main And Load Center
Brand Name:
Milbank
Cable Entry:
Underground
Equipment Ground:
Ground Bar
Frequency Rating:
60 Hertz
Hub Closing Plate:
Plain Top
Insulation:
Glass Polyester
Line Side Wire Range:
6 AWG - 350 kcmil
Main Breaker Size:
One 400 Ampere Main Breaker
Number Branch Circuits:
30
Number Of Jaws:
4 Terminal
Number Of Main Breakers:
1
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Family Code:
HPWR
Product Height:
47 IN
Product Length:
6 IN
Product Size:
6L x 34.88W x47H
Product Type:
Ring Type Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
Single Mechanical
Unspsc Number:
39121102
Voltage Rating:
Up to 240 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
34.88 IN
Department:
Electrical
Product Subgroup:
Electrical
Insulation Type:
Glass Polyester
Hub Style:
Plain Top
Installation Category:
Surface Mount
Terminal Type:
Single Mechanical
Number of Phases:
1
Product Details:
Ring Type Meter Socket
Frequency:
60 hertz
Number of Terminations:
4

Milbank M404-UG-LC – Frequently Asked Questions

1) Will a Milbank M404-UG-LC meter socket work for a 320 amp underground service?
Underground is the only cable entry this unit is built for. The M404-UG-LC is rated 320 continuous amperes at up to 240 volts AC, single phase, 60 Hertz, with a plain top (no hub opening), so the service laterals come up from below rather than through a weatherhead overhead. If you are feeding from an overhead drop, you need a hub-top socket instead, not this one.
2) How much wall space do I need for a Milbank 320A meter socket with load center?
Plan on roughly 34.88 inches wide by 47 inches high, projecting 6 inches off the wall. It is a surface mount enclosure, so those are the outside dimensions of the box on the wall face, and you still need working clearance in front per your local code. On a narrow pilaster or between two windows, measure the 34.88 inch width first, because that is the dimension that usually kills the location.
3) Can this Milbank meter socket combo be mounted outdoors?
Yes, it is a Type 3R enclosure and UL Listed, so it is rated for outdoor use with protection against rain and ice formation. The body is G90 galvanized steel with a powder coat finish for corrosion resistance. Type 3R does not mean washdown or dust tight, so it is not the right box for a hosed-down or heavy dust environment.
4) What is the difference between the M404-UG-LC and the M404-UG-LC-BS?
Bypass. The M404-UG-LC has no bypass, and the M404-UG-LC-BS is the link bypass version, which lets the utility maintain power through the socket while the meter is pulled. Which one you order is dictated by your serving utility's meter equipment requirements, not by preference. Everything else is the same: 320 continuous amperes, 120/240V single phase, one 400 ampere main breaker, 30 branch circuit positions.
5) Is this a ringless or ring-type meter socket, and will my utility accept it?
Ring type, with a 4 terminal jaw configuration and a single meter position. Utilities specify one or the other and they are not interchangeable, so check your utility's approved meter equipment list for ring type before ordering. If their spec calls for a ringless cover, this socket will be rejected at inspection regardless of its amperage rating.
6) Do I still need a separate panel if I install this Milbank 320A meter main?
Not for a modest load. This is an all in one: meter socket, 400 ampere main breaker disconnect, and a 30 branch circuit load center in one enclosure, with a ground bar for equipment grounds. For a house or small commercial space that fits inside 30 spaces, you are done at the service. If you need more circuits, or circuits inside the building rather than out at the meter, run a feeder from the main to an indoor subpanel, which is also how most people handle finished interiors where you do not want branch wiring going back outside.
7) Can I use a Milbank M404-UG-LC on a three phase or 208V service?
No. It is a single phase unit rated up to 240 volts AC at 60 Hertz with 4 terminal jaws, which is the 120/240V single phase three wire configuration. A 120/208V three phase service needs a 7 jaw socket and a three phase panel, so this is the wrong assembly for that building entirely.
8) Does this Milbank meter main have a hub for conduit at the top?
It comes plain top, meaning the top is closed with no hub opening, which is what you want on an underground service where the raceway enters from below. If your install needs a top entry raceway, this is not the configuration to buy, since cutting a plain top yourself compromises the Type 3R rating.
9) Is a 320 amp meter main like this enough for a multi-unit property, or do I need a meter stack?
This Milbank unit has one meter position, so it meters a single account. For a duplex, fourplex, or any building where each tenant is billed separately, you need a multi-position meter stack or a bank of individual sockets, not this. Where one owner is metered for the whole building, small commercial, a professional office, a single large residence, the 320 continuous ampere rating with 30 branch circuits handles it in one enclosure.
10) Does this Milbank meter socket include a GFCI receptacle for the service equipment?
No receptacles are built into the M404-UG-LC. If your jurisdiction or the job spec requires a convenience outlet at the outdoor service equipment, plan a separate weatherproof GFCI receptacle and box fed from one of the 30 branch circuit positions.
11) What insulation and construction does the Milbank 320A meter socket use inside?
The jaw assembly is insulated with glass polyester, and the enclosure is G90 galvanized steel with a powder coat finish. Glass polyester holds up to the heat and mechanical stress at the jaws better than plain thermoplastic, which is the failure point people see on older sockets that have been arcing.
How fast can I get the Milbank M404-UG-LC 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 Milbank M404-UG-LC come with a warranty?
Absolutely. The Milbank M404-UG-LC 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 Milbank M404-UG-LC?
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
Why buy the Milbank M404-UG-LC from ZenSupply?
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