Milbank 320A Ring Type Meter S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$821.94
Milbank U3548-X 4 Terminal Ring Type Large Closing Plate Link Bypass

Milbank 320A Ring Type Meter Socket with 4 Terminal Link Bypass and Large Closing Plate

(No reviews yet) Write a Review

Model: U3548-X

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

$821.94
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Milbank 320A Ring Type Meter Socket with 4 Terminal Link Bypass and Large Closing Plate

Professional single-phase metering solution with link bypass capability

The Milbank 320A Ring Type Meter Socket delivers reliable single-phase electrical metering with 320 continuous ampere capacity and professional link bypass functionality. Constructed with G90 galvanized steel and powder coat finish in a Type 3R rated enclosure, this surface-mount meter socket accommodates overhead or underground cable entry with glass polyester insulation and bonded neutral equipment ground for dependable service.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles substantial electrical loads for residential and light commercial applications with reliable capacity.
  • 4 Terminal Ring Type Design: Provides secure mechanical connections with single mechanical terminals for consistent electrical contact.
  • Link Bypass Provision: Enables temporary power continuity during meter maintenance or replacement without service interruption.
  • Type 3R Enclosure Rating: Weather-resistant construction protects against rain, sleet, and ice formation for outdoor installations.
  • G90 Galvanized Steel Construction: Durable material with powder coat finish resists corrosion and provides long-term structural integrity.
  • Flexible Cable Entry: Accommodates both overhead and underground service connections for versatile installation options.
  • UL Listed Certification: Meets rigorous safety standards for professional electrical installations and code compliance.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: Link Bypass
  • Cable Entry: Overhead or Underground
  • Departent: Electrical
  • Equipment Ground: Bonded Neutral
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Closing Plate
  • Insulation: Glass Polyester
  • Line Side Wire Range: 4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
  • Load Side Wire Range: 4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
  • Main Breaker Size: No Main Breaker
  • Number Of Jaws: 4 Terminal
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Family Code: 4T32
  • Product Height: 33 IN
  • Product Length: 6 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6L x 14W x33H
  • Product Type: Ring Type Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 14 IN

Professional Applications

  • Residential Service Metering
  • Light Commercial Buildings
  • Multi-Unit Properties
  • Professional Offices
  • Retail Establishments
  • Service Upgrade Projects
  • New Construction Installations

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 professional ring type design with glass polyester insulation and bonded neutral grounding provides dependable electrical metering performance for demanding applications.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Link Bypass
Cable Entry:
Overhead or Underground
Equipment Ground:
Bonded Neutral
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Closing Plate
Insulation:
Glass Polyester
Line Side Wire Range:
4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
Load Side Wire Range:
4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
Main Breaker Size:
No Main Breaker
Number Of Jaws:
4 Terminal
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Family Code:
4T32
Product Height:
33 IN
Product Length:
6 IN
Product Size:
6L x 14W x33H
Product Type:
Ring Type Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
Single Mechanical
Unspsc Number:
39121102
Voltage Rating:
600 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
14 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Product Group:
Power Distribution

Milbank U3548-X – Frequently Asked Questions

1) Will a Milbank U3548-X meter socket work for a 320 amp / 400 amp class residential service upgrade?
The U3548-X is rated 320 continuous amperes, single phase, 600 VAC, 60 Hz, with one meter position. That is the standard rating utilities call a 400 amp class residential service, since 320 continuous is the sustained rating behind a 400 amp class meter. It has no main breaker built in, so the overcurrent protection has to live downstream in the panel or in a separate disconnect.
2) Can the Milbank U3548-X be fed overhead, or is it underground only?
Either. Cable entry is rated for overhead or underground service, so the same socket works for a weatherhead drop or a lateral from a pad transformer. It ships with a large closing plate covering the hub opening, which is what you remove and replace with the appropriate hub when the utility requires an overhead conduit entry at the top.
3) Is the Milbank U3548-X a 4 jaw or 5 jaw socket, and how do I know which my utility wants?
It is a 4 terminal (4 jaw) ring type socket for single phase service. Four jaws is the standard single phase 120/240 volt three wire configuration. A 5 jaw socket is what utilities call for on network or three wire single phase from a three phase system, where the fifth jaw carries a neutral or third phase sense. Utilities publish which they accept, and the two are not interchangeable, so confirm 4 jaw on the service application before ordering.
4) What is a ring type meter socket and will it accept my utility's meter seal ring?
Ring type means the meter is retained by a sealing ring that clamps around the meter rim, which the utility then seals. The U3548-X is a ring type socket, so it needs a ring-and-seal meter installation. Ringless sockets use a removable cover held by a sealed latch instead and take a different meter mounting. Utilities standardize on one or the other by territory, so match the socket to what the utility specifies for the address.
5) How much wall space do I need for the Milbank U3548-X, and can it mount on siding or block?
The enclosure measures 6 x 14 x 33 inches (6L x 14W x 33H) and is surface mount, so it needs a flat 14 inch wide by 33 inch tall footprint with about 6 inches of projection off the wall. On siding or stucco it wants backing behind the fasteners; on block or concrete it fastens directly. Add the usual working clearance in front and set the meter height to whatever the serving utility requires.
6) Can the U3548-X meter socket be installed outdoors in rain and snow?
Yes. The enclosure is Type 3R rated and UL Listed, which covers outdoor exposure to rain, sleet and ice. The body is G90 galvanized steel with a powder coat finish, which is the corrosion package on Milbank's outdoor sockets. Type 3R is rainproof, not watertight or dust-tight, so it is not the choice for a washdown area or a hose-directed location.
7) Does the Milbank U3548-X have a bonded neutral, and does that change how I ground the service?
The equipment ground is bonded neutral, meaning the neutral is bonded to the enclosure at the socket. On a service entrance socket that is the intended arrangement, since the service point is where the grounded conductor bonds to the grounding electrode system and the enclosure. Downstream of it, in a subpanel or separate structure, the neutral and ground stay separated. If the application is not the service entrance, a bonded neutral socket is the wrong part.
8) Can I standardize a whole property on the Milbank U3548-X, or do I need one per tenant?
Each U3548-X carries a single meter position, so a multi-tenant building needs one socket per metered unit, plus whatever gutter and service equipment the layout requires. For a building with several units on one service, a multi-position meter stack or a gang socket is the usual choice, since it groups the meters in one enclosure and one set of service conductors. The U3548-X is the right part for individual 320 amp services: a single house, a standalone unit, or a service upgrade at one address.
9) What insulation is used behind the meter jaws on the Milbank U3548-X?
The jaw block insulation is glass polyester, a thermoset material that holds its dielectric strength and dimensional stability under the heat a 320 amp service puts through the jaws. That matters on bypass sockets in particular, where the internal links and jaws carry sustained current in a tight enclosure.
How fast can I get the Milbank U3548-X 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 U3548-X come with a warranty?
Absolutely. The Milbank U3548-X 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 U3548-X?
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 U3548-X from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!