Milbank 320A 1-Phase Ringless ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$687.13
Milbank U3939-X 4 Terminal Ringless Large Closing Plate Lever Bypass Pal

Milbank 320A 1-Phase Ringless Meter Socket with Lever Bypass and Large Closing Plate

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Model: U3939-X

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

$687.13
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Milbank 320A 1-Phase Ringless Meter Socket with Lever Bypass and Large Closing Plate

Professional meter socket solution with integrated bypass capability

The Milbank 320A 1-Phase Ringless Meter Socket delivers reliable electrical metering with integrated lever bypass functionality for professional installations. Featuring robust G90 galvanized steel construction with powder coat finish and Type 3R enclosure rating, this surface-mount meter socket provides 320 continuous ampere capacity at 600V AC with glass polyester insulation for dependable service in overhead or underground cable applications.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles substantial electrical loads for residential and light commercial applications with reliable capacity management.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without interrupting power service to critical loads.
  • Type 3R Enclosure Rating: Weather-resistant construction protects internal components from rain, sleet, and ice formation for outdoor installations.
  • G90 Galvanized Steel with Powder Coat: Corrosion-resistant materials ensure long-term durability and professional appearance in harsh environments.
  • 4 Terminal Ringless Design: Simplifies installation with 3/8 inch stud terminals and eliminates need for meter rings or additional hardware.
  • UL Listed Certification: Meets rigorous safety standards for code compliance and professional installation confidence.
  • Large Closing Plate: Accommodates various cable entry configurations while maintaining secure weatherproof seal.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Overhead or Underground
  • Departent: Electrical
  • Equipment Ground: 2 Barrel Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Closing Plate
  • Insulation: Glass Polyester
  • 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: 30 IN
  • Product Length: 5.75 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 5.75L x 16W x30H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: 3/8 Inch Stud
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 16 IN

Professional Applications

  • Residential electrical service installations requiring high amperage capacity
  • Light commercial facilities with substantial power demands
  • Multi-unit residential properties and apartment complexes
  • Professional offices and retail establishments
  • Industrial facilities requiring reliable metering with bypass capability
  • Utility company meter installations with maintenance requirements

Why Choose Milbank Quality?

Milbank meter sockets deliver proven reliability with UL Listed certification and Type 3R weather resistance. The robust G90 galvanized steel construction with powder coat finish ensures long-term performance, while the integrated lever bypass system provides professional-grade serviceability for critical electrical installations.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Overhead or Underground
Equipment Ground:
2 Barrel Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Closing Plate
Insulation:
Glass Polyester
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:
30 IN
Product Length:
5.75 IN
Product Size:
5.75L x 16W x30H
Product Type:
Ringless Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
3/8 Inch Stud
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:
16 IN
Department:
Electrical
Product Subgroup:
Electrical

Milbank U3939-X – Frequently Asked Questions

1) Does the Milbank U3939-X 320A meter socket include a main breaker or disconnect?
No. The U3939-X is a meter socket only, with no main breaker and no factory receptacle. You need a separate main disconnect or panel downstream to complete the service. What it does have is a lever bypass, so the meter can be pulled and swapped without dropping power to the load side.
2) Is the Milbank U3939-X a 4-jaw single phase socket, and will it work on a 200A/320A residential service?
It is a 4 terminal, single phase, single meter position socket rated 320 continuous amps at 600V AC, 60 Hz. That 4-jaw configuration is the standard single phase 3-wire residential/light commercial arrangement. A 320A continuous socket is what utilities typically call a 400A class service; it is not the right socket for a three phase or network meter.
3) Can this Milbank ringless socket be used for an underground lateral, or is it overhead only?
Both. Cable entry is rated for overhead or underground, and it ships with a large closing plate over the hub opening. For an overhead service drop you remove that plate and install the utility-approved hub or conduit fitting; for an underground feed you bring conduit in the bottom and leave the closing plate in place.
4) What size lugs and conductors land in the Milbank U3939-X, and how is the ground handled?
Line and load connections are 3/8 inch stud terminals, so you land conductors with compression or mechanical lugs sized to the stud rather than screwing wire directly into a set-screw connector. Equipment grounding is through 2 barrel ground lugs in the enclosure.
5) What size opening do I need to frame or clear for the Milbank U3939-X on the wall?
Plan for a surface-mounted box measuring 5.75 x 16 x 30 inches, with the 30 inch figure the height and 16 inches the width. Allow working clearance in front and enough room below for the conduit bend if you are coming from underground.
6) Is this meter socket rated for outdoor mounting on an exterior wall?
Yes. The enclosure carries a Type 3R rating and the socket is UL Listed, so it is intended for outdoor use against rain, sleet and ice. The shell is G90 galvanized steel with a powder coat finish for corrosion resistance, and internal insulation is glass polyester.
7) What is the difference between a ringless meter socket and a ring-type one, and which does my utility want?
A ringless socket like the Milbank U3939-X uses a hinged cover that slips over the meter and seals, instead of a separate sealing ring clamping the meter to the socket rim. Utilities specify one or the other, and they are not interchangeable in the field, so confirm which style your serving utility accepts before ordering. Milbank's ringless 320A single phase socket falls under family code 4T32.
8) Why choose a lever bypass socket instead of a plain 320A socket?
The lever bypass lets a meter be removed and replaced while the load stays energized, which matters where you cannot take an outage, like occupied apartments or a retail tenant. On a socket without bypass the power has to come down to change the meter. On the U3939-X the bypass is built in to the 320A single position socket.
9) What is the exact Milbank part number for the 320A ringless lever bypass socket with the large closing plate?
Order it as Milbank U3939-X. That number covers the 4 terminal ringless 320A single phase socket with lever bypass and large closing plate. The UNSPSC code for procurement systems is 39121102.
How fast can I get the Milbank U3939-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 U3939-X come with a warranty?
Absolutely. The Milbank U3939-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 U3939-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
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