Milbank 320A 3-Phase Ringless ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,069.35
Milbank U4911 7 Terminal Ringless Meter Socket - 320A Type 3R Lever Bypass, G90 Galvanized Steel

Milbank 320A 3-Phase Ringless Meter Socket with Lever Bypass - Type 3R G90 Galvanized Steel Enclosure

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Model: U4911-X-QG-BL-AMS

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

$1,069.35
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Milbank 320A 3-Phase Ringless Meter Socket with Lever Bypass - Type 3R G90 Galvanized Steel Enclosure

Professional metering solution with integrated bypass capability

The Milbank 320A 3-Phase Ringless Meter Socket delivers reliable electrical metering with integrated lever bypass functionality for commercial and industrial applications. Featuring robust G90 galvanized steel construction with powder coat finish and Type 3R weatherproof rating, this surface-mount meter socket provides dependable service for overhead or underground cable entry configurations. The 7-terminal design with glass polyester insulation ensures secure connections and long-term performance in demanding electrical environments.

Professional Features & Benefits

  • 320A Continuous Rating: Handles high-capacity electrical loads for commercial and industrial metering applications with reliable amperage capacity.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without service interruption, improving operational flexibility and reducing downtime.
  • Type 3R Weatherproof Enclosure: G90 galvanized steel with powder coat finish provides superior corrosion resistance and protection against outdoor environmental conditions.
  • 3-Phase 600V AC Rating: Supports commercial voltage requirements with 60 Hz frequency rating for versatile electrical system compatibility.
  • Ringless Design: Eliminates the need for meter rings, simplifying installation and reducing potential connection points for enhanced reliability.
  • UL Listed Certification: Meets rigorous safety and performance standards for professional electrical installations and code compliance.
  • Flexible Cable Entry: Accommodates both overhead and underground service connections with appropriate hub provisions for installation versatility.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Barrel Lock Provision: 9/16 Inch Knockout and Angle Bracket for Barrel Lock Provision
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Overhead or Underground
  • Departent: Electrical
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Closing Plate
  • Insulation: Glass Polyester
  • Main Breaker Size: No Main Breaker
  • Number Of Jaws: 7 Terminal
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 3 Phase
  • Product Family Code: 7T32
  • Product Height: 38.75 IN
  • Product Length: 6.5 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6.5L x 17.75W x38.75H
  • Product Type: Ringless Meter Socket
  • Special Features: Ameren Energy
  • Standard: UL Listed;Type 3R
  • Terminal: 3/8 Inch Stud
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 17.75 IN

Professional Applications

  • Commercial Building Electrical Service
  • Industrial Facility Metering
  • Multi-Tenant Properties
  • Manufacturing Plants
  • Retail and Office Buildings
  • Municipal and Government Facilities
  • Educational Institutions

Why Choose Milbank Quality?

Milbank meter sockets deliver proven reliability with UL Listed certification and Type 3R weatherproof protection. The G90 galvanized steel construction with powder coat finish ensures long-term durability and corrosion resistance, while the professional-grade glass polyester insulation and 3/8 inch stud terminals provide secure, dependable electrical connections for demanding commercial and industrial applications.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Overhead or Underground
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Closing Plate
Insulation:
Glass Polyester
Main Breaker Size:
No Main Breaker
Number Of Jaws:
7 Terminal
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
3 Phase
Product Family Code:
7T32
Product Height:
38.75 IN
Product Length:
6.5 IN
Product Size:
6.5L x 17.75W x38.75H
Product Type:
Ringless Meter Socket
Special Features:
Ameren Energy
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:
17.75 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Insulation Type:
Glass Polyester
Hub Style:
Large Closing Plate
Installation Category:
Surface Mount
Terminal Type:
3/8 Inch Stud
Number of Phases:
3
Frequency:
60 hertz
Product Details:
Ringless Meter Socket
Number of Terminations:
7
Product Group:
Power Distribution

Milbank U4911-X-QG-BL-AMS – Frequently Asked Questions

1) Will a Milbank U4911-X 320A meter socket work on a 3-phase 4-wire 120/208V commercial service?
The U4911-X is a 7 terminal, 3 phase socket rated 600V AC at 60 Hz, so it covers 120/208V and 277/480V wye services. The 7 jaw configuration is the standard 3 phase 4 wire self-contained arrangement. If your service is single phase, this is the wrong socket - a single phase service takes a 4 jaw or 5 jaw socket, not a 7 jaw.
2) Does the Milbank U4911-X 320A meter socket include a main breaker or main disconnect?
No breaker and no disconnect. The U4911-X is a meter socket only, one meter position, zero main breakers and no receptacles. You have to feed a separate service disconnect or panel downstream of it. If you want metering and the main device in one enclosure, you need a meter main combination instead, not this socket.
3) What is the difference between the three U4911-X options - Standard, Quadplex Ground, and Quadplex Ground Ameren?
Three orderable versions. U4911-X-BL is the standard 320A lever bypass socket. U4911-X-QG-BL adds the quadplex ground provision. U4911-X-QG-BL-AMS is the quadplex ground version built to the Ameren utility specification. Order by what your serving utility approves: if you are in Ameren territory, the AMS version is the one that gets signed off. All three are the same 7 terminal, 320A, 600V, Type 3R socket underneath.
4) Can a Milbank U4911 meter socket be mounted outdoors on an exterior wall?
Yes. The enclosure is Type 3R and UL Listed, built from G90 galvanized steel with a powder coat finish, which is the standard construction for rain-tight outdoor service equipment. Type 3R protects against rain, sleet and falling dirt for outdoor use; it is not a washdown or submersible rating, so avoid direct hose-down locations.
5) What size conductors and lugs does the Milbank U4911 320A socket land, and can I run it overhead or underground?
Line and load connections are 3/8 inch stud terminals, so you are landing ring or compression lugs on studs rather than pushing conductors into a setscrew barrel - order the lugs to match your conductor size. Cable entry works either overhead or underground, and a large hub closing plate is included for the top entry, so you can fit the hub your utility specifies or leave the plate in place for an underground feed.
6) How much wall space do I need for a Milbank U4911 320A meter socket?
Plan for a footprint of 6.5 x 17.75 x 38.75 inches, with 38.75 inches the height and 17.75 inches the width, projecting 6.5 inches off the wall. It is a surface mount enclosure, so it hangs on the face of the wall or a rack rather than recessing into it. Set the height so the meter face lands within the utility's required window.
7) Why choose a lever bypass meter socket instead of a horn bypass or no bypass?
The lever bypass on the U4911 lets a utility tech or electrician shunt the meter jaws with a lever and pull the meter without dropping power to the building. On a commercial or multi-tenant service that is the difference between a five minute meter swap and a scheduled outage. A no-bypass socket means the load goes dark every time the meter comes out. Many utilities require bypass on 320A class services, so check what your utility mandates before ordering a non-bypass socket.
8) Can a 320A meter socket be sealed and locked for utility security?
The U4911 is a ringless socket, which means the cover itself is the security point - there is no sealing ring to cut. It ships with a 9/16 inch knockout and an angle bracket for a barrel lock provision, so the utility can drop a barrel lock in at the cover. If your utility uses ringed sockets with a sealing ring instead, a ringless cover will not satisfy their inspection.
9) I need to meter several tenants in one building - can I use the Milbank U4911 for that?
Not by itself. The U4911 is a single position socket, one meter, one service. Metering multiple tenants from one point means a multi-position meter stack or a bank of individual sockets, one per tenant. Where the U4911 fits a multi-tenant building is as the single house or master service, or as one socket per tenant where each tenant has a 3 phase 320A service of their own.
10) What insulates the jaws on a Milbank U4911 meter socket, and will it hold up in a hot or humid location?
The jaw block is glass polyester, a thermoset insulator that holds dielectric strength and dimensional stability at the temperatures a 320A socket sees under continuous load, and it does not absorb moisture the way older phenolic can. Paired with the Type 3R G90 galvanized steel enclosure and powder coat finish, that is the combination for outdoor commercial service in humid or coastal-adjacent conditions.
How fast can I get the Milbank U4911-X-QG-BL-AMS 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 U4911-X-QG-BL-AMS come with a warranty?
Absolutely. The Milbank U4911-X-QG-BL-AMS 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 U4911-X-QG-BL-AMS?
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 U4911-X-QG-BL-AMS from ZenSupply?
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