Milbank 4 Terminal Ringless Me...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,029.53
Milbank U4433-X 4 Terminal Ringless Large Closing Plate Lever Bypass Side Wireway 250kcmil Maximum

Milbank 4 Terminal Ringless Meter Socket with Lever Bypass 320A 1 Phase 600V

(No reviews yet) Write a Review

Model: U4433-X

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

$1,029.53
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 4 Terminal Ringless Meter Socket with Lever Bypass 320A 1 Phase 600V

Professional meter socket with lever bypass for reliable electrical service connections

The Milbank 4 Terminal Ringless Meter Socket delivers professional-grade electrical metering with integrated lever bypass functionality. Engineered for 320 continuous ampere service at 600 volts alternating current, this 1 phase meter socket features G90 galvanized steel construction with powder coat finish for long-lasting durability. The ringless design with large closing plate and surface mount configuration provides versatile installation options for overhead or underground cable entry applications.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads with reliable performance for demanding applications
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without service interruption
  • 4 Terminal Ringless Design: Simplifies installation and provides secure electrical connections without ring terminals
  • G90 Galvanized Steel Construction: Delivers superior corrosion resistance and structural integrity in outdoor environments
  • Type 3R Enclosure Rating: Provides protection against rain, sleet, and ice formation for reliable outdoor operation
  • UL Listed Certification: Ensures compliance with safety standards and code requirements
  • Overhead/Underground Cable Entry: Accommodates flexible installation configurations for various service entrance requirements

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: 31.5 IN
  • Product Length: 4.844 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 4.844L x 15W x31.5H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 15 IN

Professional Applications

  • Residential Service Entrance Metering
  • Commercial Building Electrical Service
  • Multi-Unit Property Metering
  • Industrial Facility Power Distribution
  • Utility Service Connections
  • Electrical Contractor Installations
  • Municipal and Government Buildings

Why Choose Milbank Quality?

Milbank meter sockets deliver proven reliability with UL Listed certification and Type 3R weather protection. The G90 galvanized steel construction with powder coat finish ensures long-term durability in demanding outdoor environments, while the glass polyester insulation and 2 barrel ground lug provide enhanced safety and performance for professional 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:
31.5 IN
Product Length:
4.844 IN
Product Size:
4.844L x 15W x31.5H
Product Type:
Ringless 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:
15 IN
Department:
Electrical
Product Subgroup:
Electrical
Product Group:
Metering & Service Entrance

Milbank U4433-X – Frequently Asked Questions

1) Will the Milbank U4433-X meter socket work for a 320 amp / 400 amp residential service upgrade?
The Milbank U4433-X is rated 320 continuous amperes, single phase, 600 VAC, 60 Hz, which is the standard socket for what utilities call a 400 amp class residential service (320A continuous is the rating stamped on that class of socket). It has one meter position and four jaws, so it suits a single-phase 120/240V service. It has no main breaker, so overcurrent protection has to come from downstream panels or a separate disconnect.
2) Does the U4433-X socket include a main breaker or disconnect?
No. The U4433-X is a meter socket only, with no main breaker and no receptacles. It is not a meter-main combination. If the job calls for service disconnect at the meter, you need a separate main breaker enclosure downstream or a meter-main combination unit instead.
3) What size conductors will the U4433-X lugs accept?
The U4433-X uses single mechanical terminals with a 250 kcmil maximum conductor size, fed through a side wireway. Equipment grounding is a 2-barrel ground lug. If your service entrance conductors are larger than 250 kcmil, this socket is not the right unit.
4) What does the lever bypass on this meter socket actually do for me on the job?
The lever bypass lets a meter be pulled and replaced without dropping load to the building. You throw the lever to shunt current around the meter jaws, then remove the meter. For occupied multi-family or commercial buildings where an outage means complaints, that is the reason to specify a bypass socket over a plain one. Many utilities require lever bypass at 320A class service, so confirm what the serving utility has approved.
5) Can I use the U4433-X on a three-phase or 208Y/120 service?
No. It is a single-phase, 4-terminal socket with one meter position. A three-phase service needs a 7-jaw socket. The 600 VAC rating is the insulation rating of the enclosure, not an indication that it will meter a three-phase system.
6) Can this Milbank socket be used for both overhead and underground service entrance?
Yes. Cable entry is rated for overhead or underground, and it ships with a large closing plate covering the hub opening. For an overhead drop you remove the closing plate and install the correct hub size for your raceway; for an underground lateral you leave the plate in place and enter from below.
7) Is the U4433-X rated for outdoor mounting on an exterior wall?
Yes. The enclosure is UL Listed and Type 3R, which covers rain, sleet and ice on an outdoor wall. The shell is G90 galvanized steel with a powder coat finish, and the internal insulation is glass polyester. Type 3R is not washdown or dust-tight, so it is not the right choice inside a corrosive or high-pressure-hose environment.
8) Ringless versus ring-type meter socket, which one do I need?
The U4433-X is a ringless socket: the cover itself slides over the meter and is sealed by the utility, rather than the meter being held by a separate sealing ring. Which style you can install is set by the serving utility, not by preference, so check their service handbook first. If they specify ring-type, a ringless socket will be rejected at inspection even though the electrical ratings match.
9) What is the exact part number and UNSPSC code for the Milbank 320A lever bypass ringless socket?
The manufacturer part number is Milbank U4433-X, within the 4T32 product family. The UNSPSC classification code is 39121102. Distributors cross-referencing 320A single-phase 4-terminal ringless sockets with lever bypass and a large closing plate should match on the U4433-X designation.
How fast can I get the Milbank U4433-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 U4433-X come with a warranty?
Absolutely. The Milbank U4433-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 U4433-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 U4433-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.
!