Milbank 320 Amp 3-Phase Ringle...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,052.91
Milbank 7 Terminal Ringless Meter Socket Plain Top Lever Bypass Side Bussed, 1 Position 320 Ampere

Milbank 320 Amp 3-Phase Ringless Meter Socket with Lever Bypass Underground Entry

(No reviews yet) Write a Review

Model: U2120-O-HSP

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

$1,052.91
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 320 Amp 3-Phase Ringless Meter Socket with Lever Bypass Underground Entry

Professional electrical metering solution with lever bypass functionality

The Milbank 320 Amp 3-Phase Ringless Meter Socket delivers reliable electrical metering for commercial and industrial applications. Featuring robust G90 galvanized steel construction with powder coat finish and Type 3R enclosure rating, this surface-mount unit provides 320 continuous ampere capacity with convenient lever bypass provision for maintenance operations. The 7-terminal design with 3/8 inch stud terminals and glass polyester insulation ensures secure connections and long-term performance in demanding environments.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads for commercial and industrial metering applications with reliable performance.
  • 3-Phase Configuration: Supports three-phase electrical systems commonly used in commercial facilities and industrial operations.
  • Lever Bypass Provision: Enables safe maintenance and meter replacement without interrupting power to critical loads.
  • Type 3R Enclosure Rating: Provides weather-resistant protection for outdoor installations and harsh environmental conditions.
  • G90 Galvanized Steel Construction: Delivers superior corrosion resistance and structural integrity with powder coat finish for extended service life.
  • Underground Cable Entry: Accommodates underground electrical service connections for clean, professional installations.
  • UL Listed Certification: Meets rigorous safety and performance standards for commercial electrical applications.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Underground
  • Departent: Electrical
  • Frequency Rating: 60 Hertz
  • Insulation: Glass Polyester
  • Main Breaker Size: No Main Breaker
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 3 Phase
  • Product Family Code: 7T32
  • Product Height: 31.75 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 x31.75H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: 3/8 Inch Stud
  • Unspsc Number: 39121102
  • Width: 17.75 IN

Professional Applications

  • Commercial Building Electrical Service
  • Industrial Facility Power Distribution
  • Multi-Tenant Properties
  • Retail and Office Buildings
  • Manufacturing Facilities
  • Institutional Buildings
  • High-Capacity Residential Services

Why Choose Milbank Quality?

Milbank delivers proven reliability with UL Listed certification and Type 3R weather-resistant construction. The robust G90 galvanized steel enclosure with powder coat finish ensures long-term durability in demanding commercial and industrial environments, while the professional 7-terminal design with glass polyester insulation provides secure, maintenance-friendly electrical connections.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Underground
Frequency Rating:
60 Hertz
Insulation:
Glass Polyester
Main Breaker Size:
No Main Breaker
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
3 Phase
Product Family Code:
7T32
Product Height:
31.75 IN
Product Length:
6.5 IN
Product Size:
6.5L x 17.75W x31.75H
Product Type:
Ringless Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
3/8 Inch Stud
Unspsc Number:
39121102
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
17.75 IN
Department:
Electrical
Product Subgroup:
Electrical
Insulation Type:
Glass Polyester
Installation Category:
Surface Mount
Terminal Type:
3/8 Inch Stud
Number of Phases:
3
Product Details:
Ringless Meter Socket
Frequency:
60 hertz

Milbank U2120-O-HSP – Frequently Asked Questions

1) Will the Milbank U2120-O meter socket work on a 3-phase 4-wire service?
The U2120-O is a 7-terminal, 3-phase ringless socket, which is the terminal count used for 3-phase 4-wire metering. It is a single meter position rated 320 continuous amps at 60 Hz. If your service is single-phase, this is the wrong socket - you want a 4-terminal or 5-terminal single-phase unit instead.
2) Does this Milbank 320 amp socket include a main breaker or disconnect?
No breaker in it. The U2120-O is a meter socket only, with no main breaker and no receptacles, so the service disconnect has to be provided downstream in a separate panel or disconnect enclosure. What it does have is a lever bypass, so the meter can be pulled or swapped without dropping load.
3) Can the Milbank U2120-O be used with overhead service entrance?
It is built for underground cable entry, with a plain top (no hub opening for a service mast). For an overhead drop you need a socket with a hub or hub opening top rather than this plain-top underground version.
4) What is the difference between the U2120-O and the U2120-O-HSP?
Same 320 amp 7-terminal ringless socket either way. The HSP version adds a stainless steel hasp so the cover can be padlocked, which is what a lot of utilities and commercial owners require for tamper control. If your utility does not call for a locking hasp, the standard U2120-O covers it.
5) What size conductors will the terminals on this Milbank meter socket take?
The U2120-O uses 3/8 inch stud terminals rather than a fixed mechanical lug, so the conductor lands on a stud with the appropriate lug or terminal adapter for your cable size. Plan on supplying lugs sized to the conductors your 320 amp service calls for.
6) How much wall space do I need for this 320 amp Milbank socket, and how does it mount?
Surface mount, and the enclosure measures 6.5L x 17.75W x 31.75H inches. Allow for the full 31.75 inch height plus working clearance in front, and 6.5 inches of projection off the wall.
7) Is this Milbank meter socket rated for outdoor mounting?
Yes, it carries a Type 3R enclosure rating and is UL Listed, so it is suitable for outdoor wall mounting exposed to weather. The shell is G90 galvanized steel with a powder coat finish for corrosion resistance.
8) What does ringless mean on a meter socket, and will my utility accept it?
Ringless means the cover secures without a sealing ring around the meter; the cover itself is sealed to the utility's requirement. Utilities specify either ringless or ring type by territory, so confirm which your serving utility accepts before ordering. The U2120-O is the ringless configuration with lever bypass, family code 7T32.
9) Why choose a lever bypass socket instead of a non-bypass meter socket?
Lever bypass lets the meter be removed for testing or replacement while the load stays energized, which matters on tenant spaces, retail, or manufacturing where you cannot drop power for a meter swap. A non-bypass socket is cheaper to install but every meter change is an outage. On the U2120-O the bypass is built in, side bussed.
10) Is this Milbank socket suitable for a 400 amp class service?
It is rated 320 continuous amperes, which is the standard continuous rating for what the trade calls a 400 amp class (320A continuous) service. It will not serve a true 400 amp continuous load. For anything above 320 continuous you need a higher rated socket or a CT metering cabinet.
11) What insulation is used behind the jaws on this Milbank socket?
Glass polyester, which is the molded insulating base the terminal studs and jaws mount to. It holds up better than a phenolic base in the heat and moisture a Type 3R outdoor enclosure sees.
12) What UNSPSC code should I use to procure this meter socket?
The Milbank U2120-O ringless meter socket is classified under UNSPSC 39121102, which is what most institutional and government purchasing systems will want on the requisition line.
How fast can I get the Milbank U2120-O-HSP 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 U2120-O-HSP come with a warranty?
Absolutely. The Milbank U2120-O-HSP 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 U2120-O-HSP?
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 U2120-O-HSP 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.
!