Milbank 4 Terminal Ringless Me...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$758.58
Milbank U4721-O-BL 4 Terminal Ringless Meter Socket 200A 1 Phase with Lever Bypass and Barrel Lock Provision

Milbank 4 Terminal Ringless Meter Socket 200A 1 Phase with Lever Bypass and Barrel Lock Provision

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Model: U4721-O-BL-ALT

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

$758.58
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Milbank 4 Terminal Ringless Meter Socket 200A 1 Phase with Lever Bypass and Barrel Lock Provision

Professional Underground Service Metering Solution

The Milbank 4 Terminal Ringless Meter Socket delivers reliable 200A continuous amperage service for 1 phase applications with professional-grade G90 galvanized steel construction and powder coat finish. This UL Listed Type 3R meter socket features lever bypass capability and barrel lock provision for enhanced security and operational flexibility in underground cable entry installations.

Professional Features & Benefits

  • 200A Continuous Rating: Handles demanding electrical loads with reliable amperage capacity for residential and light commercial applications.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without service interruption for operational continuity.
  • Barrel Lock Security: 9/16 inch knockout and angle bracket provision enhances security against unauthorized access.
  • Type 3R Enclosure: Weather-resistant construction protects against rain, sleet, and ice formation for outdoor installations.
  • Underground Cable Entry: Designed specifically for underground service applications with appropriate cable management.
  • G90 Galvanized Steel: Corrosion-resistant material with powder coat finish ensures long-term durability and performance.
  • UL Listed Compliance: Meets rigorous safety standards for professional electrical installations.

Technical Specifications

  • Amperage Rating: 200 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: Underground
  • Departent: Electrical
  • Equipment Ground: Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Plain Top
  • Insulation: Glass Polyester
  • Line Side Wire Range: 6 AWG - 350 kcmil
  • Load Side Wire Range: 6 AWG - 350 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: HD4T
  • Product Height: 22 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 x22H
  • Product Type: Ringless Meter Socket
  • Special Features: Alliant Energy
  • Standard: UL Listed;Type 3R
  • Terminal: Lay in
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 16 IN

Professional Applications

  • Residential Underground Service Connections
  • Light Commercial Metering Applications
  • Multi-Unit Property Electrical Service
  • Professional Office Building Installations
  • Retail Establishment Power Metering
  • Municipal and Utility Service Points

Why Choose Milbank Quality?

Milbank meter sockets deliver proven reliability with UL Listed safety compliance and Type 3R weather protection. The G90 galvanized steel construction with powder coat finish ensures long-term performance in demanding outdoor environments, while the 4 terminal ringless design and lay-in terminals provide professional installation flexibility for underground service applications.

Manufacturer Resources

Product Specs

Amperage Rating:
200 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Underground
Equipment Ground:
Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Plain Top
Insulation:
Glass Polyester
Line Side Wire Range:
6 AWG - 350 kcmil
Load Side Wire Range:
6 AWG - 350 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:
HD4T
Product Height:
22 IN
Product Length:
5.75 IN
Product Size:
5.75L x 16W x22H
Product Type:
Ringless Meter Socket
Special Features:
Alliant Energy
Standards:
UL Listed;Type 3R
Terminal:
Lay in
Unspsc Number:
39121102
Voltage Rating:
600 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
200
Product Width:
16 IN
Department:
Electrical
Product Subgroup:
Electrical
Insulation Type:
Glass Polyester
Hub Style:
Plain Top
Installation Category:
Surface Mount
Terminal Type:
Lay In
Number of Phases:
1
Product Details:
Ringless Meter Socket
Frequency:
60 hertz
Number of Terminations:
4
Product Group:
Metering & Service Entrance

Milbank U4721-O-BL-ALT – Frequently Asked Questions

1) Will a Milbank U4721-O-BL meter socket work for a 200A underground residential service?
That is exactly what the U4721-O-BL is built for. It's a 4 terminal ringless socket rated 200 continuous amps, single phase, 600VAC, 60Hz, with underground cable entry and a plain top (no hub opening). One meter position, surface mount. If your service drop comes in overhead, this is the wrong socket, you want an overhead-entry version with a hub or a raintight opening in the top.
2) Does the Milbank U4721-O-BL come with a main breaker, or do I need a separate disconnect?
No breaker in it. The U4721-O-BL is a socket only, zero main breakers and no receptacles, so it meters the service and nothing else. You'll need a separate service disconnect downstream (or a meter-main combination unit instead of this socket) to satisfy the disconnect requirement. Buyers who want the breaker in the same can should be shopping meter-main combos, not a plain ringless socket.
3) What size conductors will land in a Milbank U4721-O-BL 200A meter socket?
Both line and load terminals take 6 AWG through 350 kcmil, and they're lay-in terminals, so you drop the conductor in rather than threading it through a hole. That range covers the usual 200A service conductors, 4/0 aluminum or 2/0 copper, with plenty of headroom for an upsized 250 or 350 kcmil aluminum run on a long underground lateral. There's a ground lug for the equipment ground.
4) What is the difference between the U4721-O-BL and the U4721-O-BL-ALT?
Same socket, different utility approval. The standard version is U4721-O-BL; the U4721-O-BL-ALT is the Alliant Energy version. If you're wiring in Alliant Energy territory, order the ALT so the socket matches what the utility will set a meter in. Everywhere else, take the standard. Both are the same 200A, 4 terminal, ringless, lever bypass configuration.
5) Do I need a ringless or a ring-type meter socket, and which is this?
The U4721-O-BL is ringless, meaning the cover itself clamps the meter in place instead of a separate sealing ring around the meter rim. Utilities specify one or the other and they are not interchangeable, so call the serving utility before you buy. Ringless is the common spec across much of the Midwest and is what the Alliant Energy variant of this socket is built for. If your utility calls for ring type, this socket won't be accepted.
6) Can the meter be pulled on a Milbank U4721-O-BL without killing power to the building?
Yes, it has a lever bypass. The lever shunts line to load so the meter can be pulled and swapped with the load still energized, which is what you want on a tenant-occupied building or anywhere an outage means a service call. Sockets without a bypass require the service to be cut for every meter change. Note that in most territories only utility personnel are permitted to operate the bypass.
7) Will a 4 terminal socket work for my service, or do I need a 5 jaw?
Four terminal is the single phase, three wire arrangement, two line, two load, which is standard 120/240V residential and light commercial service. The U4721-O-BL is 4 terminal, 1 phase. A 5 jaw socket is what you need for network or 120/208V single phase service off a three phase system, where the fifth jaw carries the neutral current for the meter. Confirm the jaw count with the utility before ordering, since they set the meter and won't energize a mismatched socket.
8) Can I run conduit into the top of this Milbank meter socket for an overhead service?
No, the top is a plain top with no hub opening, and the socket is configured for underground cable entry. For an overhead service you need a socket with a hub opening or closing plate in the top to take the service raceway. Using this one for an overhead drop means field-cutting the enclosure, which voids the UL Listing on it.
9) Can this Milbank meter socket be mounted outdoors on an exterior wall?
Outdoor mounting is what it's made for. The enclosure is UL Listed and Type 3R, which is the rain, sleet and ice rating for outdoor service equipment, and the body is G90 galvanized steel with a powder coat finish to hold up against corrosion. Type 3R is not submersible or hosedown rated, so keep it out of flood-prone spots and off wash-down walls.
10) Does the Milbank U4721-O-BL accept a utility barrel lock, and does the lock come with it?
It's prepped for one but not supplied with one. The socket has a 9/16 inch knockout and an angle bracket for a barrel lock provision, which is the standard prep utilities use to seal a socket against unauthorized meter access. Order the barrel lock separately, or, on most services, the utility installs its own once the meter is set.
11) I'm standardizing meter sockets across a multi-unit property. Is one U4721-O-BL enough per building?
One socket, one meter. The U4721-O-BL holds a single meter position, so on a multi-unit property you need one per metered tenant plus whatever the house panel requires. For stacking several meters in one enclosure, a multi-position or modular metering assembly is the right product rather than repeating single sockets across a wall. The single socket makes sense for individually served units, house loads, and standalone buildings.
12) Is a 200A meter socket rated 600 volts safe to use on a 120/240V house service?
Yes. The 600 volt AC rating on the U4721-O-BL is the insulation system's maximum, not a required operating voltage, and the glass polyester insulation carries that rating. A standard 120/240V single phase service sits well under it. The number that actually limits you is the 200 continuous amp rating and the 4 terminal jaw configuration.
13) What UNSPSC code should I use for a Milbank ringless meter socket on a purchase order?
Milbank's 200A ringless meter socket falls under UNSPSC 39121102. That's the code to drop into an institutional or government requisition line when the buying system needs a commodity classification for electrical metering hardware.
How fast can I get the Milbank U4721-O-BL-ALT 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 U4721-O-BL-ALT come with a warranty?
Absolutely. The Milbank U4721-O-BL-ALT 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 U4721-O-BL-ALT?
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 U4721-O-BL-ALT from ZenSupply?
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