Milbank 4 Terminal Ring Type M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4,902.93
Milbank U3251-O-200-CB 4 Terminal Ring Type Plain Top 1-200 Ampere Main Breaker Bypass Studs

Milbank 4 Terminal Ring Type Meter Socket with Dual 200A Main Breakers and Link Bypass

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Model: U3251-O-200-CB

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

$4,902.93
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Milbank 4 Terminal Ring Type Meter Socket with Dual 200A Main Breakers and Link Bypass

Professional electrical metering solution with integrated main breaker protection

The Milbank 4 Terminal Ring Type Meter Socket delivers reliable single-phase electrical metering with dual 200 ampere main breaker protection and 320 continuous ampere rating. Constructed with G90 galvanized steel and powder coat finish in a Type 3R enclosure, this surface-mount unit features underground cable entry with side wireway and link bypass provision for professional electrical installations.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Provides robust capacity for demanding electrical loads with reliable performance under continuous operation.
  • Dual 200A Main Breakers: Offers redundant overcurrent protection and flexible load distribution for enhanced system reliability.
  • Type 3R Enclosure: Weather-resistant construction protects internal components from rain, sleet, and ice formation for outdoor installations.
  • G90 Galvanized Steel Construction: Corrosion-resistant material with powder coat finish ensures long-term durability in harsh environments.
  • Link Bypass Provision: Enables temporary power continuity during maintenance without service interruption.
  • Underground Cable Entry: Side wireway design accommodates underground service connections with proper cable management.
  • UL Listed Certification: Meets rigorous safety standards for professional electrical installations and code compliance.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket With Main
  • Brand Name: Milbank
  • Bypass Provision: Link Bypass
  • Cable Entry: Underground with Side Wireway
  • Departent: Electrical
  • Equipment Ground: 2 Barrel Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Plain Top
  • Insulation: Glass Polyester
  • Load Side Wire Range: 1 AWG - 300 kcmil
  • Main Breaker Size: Two 200 Ampere Main Breakers
  • Number Of Jaws: 4 Terminal
  • Number Of Main Breakers: 2
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Family Code: 4T32
  • Product Height: 39.938 IN
  • Product Length: 6 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6L x 23.813W x39.938H
  • Product Type: Ring Type Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: 1/2 Inch Stud Line Side
  • Unspsc Number: 39121102
  • Voltage Rating: Up to 240 Volts Alternating Current
  • Width: 23.813 IN

Professional Applications

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

Why Choose Milbank Quality?

Milbank delivers proven reliability with UL Listed certification and Type 3R weather-resistant construction. The G90 galvanized steel with powder coat finish ensures long-term performance in demanding outdoor environments, while the comprehensive technical specifications support professional electrical installations with confidence.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket With Main
Brand Name:
Milbank
Bypass Provision:
Link Bypass
Cable Entry:
Underground with Side Wireway
Equipment Ground:
2 Barrel Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Plain Top
Insulation:
Glass Polyester
Load Side Wire Range:
1 AWG - 300 kcmil
Main Breaker Size:
Two 200 Ampere Main Breakers
Number Of Jaws:
4 Terminal
Number Of Main Breakers:
2
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Family Code:
4T32
Product Height:
39.938 IN
Product Length:
6 IN
Product Size:
6L x 23.813W x39.938H
Product Type:
Ring Type Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
1/2 Inch Stud Line Side
Unspsc Number:
39121102
Voltage Rating:
Up to 240 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
23.813 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Product Group:
Power Distribution

Milbank U3251-O-200-CB – Frequently Asked Questions

1) Can I use a Milbank U3251-O-200-CB meter socket for a 320 amp residential service?
That's exactly what the U3251-O-200-CB is built for. It's rated 320 continuous amperes on a single-phase, 60 Hz service up to 240 volts, with two 200 ampere main breakers inside a single meter position. The pair of 200A breakers is how a 320 class service gets split into two distribution paths, so you can feed a main panel and a subpanel (or a house panel plus a shop/ADU feed) straight out of the socket without a separate disconnect enclosure.
2) Is the Milbank U3251-O-200-CB a ringless or ring type meter socket?
Ring type. The utility seals it with a sealing ring around the meter rim rather than a ringless cover, and that is not interchangeable, the serving utility specifies one or the other for the territory. Call the utility before ordering if you are not sure which they accept. It's a 4 terminal (4 jaw) socket, which is the standard single-phase 120/240 volt configuration.
3) What size conductors will land in the Milbank 320 amp meter socket with dual 200A breakers?
Load side lugs on the U3251-O-200-CB take 1 AWG through 300 kcmil, so each 200 amp breaker will accept the usual 4/0 aluminum or 2/0 copper feeder for a 200 amp run, and you have headroom up to 300 kcmil if you are upsizing for voltage drop on a long pull. The line side lands on 1/2 inch studs rather than lugs, so the service conductors need terminations sized for a 1/2 inch bolt. Equipment grounding is a 2 barrel ground lug.
4) Can the Milbank U3251-O-200-CB be mounted outdoors in rain and snow?
Yes. It's a Type 3R enclosure, which is the rain, sleet and ice-resistant rating used for outdoor service equipment, built from G90 galvanized steel with a powder coat finish for corrosion resistance. It's also UL Listed. Internal insulation is glass polyester.
5) What does link bypass mean on a Milbank meter socket, and do I need it?
Link bypass lets the utility keep power flowing to the load while the meter is pulled, by closing a bypass link across the meter jaws instead of dropping the service. On the U3251-O-200-CB that's the bypass provision, visible as the bypass studs at the jaws. Many utilities require bypass on 320 class services so meter changes and testing don't take a building dark, and property managers on occupied buildings usually want it for the same reason. Check your utility's meter equipment list, because some territories will only accept a bypass socket and others only a non-bypass one.
6) Do I still need a separate main disconnect after a Milbank 320A meter socket with breakers?
Not for the breakers themselves. The U3251-O-200-CB is a meter socket with main, and the two 200 ampere breakers act as the service disconnecting means, so each feeder leaving the socket is already protected and can run to a main lug panel instead of a main breaker panel. A plain meter socket without a main would require a separate disconnect or a main breaker panel downstream. There are no receptacles built into this unit, so if the job calls for a service outlet at the meter it has to be provided separately.
7) Can I meter two apartments or two tenants with the Milbank U3251-O-200-CB?
No. It has a single meter position, so it measures one account even though it feeds two 200 amp breakers. It suits one service split into two feeders, a house panel plus an addition, a shop, or an EV/heat pump load. For separately billed tenants you need a multi-position meter stack or ganged sockets, one metered position per tenant.
8) Will a Milbank U3251-O-200-CB work on a 208Y/120 three phase service?
No. It's a single-phase device, 4 terminal, rated up to 240 volts AC at 60 Hz. Four jaws is the single-phase 120/240 arrangement; a three-phase service needs a 7 jaw socket. Using it on three phase is not an option, order a 7 terminal socket instead.
9) What is the exact Milbank part number for the 320 amp ring type socket with two 200 amp breakers?
Milbank U3251-O-200-CB, in the 4T32 product family. The designation covers the 4 terminal ring type plain top 320 amp socket with 200 ampere main breaker and bypass studs. Its UNSPSC classification is 39121102.
How fast can I get the Milbank U3251-O-200-CB 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 U3251-O-200-CB come with a warranty?
Absolutely. The Milbank U3251-O-200-CB 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 U3251-O-200-CB?
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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