Milbank Ringless Meter Socket ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$6,663.43
Milbank U6227–U6230 4 & 7 Terminal Ringless Meter Socket - Large Closing Plate, 400A Main Breaker with Locking Connector Options

Milbank Ringless Meter Socket with 400A Main Breaker - 320A Continuous, Large Closing Plate, Lever Bypass

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Model: U6227-X-400-K3L-5T9

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

$6,663.43
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Milbank Ringless Meter Socket with 400A Main Breaker - 320A Continuous, Large Closing Plate, Lever Bypass

Professional electrical metering solution with integrated main breaker protection

The Milbank Ringless Meter Socket delivers reliable electrical metering and main breaker protection with 320A continuous amperage rating and 400A main breaker capacity. Constructed with G90 galvanized steel and powder coat finish for durability, this UL Listed Type 3R unit features lever bypass provision and large closing plate for professional installations requiring robust metering solutions.

Professional Features & Benefits

  • 320A Continuous Rating: Provides reliable continuous amperage capacity for demanding electrical applications with professional-grade performance standards.
  • 400A Main Breaker: Integrated main breaker protection ensures safe electrical distribution and overcurrent protection for connected loads.
  • Lever Bypass Provision: Enables safe maintenance and service operations while maintaining electrical continuity when required.
  • G90 Galvanized Steel Construction: Durable galvanized steel with powder coat finish delivers long-lasting protection against environmental conditions.
  • UL Listed Type 3R: Meets rigorous safety standards for outdoor and indoor applications with weather-resistant enclosure rating.
  • Large Closing Plate: Accommodates various hub configurations and provides secure closure for professional installations.
  • Single Position Design: Streamlined single meter position configuration optimizes space utilization and installation efficiency.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket With Main
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Departent: Electrical
  • Equipment Ground: 2 Barrel Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Closing Plate
  • Insulation: Glass Polyester
  • Line Side Wire Range: 4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
  • Load Side Wire Range: Two 3/0 AWG - 500 kcmil
  • Main Breaker Size: One 400 Ampere Main Breaker
  • Number Of Main Breakers: 1
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Product Height: 34 IN
  • Product Length: 6 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6L x 36.25W x34H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Width: 36.25 IN

Professional Applications

  • Commercial Building Electrical Service
  • Industrial Facility Power Distribution
  • Multi-Unit Residential Properties
  • Retail and Office Buildings
  • Municipal and Government Facilities
  • Healthcare and Educational Institutions
  • Manufacturing and Warehouse Operations

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 durability, while the comprehensive wire range compatibility and lever bypass provision provide professional installation flexibility and maintenance convenience for demanding electrical applications.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket With Main
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Equipment Ground:
2 Barrel Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Closing Plate
Insulation:
Glass Polyester
Line Side Wire Range:
4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
Load Side Wire Range:
Two 3/0 AWG - 500 kcmil
Main Breaker Size:
One 400 Ampere Main Breaker
Number Of Main Breakers:
1
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Product Height:
34 IN
Product Length:
6 IN
Product Size:
6L x 36.25W x34H
Product Type:
Ringless Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
Single Mechanical
Unspsc Number:
39121102
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
36.25 IN
Department:
Electrical
Product Subgroup:
Electrical
Insulation Type:
Glass Polyester
Hub Style:
Large Closing Plate
Installation Category:
Surface Mount
Terminal Type:
Single Mechanical
Product Details:
Ringless Meter Socket
Frequency:
60 hertz

Milbank U6227-X-400-K3L-5T9 – Frequently Asked Questions

1) Do I need the 4 terminal or the 7 terminal Milbank U6227 series meter socket?
Terminal count is set by the utility's meter form, not by you, so pull the service requirement before ordering. The 4 terminal versions (U6227-X-400-K3L, and U6228-X-400-K3L for 480V) cover single phase self contained metering. The 7 terminal versions (U6229-X-400-K7L, and U6230-X-400-K7L side bussed) cover three phase four wire metering. There is also a 4 terminal with a 5th terminal at the 9 o'clock position, U6227-X-400-K3L-5T9, which some utilities specify for neutral or transformer rated sensing. Wrong terminal count and the meter will not seat.
2) What size conductors can I land in a Milbank 400A ringless meter socket with main breaker?
Line side takes 4 AWG through 600 kcmil in a single connector, or two conductors of 1/0 AWG through 250 kcmil if you are running parallel service entrance. Load side is set up for two conductors, 3/0 AWG through 500 kcmil each. That load side arrangement is worth noting before you plan the job: it is a dual lug configuration, so a 400A service feeding a single set of conductors and a service feeding two sets both land here. Terminals are single mechanical type, and grounding is a 2 barrel ground lug.
3) Will a Milbank ringless meter socket work if my utility requires a ringed socket?
No. Ringless and ringed are not interchangeable, and the utility dictates which one goes on their service. A ringless socket uses a full cover secured under a sealing tab rather than a locking ring around the meter, and a utility that specifies ring type will fail the inspection. Confirm the socket style on the utility's service requirements sheet before ordering; if they call for ring type, this Milbank U6227 series is the wrong unit.
4) Can I use the Milbank U6228-X-400-K3L meter socket on a 480V service?
The U6228-X-400-K3L is the 480V variant of the 4 terminal configuration. The other four in the family, the U6227 4 terminal, the U6227 with 5th terminal at 9 o'clock, and the U6229 and U6230 7 terminal units, are not the 480V unit. Voltage class on a meter socket is not a field change, so pick the right MPN at order time. All five run at 60 Hertz.
5) How much wall space do I need for a Milbank U6227 400A meter socket with main breaker?
Plan for a footprint of 6L x 36.25W x 34H inches. That 36.25 inch width is the number that catches people out on a retrofit, because a plain 200A socket is roughly a third of that. Check your wall run, any adjacent gas meter or window clearance, and the working space in front before you commit. The 6 inch depth is shallow enough for most exterior walls.
6) What does lever bypass do on a meter socket and do I need it?
Lever bypass lets the utility or an electrician pull the meter without dropping power to the building. Throwing the lever shunts current around the meter socket jaws so the load stays energized during meter change or testing. Many utilities require bypass on services at this amperage, and for occupied commercial or multi family buildings it is the difference between a meter swap and an outage notice to every tenant. This Milbank socket comes with lever bypass built in.
7) Does the Milbank 400A meter socket come with a hub or do I have to order the conduit fitting separately?
It ships with a large closing plate, not a hub. The plate covers the top opening and gets drilled or swapped for the hub that matches your service conduit, so budget for the hub as a separate line item on the order. Large closing plate is the right choice for a 400A service because it accepts the bigger hub sizes that 600 kcmil service entrance conduit needs.
8) Can I feed more than one meter or add a subpanel position to this Milbank socket?
One meter only. It is a single position socket with one main breaker and no receptacles, so it meters and protects a single service. If you are metering multiple tenants in a multi family or strip retail building, you need a multi position meter stack or a modular metering assembly, not this unit. Where this one fits is a single large service: one 320A continuous tenant, a house panel, or a commercial building fed as one service.
9) What is the U6230-X-400-K7L side bussed option for?
Side bussed on the U6230-X-400-K7L means the bus is arranged to feed from the side rather than straight through, which is what you want when the socket sits next to other gear in a lineup or where the service entrance approaches laterally instead of from directly above or below. The standard 7 terminal unit without side bussing is the U6229-X-400-K7L. Both are 7 terminal, so the meter form is the same; the difference is how the conductors route into it.
10) Is the Milbank U6227 meter socket durable enough for a coastal or industrial site?
The enclosure is G90 galvanized steel with a powder coat finish over it, which is a two layer corrosion system: the zinc coating on the steel plus the paint. Internal insulation is glass polyester, a thermoset that holds up to heat and tracking better than a plain phenolic. That construction plus the Type 3R rating covers normal outdoor exposure. For a heavy salt or chemical environment, most specs call for stainless or a Type 4X enclosure instead.
How fast can I get the Milbank U6227-X-400-K3L-5T9 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 U6227-X-400-K3L-5T9 come with a warranty?
Absolutely. The Milbank U6227-X-400-K3L-5T9 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 U6227-X-400-K3L-5T9?
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 U6227-X-400-K3L-5T9 from ZenSupply?
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