Milbank 3-Phase Ringless Meter...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,000.23
Milbank U4427-XL-21 13 Terminal Ring Type Small Closing Plate Test Switch Prewired

Milbank 3-Phase Ringless Meter Socket 20A 600V 13-Terminal with Small Closing Plate

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Model: U4427-XL-21

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

$2,000.23
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Milbank 3-Phase Ringless Meter Socket 20A 600V 13-Terminal with Small Closing Plate

Professional 3-Phase Metering Solution for Commercial Applications

The Milbank 3-Phase Ringless Meter Socket delivers reliable 20 continuous ampere service at 600V AC for professional electrical installations. Featuring robust G90 galvanized steel construction with powder coat finish and Type 3R enclosure rating, this surface-mount meter socket provides dependable performance in demanding commercial environments. The 13-terminal configuration with glass polyester insulation ensures secure connections for both overhead and underground cable entry applications.

Professional Features & Benefits

  • 20 Continuous Ampere Rating: Provides reliable current handling capacity for commercial 3-phase electrical systems and metering applications.
  • 600V AC 3-Phase Configuration: Supports high-voltage commercial installations with professional-grade electrical performance and safety.
  • G90 Galvanized Steel with Powder Coat: Delivers superior corrosion resistance and long-term durability in outdoor and industrial environments.
  • Type 3R Enclosure Rating: Ensures protection against rain, sleet, and ice formation while maintaining reliable operation in harsh weather conditions.
  • 13-Terminal Design: Accommodates comprehensive 3-phase metering connections with secure mechanical terminals for professional installations.
  • Glass Polyester Insulation: Provides excellent electrical isolation and thermal stability for safe, reliable long-term operation.
  • UL Listed Certification: Meets rigorous safety standards for commercial electrical installations and code compliance requirements.

Technical Specifications

  • Amperage Rating: 20 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: No Bypass
  • Cable Entry: Overhead or Underground
  • Departent: Electrical
  • Equipment Ground: 2 Barrel Ground Lug
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Small Closing Plate
  • Insulation: Glass Polyester
  • Line Side Wire Range: 12 - 1/0 AWG
  • Load Side Wire Range: 12 - 1/0 AWG
  • Main Breaker Size: No Main Breaker
  • Number Of Jaws: 13 Terminal
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 3 Phase
  • Product Family Code: CT20
  • Product Height: 20 IN
  • Product Length: 4.125 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 4.125L x 12W x20H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 12 IN

Professional Applications

  • Commercial Building Electrical Metering
  • Industrial Facility Power Monitoring
  • Multi-Tenant Property Installations
  • Retail and Office Complex Metering
  • Manufacturing Plant Electrical Distribution
  • Warehouse and Distribution Center Applications
  • Professional Service Building Installations

Why Choose Milbank Quality?

Milbank delivers proven reliability through UL Listed certification and Type 3R weather protection, ensuring dependable performance in demanding commercial environments. The robust G90 galvanized steel construction with powder coat finish provides long-term durability and corrosion resistance for professional electrical installations.

Manufacturer Resources

Product Specs

Amperage Rating:
20 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
No Bypass
Cable Entry:
Overhead or Underground
Equipment Ground:
2 Barrel Ground Lug
Frequency Rating:
60 Hertz
Hub Closing Plate:
Small Closing Plate
Insulation:
Glass Polyester
Line Side Wire Range:
12 - 1/0 AWG
Load Side Wire Range:
12 - 1/0 AWG
Main Breaker Size:
No Main Breaker
Number Of Jaws:
13 Terminal
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
3 Phase
Product Family Code:
CT20
Product Height:
20 IN
Product Length:
4.125 IN
Product Size:
4.125L x 12W x20H
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:
20
Product Width:
12 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Product Group:
Power Distribution

Milbank U4427-XL-21 – Frequently Asked Questions

1) Why is the Milbank U4427-XL-21 meter socket only rated 20 amps if it's for commercial 600V service?
Because it's a CT-rated socket, not a self-contained one. The U4427-XL-21 carries a 20 continuous ampere rating at 600V AC, 60 Hz, which is the instrument-transformer secondary current, not the building's service current. The actual load current is measured by separate current transformers and the socket only handles the CT secondary wiring to the meter. If you need a socket that carries full service current directly, you want a self-contained 100A, 200A or 320A socket instead.
2) What size wire can I land in the Milbank 13-terminal CT meter socket?
Both line and load sides accept 12 AWG through 1/0 AWG in single mechanical terminals. Grounding is handled by two barrel ground lugs. That range covers typical CT secondary and control conductors; it will not take service-entrance size cable, which is consistent with this being a CT-rated 20A socket rather than a self-contained one.
3) Can the U4427-XL-21 be mounted outdoors on an exterior wall?
Yes. It's a surface-mount enclosure in G90 galvanized steel with a powder coat finish, UL Listed and rated Type 3R, so it's built for rain, sleet and ice exposure on an exterior wall. Flush or recessed mounting is not what this enclosure is built for.
4) Is a main breaker or meter bypass included in the Milbank U4427-XL-21?
No to both. It has no main breaker (zero breaker positions), no bypass provision, and no receptacles. Overcurrent protection and any service disconnect have to be provided separately downstream or upstream, depending on your utility's arrangement. If your utility requires a lever bypass for hot meter changes, this is not the socket to specify.
5) Does a 13-terminal socket work for 3-phase 4-wire metering?
The 13-terminal jaw configuration is the 3-phase arrangement used for transformer-rated metering, and the socket is specified as 3 phase, single meter position. Confirm the terminal count against the meter your serving utility intends to set, since utilities dictate the socket pattern.
6) Can I bring conductors in from overhead, or does this have to be an underground feed?
Either works. Cable entry is rated for overhead or underground, and the socket ships with a small hub closing plate so the top opening is closed off when you don't need an overhead hub. For an overhead service you remove the closing plate and fit the appropriate hub for your conduit size, which is ordered separately.
7) What wall space do I need to plan for this Milbank CT meter socket?
Plan for a footprint of 4.125 in deep by 12 in wide by 20 in high. The height is the number that usually drives the layout, since the meter center has to land in the utility's required window above finished grade.
8) What does ringless mean on a Milbank meter socket, and will my utility accept it?
Ringless means the meter is retained by a sealable outer cover rather than a locking ring clamped around the meter rim. The U4427-XL-21 is a ringless design. Utilities specify one or the other by territory, so verify your serving utility accepts ringless before ordering; where a ring type is required, the socket style has to match, not just the terminal count.
9) Is the Milbank U4427-XL-21 suitable for metering a multi-tenant building?
Only as a single service point. It has one meter position, so it meters one service. Multi-tenant work with individual tenant meters needs a multi-position meter stack or ganged sockets instead. Where this socket fits a multi-tenant property is metering the house or main service through current transformers.
10) What insulates the jaws in this Milbank CT socket, and does it hold up at 600 volts?
The jaw block is glass polyester, which gives the dielectric strength and thermal stability needed for the socket's 600 volt AC rating. It's the same material family used across Milbank's transformer-rated sockets for heat resistance behind the meter.
How fast can I get the Milbank U4427-XL-21 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 U4427-XL-21 come with a warranty?
Absolutely. The Milbank U4427-XL-21 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 U4427-XL-21?
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 U4427-XL-21 from ZenSupply?
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