Milbank 320A 3-Phase Ringless ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,809.27
Milbank U4487-X-2/K6 7 Terminal Ringless Large Closing Plate Lever Bypass 2 Double Connector 6-350kcmil

Milbank 320A 3-Phase Ringless Meter Socket with Lever Bypass and Large Closing Plate (3)

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Model: U4487-X-2/K6

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

$1,809.27
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Milbank 320A 3-Phase Ringless Meter Socket with Lever Bypass and Large Closing Plate

Professional metering solution with lever bypass functionality

The Milbank 320A 3-Phase Ringless Meter Socket delivers reliable electrical metering with integrated lever bypass capability. This surface-mount unit features G90 galvanized steel construction with powder coat finish, 7-terminal configuration, and Type 3R enclosure rating for versatile indoor and outdoor applications. The large closing plate design accommodates overhead, underground, and side wireway cable entry options.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads for commercial and industrial applications with reliable performance.
  • 3-Phase Configuration: Supports three-phase power systems essential for commercial facilities and heavy equipment operations.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without interrupting power service to critical loads.
  • Type 3R Enclosure Rating: Weather-resistant construction protects internal components from rain, sleet, and ice formation in outdoor installations.
  • G90 Galvanized Steel with Powder Coat: Corrosion-resistant materials ensure long-term durability in harsh environmental conditions.
  • Double Mechanical Terminals: Secure wire connections accommodate 6 AWG to 350 kcmil conductors on both line and load sides.
  • UL Listed Certification: Meets rigorous safety standards for professional electrical installations and code compliance.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Overhead and Underground and Side Wireway
  • Departent: Electrical
  • Equipment Ground: Grounding Stud
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Closing Plate
  • Insulation: Glass Polyester
  • Line Side Wire Range: Two 6 AWG - 350 kcmil
  • Load Side Wire Range: Two 6 AWG - 350 kcmil
  • Main Breaker Size: No Main Breaker
  • Number Of Jaws: 7 Terminal
  • Number Of Main Breakers: 0
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 3 Phase
  • Product Family Code: 7T32
  • Product Height: 40 IN
  • Product Length: 6.5 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6.5L x 20W x40H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Double Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 20 IN

Professional Applications

  • Commercial Buildings and Office Complexes
  • Industrial Facilities and Manufacturing Plants
  • Multi-Unit Residential Properties
  • Retail and Shopping Centers
  • Healthcare and Educational Facilities
  • Municipal and Government Buildings
  • Data Centers and Telecommunications

Why Choose Milbank Quality?

Milbank meter sockets provide dependable electrical metering solutions backed by UL Listed certification and Type 3R weather-resistant construction. The G90 galvanized steel with powder coat finish ensures lasting performance in demanding environments, while the 7-terminal configuration and double mechanical terminals deliver secure, professional-grade connections for critical electrical infrastructure.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Overhead and Underground and Side Wireway
Equipment Ground:
Grounding Stud
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Closing Plate
Insulation:
Glass Polyester
Line Side Wire Range:
Two 6 AWG - 350 kcmil
Load Side Wire Range:
Two 6 AWG - 350 kcmil
Main Breaker Size:
No Main Breaker
Number Of Jaws:
7 Terminal
Number Of Main Breakers:
0
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
3 Phase
Product Family Code:
7T32
Product Height:
40 IN
Product Length:
6.5 IN
Product Size:
6.5L x 20W x40H
Product Type:
Ringless Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
Double Mechanical
Unspsc Number:
39121102
Voltage Rating:
600 Volts Alternating Current
Product Material:
G90 Galvanized Steel with Powder Coat Finish
Product Mounting:
Surface Mount
Amps:
320
Product Width:
20 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Product Group:
Power Distribution

Milbank U4487-X-2/K6 – Frequently Asked Questions

1) Will the Milbank U4487-X-2/K6 meter socket work on a 3-phase 4-wire service?
Yes. The U4487-X-2/K6 is a 7 terminal, 3 phase socket rated 600 VAC at 60 Hz, which is the standard jaw configuration for 3-phase 4-wire network metering. It holds one meter position. If your utility meters a 3-phase 3-wire service, it will specify a different jaw count, so match the socket to the utility's meter spec before ordering.
2) What size conductors will fit the lugs on this 320A Milbank meter socket?
Both line and load sides use double mechanical terminals accepting two conductors each, 6 AWG through 350 kcmil. That means you can land parallel 350 kcmil per phase, which is what a 320A continuous (400A rated) service typically needs. If your feeder runs larger than 350 kcmil per conductor, these lugs will not take it.
3) Does this Milbank socket include a main breaker or disconnect?
No. The U4487-X-2/K6 is a meter socket only, with no main breaker (zero breaker positions) and no receptacles. Overcurrent protection and the service disconnect have to come from a separate panel or disconnect downstream. What it does carry is a lever bypass, so the meter can be pulled and changed without dropping the load.
4) Can this Milbank ringless socket be used for an underground service lateral as well as overhead?
Yes, both. The large closing plate arrangement supports overhead, underground, and side wireway cable entry. For an overhead drop you remove the closing plate and install the hub your utility requires; for underground you can bring the lateral in through the bottom or from a side wireway.
5) Is a hub included with the U4487-X-2/K6, or do I have to order one separately?
It ships with a large closing plate covering the hub opening, not a hub. If the service comes in overhead through the top, the conduit hub is a separate item sized to your raceway and to whatever the serving utility approves. Underground entry needs no hub.
6) How much wall space do I need for this 320 amp Milbank meter socket?
Allow for a surface-mounted can measuring 6.5L x 20W x 40H inches. It is a tall unit, so plan the meter height to the utility's window-center requirement and confirm the 40 inch run clears any obstruction above and below the mounting point.
7) Is this Milbank meter socket rated for outdoor mounting on an exterior wall?
Yes. The enclosure is Type 3R and UL Listed, so it is built for rain, sleet and ice on an outdoor wall. The shell is G90 galvanized steel with a powder coat finish for corrosion resistance, and internal insulation is glass polyester. Type 3R is not a washdown or dust-tight rating, so it is not the choice for a hosed-down or heavily corrosive process area.
8) Why pick a ringless meter socket with a lever bypass instead of a ring-type socket without bypass?
Two separate decisions. Ringless means the cover is sealed by the utility rather than held by a locking ring, and many utilities now require ringless on new work, so follow their spec. The lever bypass is about service continuity: the meter can be removed for test or exchange while the load stays energized, which is what you want on a commercial building, data center or multi-tenant property that cannot take an outage. On a small service with no uptime requirement, a non-bypass socket is adequate.
9) Is the Milbank 7T32 socket suitable for a 400 amp class service?
It is rated 320 amps continuous, which is the standard continuous rating for a 400 amp class residential or light commercial service (400A class sockets are rated for 320A continuous load). Voltage rating is 600 VAC, so it covers 120/208 and 277/480 wye systems within that limit. For loads above 320A continuous you need a higher-rated socket or a CT-metered arrangement.
10) How is the equipment grounding conductor terminated in this Milbank socket?
There is a grounding stud in the enclosure for the equipment ground. If your installation calls for a bonded neutral and a separate ground bar with multiple terminations, you will need to add a ground bar kit; the socket as built provides the stud.
How fast can I get the Milbank U4487-X-2/K6 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 U4487-X-2/K6 come with a warranty?
Absolutely. The Milbank U4487-X-2/K6 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 U4487-X-2/K6?
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 U4487-X-2/K6 from ZenSupply?
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