Milbank 4 Terminal Ringless Me...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$6,564.34
Milbank U5797-O-400-CB 4 Terminal Ringless Plain Top Lever Bypass 1-400 Ampere Main Breaker 480 Volt Cold Sequence

Milbank 4 Terminal Ringless Meter Socket with 400A Main Breaker 480V 1-Phase Lever Bypass System

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Model: U5797-O-400-CB

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

$6,564.34
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Milbank 4 Terminal Ringless Meter Socket with 400A Main Breaker 480V 1-Phase Lever Bypass System

Professional electrical metering and main breaker protection with lever bypass functionality

The Milbank 4 Terminal Ringless Meter Socket delivers reliable electrical metering and main breaker protection for 480V single-phase applications. This professional-grade meter socket features a 400 ampere main breaker with lever bypass provision, housed in a durable G90 galvanized steel enclosure with powder coat finish rated for Type 3R outdoor applications. The surface-mount design accommodates underground cable entry with comprehensive wire range compatibility from 4 AWG to 600 kcmil.

Professional Features & Benefits

  • 400 Ampere Main Breaker: Provides reliable overcurrent protection and electrical isolation for safe maintenance operations.
  • Lever Bypass Provision: Enables continuous power during meter maintenance without service interruption for critical applications.
  • 4 Terminal Ringless Design: Simplifies installation and reduces connection points while maintaining secure electrical contact.
  • Type 3R Enclosure Rating: Weather-resistant construction protects internal components from rain, sleet, and outdoor environmental conditions.
  • G90 Galvanized Steel Construction: Corrosion-resistant material with powder coat finish ensures long-term durability and professional appearance.
  • UL Listed Certification: Meets rigorous safety standards for reliable performance in commercial and industrial electrical systems.
  • Underground Cable Entry: Accommodates below-grade electrical service connections with appropriate sealing and protection.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket With Main
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Underground
  • Departent: Electrical
  • Equipment Ground: Grounding Stud
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Plain Top
  • Insulation: Glass Polyester
  • Line Side Wire Range: Two 3/0 AWG - 500 kcmil
  • Load Side Wire Range: 4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
  • Main Breaker Size: One 400 Ampere Main Breaker
  • Number Of Jaws: 4 Terminal
  • Number Of Main Breakers: 1
  • Number Of Meter Positions: 1 Position
  • Number Of Receptacles: 0
  • Phase: 1 Phase
  • Product Family Code: COLBD
  • Product Height: 36 IN
  • Product Length: 6 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6L x 26W x36H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: Single Mechanical
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 26 IN

Professional Applications

  • Commercial Building Electrical Service
  • Industrial Facility Power Distribution
  • Multi-Unit Residential Properties
  • Retail and Office Buildings
  • Manufacturing and Processing Facilities
  • Municipal and Government Buildings
  • Educational Institution Power Systems

Why Choose Milbank Quality?

Milbank delivers proven reliability through UL Listed certification and Type 3R weather-resistant construction. The G90 galvanized steel enclosure with powder coat finish provides long-term durability, while the glass polyester insulation and grounding stud ensure safe, code-compliant electrical connections for professional installations.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket With Main
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Underground
Equipment Ground:
Grounding Stud
Frequency Rating:
60 Hertz
Hub Closing Plate:
Plain Top
Insulation:
Glass Polyester
Line Side Wire Range:
Two 3/0 AWG - 500 kcmil
Load Side Wire Range:
4 AWG - 600 kcmil or Two 1/0 AWG - 250 kcmil
Main Breaker Size:
One 400 Ampere Main Breaker
Number Of Jaws:
4 Terminal
Number Of Main Breakers:
1
Number Of Meter Positions:
1 Position
Number Of Receptacles:
0
Phase:
1 Phase
Product Family Code:
COLBD
Product Height:
36 IN
Product Length:
6 IN
Product Size:
6L x 26W x36H
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:
320
Product Width:
26 IN
Department:
Electrical
Product Subgroup:
Electrical

Milbank U5797-O-400-CB – Frequently Asked Questions

1) Will a Milbank U5797-O-400-CB meter socket work on a 480V single-phase service?
The U5797-O-400-CB is built for 480V 1-phase, 60 Hz service, with a 4 terminal jaw configuration and a 600 VAC insulation rating on the enclosure components. It is a single meter position with one main breaker. If the service is three phase, this is the wrong socket, a 4 terminal single phase can will not accept a 3-phase meter form.
2) Is the Milbank U5797-O-400-CB a 400 amp service or a 320 amp service?
Both numbers are real and they mean different things. The breaker is one 400 ampere main, which is the interrupting device size, while the socket carries a 320 continuous ampere rating. 320 continuous is the number the utility and the load calculation work from on a 400A class residential or light commercial service. Size the service as 320 continuous, not 400.
3) What size conductors land in the Milbank U5797-O-400-CB line and load lugs?
Line side takes two conductors per phase, 3/0 AWG through 500 kcmil. Load side takes a single 4 AWG through 600 kcmil, or two conductors of 1/0 AWG through 250 kcmil. Lugs are single mechanical type. So a parallel 350 kcmil feed on the line side lands fine, but a parallel 350 on the load side does not, the dual-conductor load lug tops out at 250 kcmil.
4) Do I still need a separate panel after the Milbank U5797-O-400-CB, or does it feed branch circuits?
You still need a panel. This is a meter socket with main only, one main breaker and zero receptacle or branch breaker positions in the can. It gives you the meter, the service disconnect and overcurrent protection at the service point, then a single load-side feeder out to a distribution panel or panels downstream. If you want metering and branch breakers in one enclosure, that is a meter load center, not this.
5) What is a lever bypass meter socket and do I need one?
Lever bypass lets the meter be pulled and the socket stay energized through the bypass, so the building keeps power while the utility swaps or tests the meter. That matters on anything you cannot dark down: occupied multi-family, medical, refrigeration, data closets. Many utilities also mandate bypass at 320 continuous ampere class services. The U5797-O-400-CB carries lever bypass as standard. If the utility does not require it and the load tolerates an outage, a non-bypass socket is the simpler can.
6) How much wall space does the Milbank U5797-O-400-CB need?
Plan on 6 x 26 x 36 inches, surface mounted, with the 36 inch figure the height and the 26 inch figure the width. It hangs on the wall rather than recessing into it, so the 6 inches stands proud of the finished surface. Add your working clearance in front per code, and remember the meter center has to land in the utility's readable height window.
7) Can this Milbank 400A meter main be mounted outdoors on an exterior wall?
Type 3R, so yes, outdoor wall mounting is what it is built for. The enclosure is G90 galvanized steel with a powder coat finish, and the whole assembly is UL Listed. Type 3R sheds rain, sleet and snow, it is not a washdown or hosedown rating, so keep it off of pressure-wash zones and out of standing water.
8) Does a ringless meter socket need a ringless meter, or is that about the cover?
Ringless refers to how the cover is retained, not to the meter. A ringless can uses a hinged or lift-off cover that clamps the meter in place, instead of a separate sealing ring around the meter collar. The meter itself is selected by form and jaw count, and the U5797-O-400-CB is a 4 terminal socket. Utilities in a given territory usually specify ringless or ring type, so match whatever the utility's service requirements call out before ordering.
9) I need one meter can per tenant on a multi-tenant building, is this the right one?
Only if each tenant gets a separate can. The U5797-O-400-CB is a single meter position with one main, so on a multi-tenant property it serves one metered service at a time. For several tenants fed from one point, a multi-position meter stack or a group metering package is the right equipment. Where this fits multi-family is the house service, or a large single 480V 1-phase load at 320 continuous ampere.
10) How is the equipment ground and neutral bonded in the Milbank U5797-O-400-CB?
Ground terminates on a grounding stud in the enclosure, and the current-carrying parts are isolated on glass polyester insulation. That stud is where your grounding electrode conductor and equipment grounding conductors land at the service point. Bonding of the neutral to the can is a service-entrance decision made per NEC by the installer, not a feature of the socket.
How fast can I get the Milbank U5797-O-400-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 U5797-O-400-CB come with a warranty?
Absolutely. The Milbank U5797-O-400-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 U5797-O-400-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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