Milbank 320A 3-Phase Ringless ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,383.93
Milbank U3566-X-HSP 7 Terminal Ringless 38.75x6x20.25 Large Closing Plate Lever Bypass Stainless Steel Hasp

Milbank 320A 3-Phase Ringless Meter Socket with Lever Bypass and Stainless Steel Hasp

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Model: U3566-X-HSP

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

$1,383.93
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Milbank 320A 3-Phase Ringless Meter Socket with Lever Bypass and Stainless Steel Hasp

Professional metering solution with integrated bypass capability

The Milbank 320A 3-Phase Ringless Meter Socket delivers reliable electrical metering with professional-grade construction. Featuring a 320 continuous ampere rating and 3-phase 600V AC capability, this surface-mount meter socket includes lever bypass functionality and stainless steel hasp for secure operation. The G90 galvanized steel construction with powder coat finish and Type 3R rating ensures durability in demanding applications.

Professional Features & Benefits

  • 320 Continuous Ampere Rating: Handles high-capacity electrical loads for commercial and industrial applications with reliable performance.
  • 3-Phase 600V AC Operation: Supports three-phase power systems commonly used in commercial facilities and industrial installations.
  • Lever Bypass Provision: Enables safe meter maintenance and replacement without interrupting power service to critical loads.
  • Type 3R Enclosure Rating: Weather-resistant construction suitable for outdoor installations with protection against rain and ice formation.
  • G90 Galvanized Steel Construction: Corrosion-resistant material with powder coat finish provides long-lasting durability and professional appearance.
  • 7 Terminal Ringless Design: Accommodates various wiring configurations with 1/2 inch stud line side terminals for secure connections.
  • UL Listed Certification: Meets rigorous safety standards for electrical equipment ensuring code compliance and reliable operation.

Technical Specifications

  • Amperage Rating: 320 Continuous Ampere
  • Application: Meter Socket
  • Brand Name: Milbank
  • Bypass Provision: Lever Bypass
  • Cable Entry: Overhead or Underground
  • Departent: Electrical
  • Equipment Ground: Grounding Stud
  • Frequency Rating: 60 Hertz
  • Hub Closing Plate: Large Closing Plate
  • Insulation: Glass Polyester
  • 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: 38.75 IN
  • Product Length: 6 IN
  • Product Material: G90 Galvanized Steel with Powder Coat Finish
  • Product Mounting: Surface Mount
  • Product Size: 6L x 20.25W x38.75H
  • Product Type: Ringless Meter Socket
  • Standard: UL Listed;Type 3R
  • Terminal: 1/2 Inch Stud Line Side
  • Unspsc Number: 39121102
  • Voltage Rating: 600 Volts Alternating Current
  • Width: 20.25 IN

Professional Applications

  • Commercial Building Electrical Service
  • Industrial Facility Power Distribution
  • Multi-Tenant Properties
  • Retail and Office Buildings
  • Manufacturing Facilities
  • Institutional Buildings
  • High-Capacity Residential Applications

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 professional-grade design supports demanding electrical applications with confidence.

Manufacturer Resources

Product Specs

Amperage Rating:
320 Continuous Ampere
Application:
Meter Socket
Brand Name:
Milbank
Bypass Provision:
Lever Bypass
Cable Entry:
Overhead or Underground
Equipment Ground:
Grounding Stud
Frequency Rating:
60 Hertz
Hub Closing Plate:
Large Closing Plate
Insulation:
Glass Polyester
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:
38.75 IN
Product Length:
6 IN
Product Size:
6L x 20.25W x38.75H
Product Type:
Ringless Meter Socket
Standards:
UL Listed;Type 3R
Terminal:
1/2 Inch Stud Line Side
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:
20.25 IN
Department:
Electrical
Product Subgroup:
Metering & Meter Sockets
Product Group:
Power Distribution

Milbank U3566-X-HSP – Frequently Asked Questions

1) Will the Milbank U3566-X-HSP meter socket work on a 3-phase 4-wire service?
The U3566-X-HSP is a 7 terminal socket rated 3 phase, 600V AC, 60 Hz, which is the jaw configuration used for 3-phase 4-wire self-contained metering. It is a single meter position, so one tenant or one service per can. If your utility requires a 5 jaw (3-phase 3-wire) or 4 jaw single-phase socket, this is not the right can.
2) Does this 320 amp Milbank socket include a main breaker or disconnect?
No. The U3566-X-HSP is a meter socket only, with no main breaker and no receptacles. The lever bypass lets you pull or change the meter without dropping the load, but it is not a service disconnect. You still need separate overcurrent protection downstream (or a meter-main combination unit if you want both in one enclosure).
3) Can this meter socket be fed from underground, or is it overhead only?
Either. Cable entry is rated for overhead or underground, and the can ships with a large hub closing plate so you can install the hub your utility specifies for an overhead drop or leave it closed for a lateral feed. The hub itself is a separate item sized to your conduit.
4) Is the Milbank U3566-X-HSP rated for outdoor installation?
Yes. It carries a Type 3R rating and is UL Listed, so it is suited to outdoor walls with protection against rain and ice. The shell is G90 galvanized steel with a powder coat finish. For washdown or hose-directed areas you would want a 4 or 4X rated enclosure instead.
5) What size lugs or conductors do the line side terminals on this 320A socket take?
Line side connections are 1/2 inch stud type terminals, so you land ring or compression lugs rather than setscrew barrels. Size the lugs and conductors for the 320 continuous ampere rating. An equipment grounding stud is provided in the can for your grounding electrode or bonding conductor.
6) What wall space do I need to mount the Milbank U3566-X-HSP?
Plan for a surface-mounted enclosure measuring 6L x 20.25W x 38.75H inches. The 38.75 inch height is what usually catches people out on a crowded riser or between a window and a meter base, so lay that out before you set anchors. Mounting is to the wall surface, not flush.
7) What does ringless mean on a meter socket, and will my utility accept it?
Ringless means the cover slides over the meter and is secured to the enclosure rather than being clamped by a sealing ring around the meter rim. Utilities specify one or the other, so confirm your serving utility's approved list before ordering. The U3566-X-HSP is the ringless style and includes a stainless steel hasp for the utility seal or a padlock.
8) Why would I pay for a lever bypass version of this socket instead of a plain one?
The lever bypass lets a tech shunt the meter and pull it for testing or replacement without interrupting power to the load. On a tenant panel, a data room, or a manufacturing line where a meter swap would otherwise mean a planned outage, that is the whole reason to spec it. Many utilities also require bypass on 320 amp class metering.
9) Can I use this one can to meter two tenants in a duplex or small strip center?
No. The U3566-X-HSP has a single meter position. Multi-tenant buildings need either one socket per tenant or a multi-position meter pack / modular metering stack sized for the number of tenants and the phase configuration.
10) What is the insulation on the meter jaws in this Milbank socket?
The jaw block uses glass polyester insulation, which is the standard thermoset material for 320 amp class sockets and holds up to the heat cycling a continuous high-amp service puts on the base. Meter mounting hardware is contained in the 7 terminal ringless base.
How fast can I get the Milbank U3566-X-HSP 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 U3566-X-HSP come with a warranty?
Absolutely. The Milbank U3566-X-HSP 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 U3566-X-HSP?
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 U3566-X-HSP from ZenSupply?
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