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Milbank 13 Terminal Ring Type Meter Socket 20A 3 Phase 600V with 7/8" Barrel Lock Provision
Professional metering solution with secure barrel lock provision
The Milbank 13 Terminal Ring Type Meter Socket delivers reliable 3 phase metering performance with 20 continuous ampere rating and 600V AC capacity. Constructed with G90 galvanized steel and powder coat finish for durability, this UL Listed Type 3R enclosure features underground cable entry and glass polyester insulation for professional installations requiring secure metering access.
Professional Features & Benefits
- 20 Continuous Ampere Rating: Provides reliable current handling capacity for consistent metering performance in 3 phase applications.
- 600V AC Voltage Rating: Supports high voltage applications with professional-grade electrical safety and performance standards.
- 13 Terminal Configuration: Offers comprehensive connection points for complete 3 phase metering with proper grounding provisions.
- 7/8" Barrel Lock Provision: Includes knockout and angle bracket for secure utility access control and tamper resistance.
- G90 Galvanized Steel Construction: Delivers long-term corrosion resistance with powder coat finish for enhanced durability in outdoor environments.
- UL Listed Type 3R Rating: Meets professional safety standards for outdoor use with protection against weather conditions.
- Underground Cable Entry: Designed for underground service applications with appropriate cable management and sealing.
Technical Specifications
- Amperage Rating: 20 Continuous Ampere
- Application: Meter Socket
- Barrel Lock Provision: 7/8 Inch Knockout and Angle Bracket For Barrel Lock Provision
- Brand Name: Milbank
- Bypass Provision: No Bypass
- Cable Entry: Underground
- Departent: Electrical
- Equipment Ground: Ground Lug
- Frequency Rating: 60 Hertz
- Hub Closing Plate: Plain Top
- Insulation: Glass Polyester
- Line Side Wire Range: 12 - 10 AWG
- Main Breaker Size: No Breaker Provision
- 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: Ring Type 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 Metering
- Industrial Facility Power Monitoring
- Multi-Unit Residential Properties
- Underground Service Installations
- Municipal and Utility Applications
- Professional Office Buildings
- Retail and Commercial Establishments
Why Choose Milbank Quality?
Milbank delivers proven reliability with UL Listed Type 3R certification and robust G90 galvanized steel construction with powder coat finish. The professional-grade glass polyester insulation and comprehensive grounding provisions ensure long-term performance in demanding metering applications.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 20 Continuous Ampere
- Application:
- Meter Socket
- Brand Name:
- Milbank
- Bypass Provision:
- No Bypass
- Cable Entry:
- Underground
- Equipment Ground:
- Ground Lug
- Frequency Rating:
- 60 Hertz
- Hub Closing Plate:
- Plain Top
- Insulation:
- Glass Polyester
- Line Side Wire Range:
- 12 - 10 AWG
- Main Breaker Size:
- No Breaker Provision
- 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:
- Ring Type 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 UC4660-O-21-BLG – Frequently Asked Questions
1) Can the Milbank UC4660-O-21-BLG meter socket be used for a 3 phase 600V service?
Yes. The UC4660-O-21-BLG is a 3 phase socket rated 600 volts AC at 60 Hertz, with a 13 terminal jaw configuration and a single meter position. That 13 jaw arrangement is what a 3 phase instrument-transformer-rated metering installation uses, and the 20 continuous ampere rating reflects a CT-rated socket carrying secondary current, not full service load.
2) Is a 20 amp meter socket really enough for a commercial service?
It is, in the right application. The UC4660-O-21-BLG carries a 20 continuous ampere rating because it is a current-transformer metering enclosure in the CT20 family, so it handles CT secondary wiring rather than the full service conductors. That is also why the line side wire range is only 12 to 10 AWG. If you need a socket that carries the service conductors themselves, this is the wrong enclosure.
3) What size wire will the terminals in this Milbank CT metering socket accept?
Line side terminals take 12 to 10 AWG, using single mechanical lugs. That range suits CT secondary and potential leads. Anything heavier than 10 AWG will not land in these terminals. Equipment grounding is by a ground lug.
4) Is this Milbank meter socket rated for outdoor mounting?
Yes. It is UL Listed and Type 3R, which covers outdoor use with protection against falling rain and sleet. The enclosure is G90 galvanized steel with a powder coat finish, and the internal insulation is glass polyester.
5) Will the UC4660-O-21-BLG work for an overhead service drop?
No. This one is built for underground service, and the top is a plain top with no hub closing plate opening for a weatherhead riser. For an overhead feed you need a socket with a hub or hub opening in the top.
6) Does this Milbank socket include a bypass or a main breaker?
Neither. It is specified as no bypass and no breaker provision, with zero main breakers and no receptacles. If your utility requires a lever or horn bypass for hot meter changes, or you need overcurrent protection in the same can, you will need a different enclosure or separate gear downstream.
7) How much wall space do I need for the Milbank UC4660-O-21-BLG enclosure?
Plan on a footprint of 4.125 inches deep by 12 inches wide by 20 inches high. It is a surface mount enclosure, so you need a flat, solid backing surface and clearance below for the underground conduit run.
8) How does the utility lock this meter enclosure?
The cover carries a 7/8 inch knockout with an angle bracket for a barrel lock, which is the standard utility sealing arrangement for CT cabinets. The barrel lock itself is supplied by the serving utility, not with the enclosure.
9) What is the UNSPSC code for this Milbank meter socket for our procurement system?
It classifies under UNSPSC 39121102. The manufacturer part number is UC4660-O-21-BLG, brand Milbank, in the CT20 product family.
How fast can I get the Milbank UC4660-O-21-BLG 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 UC4660-O-21-BLG come with a warranty?
Absolutely. The Milbank UC4660-O-21-BLG 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 UC4660-O-21-BLG?
You can call, text, or email our expert support team for fast answers. We’re here to help with
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selection,
installation tips, and troubleshooting. Contact Us
Why buy the Milbank UC4660-O-21-BLG from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.