Eaton 127 TB MS20 Single Meter Socket - UL Listed
Part Number: 127 TB MS20
Quick Summary
Eaton B-Line series single meter sockets deliver reliable, ready-to-install metering for commercial and industrial electrical distribution. Engineers often struggle with space constraints, wiring management, and maintenance access in meter enclosures, especially in retrofit projects or tight service entrances. This product carries UL listing, EUSERC approval, and a 3R enclosure rating to address regulatory and environmental demands for indoor and outdoor use. With 200 A service, 3Ø/4W configuration, and seven jaws, it accommodates #6-250 MCM lugs while offering a ring bypass for efficient testing. Built from galvanized steel with ANSI 61 gray paint finish, it combines durability with ease of installation, helping reduce field labor and improve long-term reliability in critical facilities.
Product Information
Extended Description
127 TB MS20 Eaton: Eaton B-Line series single meter sockets, Test block, 200 A, #6-250 MCM, #6-250 MCM, Ring, 3R, Z3614, Galvanized steel, Surface mount, 3Ø/4W, 7 jaws, 1 Position
Product Name
Eaton B-Line series single meter sockets
Catalog Number
127 TB MS20
UPC
782051311051
Product Length/Depth
6 in
Product Height
30 in
Product Width
14 in
Product Weight
38 lb
Compliances
EUSERC Approved
Certifications
UL
Amperage rating
200 A
Material
Galvanized steel
Finish
ANSI 61 gray paint Mill-galvanized
Number of jaws
7
Number of wires
3Ø/4W
Bypass
Test block
Mounting method
Surface mount
Number of positions
1
Line lug size
#6-250 MCM
Load lug size
#6-250 MCM
Cover/door type
Ring
Special features
Ring protector
Degree of protection
3R
200 A service with a 3Ø/4W configuration enables scalable metering for mid-to-large commercial and light industrial loads. This capacity supports future demand without mid-life meter upgrades, reducing total cost of ownership and downtime. The unit uses seven jaws and #6-250 MCM lugs, providing flexible conductor options for service entrances in industrial facilities, data centers, and multi-tenant buildings. Built to endure frequent connections and disconnections, it helps maintain metering accuracy over the life of the installation. Ring bypass with a test block simplifies commissioning and routine maintenance by allowing meter testing without interrupting load. This reduces outage duration, speeds fault isolation, and improves commissioning reliability in critical environments such as manufacturing lines and data centers. The ring protector feature enhances safety during live-testing scenarios, while the bypass remains accessible for service technicians. Galvanized steel with ANSI 61 gray paint finish delivers durable corrosion resistance in both indoor and outdoor installations. UL listing, EUSERC approval, and the 3R enclosure rating provide regulatory confidence, facilitate utility coordination, and simplify compliance during audits. The combination of rugged construction and recognized certifications translates into lower risk, fewer field disputes, and a longer service life in challenging environments. Surface-mount installation with a 6 in depth, 14 in width, and 30 in height footprint helps with space planning in tight service rooms and equipment bays. Lugs sized for #6-250 MCM ensure broad conductor compatibility, while a single-position design supports future expansion. The overall footprint reduces installation time, minimizes required enclosure mods, and improves consistency across facilities. From onboarding to ongoing maintenance, the 127 TB MS20 delivers measurable value: faster deployment, durable performance, and compliant operation across electrical distribution networks. Pair it with Eaton B-Line enclosures to standardize metering across facilities, streamline procurement, and improve serviceability for engineering teams and maintenance crews. In utility interconnection projects, the UL/EUSERC certifications help support faster approvals and smoother outage scheduling.
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FAQs
Yes. The 127 TB MS20 is rated for 200 A service and uses #6-250 MCM lugs with seven jaws, making it compatible with standard service entrances in mid-to-large commercial and light industrial panels. Its surface-mount design supports straightforward retrofits and new installs without specialized enclosure modification.
Key specs include 200 A amperage rating, 3Ø/4W wiring, seven jaws, ring bypass capability for testing without load interruption, and compatibility with #6-250 MCM line and load lugs. It is UL listed and EUSERC approved, with a 3R enclosure rating for reliable protection in varied environments.
Ideal for service entrances in office buildings, data centers, and manufacturing facilities where reliable metering is essential. Its 3R enclosure rating supports both indoor and outdoor applications, while the ring bypass and test block streamline commissioning and maintenance in mission-critical environments.
The socket is UL listed, EUSERC approved, and rated 3R, providing regulatory alignment with utility requirements and building codes. These certifications reduce audit risk, ease utility coordination, and support faster project approvals and commissioning in regulated environments.
The ring bypass enables testing without disconnecting the load, reducing downtime and commissioning time. Its rugged galvanized steel construction and proven certifications minimize field disputes and maintenance issues, delivering lower lifecycle costs and greater planning predictability for engineering and maintenance teams.