B-Line U227 MTBL Eaton series meter breakers, 100 A, Test block, Ring type, 3R, ANSI 61 gray painted, 010 kAIC, #14-2/0, MCB, Galvanized steel, Side, 7 jaws, 3 poles, 3Ø/4W, Overhead and underground feed

Yes. The U227 MTBL is a Type 3R enclosure, which is the rain-tight rating used for exterior service equipment on a building wall. The shell is galvanized steel finished in ANSI 61 gray paint, and it accepts either an overhead or an underground service feed, so the same unit works whether the drop comes down from a mast or up from a lateral.

It is a 7 jaw socket wired for 3 phase, 4 wire service, with a 3 pole main circuit breaker. A 7 jaw socket is the standard configuration for a 3-phase 4-wire self-contained meter, so it will not accept a 4 jaw or 5 jaw single-phase meter. If the utility is setting a single-phase meter on this service, you need a different socket configuration.

The U227 MTBL is a ring type socket with a test block, and it is EUSERC Approved, which is the specification most western US utilities write into their service equipment requirements. It is also UL listed. Ring type versus ringless is a utility call, so confirm your local utility's meter socket cover requirement before ordering; if their standard is ringless, this unit is the wrong one.

The lugs take #14 through 2/0 copper or aluminum conductors. That covers typical service entrance runs up to 2/0, but if your engineer has sized the run larger than 2/0 for voltage drop or derating, the terminals will not accept it and you will need a unit with larger lug capacity or a separate tap box.

Plan for 32 inches high by 27 inches wide, with 6 inches of depth off the wall. It weighs 80 pounds, so it is a two-man lift to set and hold on the wall while the mounting fasteners go in. The shallow 6 inch depth keeps it tight to the wall but still leaves the working clearance requirement in front to sort out on site.

Yes, that is what a meter breaker is. The U227 MTBL puts the ring type meter socket and a 3 pole main circuit breaker in a single Type 3R can, so you get utility metering and the service disconnect in one wall-mounted assembly instead of a separate socket plus a disconnect and the nipple and conductors between them. Branch distribution still has to live in a downstream panel.

Side refers to the wiring or gutter position on the enclosure, which determines which side your service and load conductors route through, so orient the unit accordingly when you lay out the conduit penetrations. The unit is also furnished with a test block, which is what lets the utility test or bypass the meter without pulling the service.