B-Line U214 MTBPL Eaton series meter breakers, 100 A, Test block, Ring type, 3R, ANSI 61 gray painted, 010 kAIC, #6-250 MCM, MCB, Galvanized steel, Surface mount, 7 jaws, 1 position, 3Ø/4W, Overhead feed

Yes. The U214 MTBPL is built for 3-phase, 4-wire service and uses a 7-jaw meter socket, which is the jaw count utilities specify for 3-phase 4-wire metering. It is a single position unit rated 100 A with a main circuit breaker. If your service is single phase, this is the wrong jaw configuration and you want a 4-jaw or 5-jaw socket instead.

It is a Type 3R enclosure, so it is rated for outdoor use against rain and falling water. The housing is galvanized steel with an ANSI 61 gray painted finish, and it mounts on the surface of the wall rather than flush into it. Feed is overhead, so the service conductors come in from above, which suits a weatherhead and mast drop rather than an underground lateral.

The lugs accept #6 AWG through 250 MCM, which covers the usual copper and aluminum runs for a 100 A three phase service with room to oversize for voltage drop on a long run. Anything larger than 250 MCM will not terminate in this unit.

Both. The U214 MTBPL uses a ring type meter socket, meaning the meter is retained by a sealing ring rather than a ringless cover, and it includes a test block so the utility can test or bypass metering without pulling the meter. Utilities are specific about ring versus ringless, so confirm which one your serving utility requires before ordering.

Plan for a footprint of 26 in high by 20 in wide, with 4.625 in of depth off the wall. It weighs 50 lb, so it is a two-person lift to hold on the wall while the mounting fasteners go in, particularly at meter height on an exterior wall.

No. This is a meter breaker, so the main circuit breaker is built into the same enclosure as the 100 A, 7-jaw meter socket. Meter and service disconnect are combined in one surface mounted 3R housing, which is why it is commonly used where a single service disconnect has to sit outside at the meter.

Order by the Eaton B-Line catalog number U214 MTBPL. That designation carries the 100 A rating, the 7-jaw 3-phase 4-wire ring type socket with test block, the 3R galvanized steel enclosure, and overhead feed. Change any one of those (single phase, ringless, underground feed) and it is a different catalog number.