Milbank MTB-100 4-7 Terminal Ring-Type Small Closing Plate Link Bypass 1-100 Ampere Main Breaker

Terminal count. The 214MTB is the 4-terminal version and the 217MTB is the 7-terminal version, both in the 12 x 34 enclosure. The 4-terminal socket is the single-phase 3-wire configuration; 7 terminals is used for network or three-phase service depending on the utility's requirement. Your serving utility dictates which terminal count they will accept, so confirm the socket spec on their service requirements sheet before ordering.

Same electrical guts, different enclosure footprint. The 12 x 34 is a tall, narrow can (214MTB 4-terminal, 217MTB 7-terminal). The 18 x 25 is a shorter, wider can (U214MTB and U217MTB). Pick by the wall space and existing mounting pattern you are replacing, and by which dimension your utility's meter height requirement lets you land. Both are surface mount.

Yes, it is a ring-type meter socket, so it takes a standard sealing ring to retain the meter. If your utility specifies ringless sockets with a hinged cover, this is not the one they will accept. Ring versus ringless is a utility-by-utility call and they will refuse to set a meter on the wrong style.

Link bypass lets the utility or an electrician bridge the line and load terminals so the meter can be pulled and changed without dropping power to the building. Many utilities require bypass on any socket serving a tenant or occupied dwelling. If your utility does not require bypass, a non-bypass socket is the simpler order; if they do, this MTB-100 covers it along with the 1-100 amp main breaker.

The socket uses single mechanical terminals, meaning set-screw lugs rather than compression connectors, with one conductor per terminal. If your service run is a parallel or double-tap arrangement, you need a dual-rated or multi-barrel terminal socket instead. Size your conductor to the breaker you are installing within the 1 to 100 amp range.

The enclosure is G90 galvanized steel with a powder coat finish, the standard outdoor service-entrance construction, and it mounts to the surface of the wall. G90 plus powder coat handles normal outdoor exposure; for heavy salt-spray coastal or wash-down environments, specify a stainless enclosure instead.

It ships with twin small closing plates rather than factory-threaded hubs. You knock out and fit your own hub or connector where the service raceway enters, which gives you a choice of top or bottom feed instead of being locked into a fixed hub position. Order the hub separately and size it to your service conduit.

60 hertz, which is standard North American utility power. It is not intended for 50 Hz service.

The internal insulating base is fiberglass with resin, which is the standard dielectric barrier holding the jaw and terminal assembly in a service-entrance socket. It is what keeps the line and load terminals isolated from the galvanized steel can.