Milbank MTB-200 4-7 Terminal Ring-Type Small Closing Plate Link Bypass 1-200 Ampere Main Breaker

Terminal count is set by the service the utility is feeding you, not by preference. The Milbank MTB-200 is built both ways: the 4-terminal version (224MTB in the 48 inch height, U224MTB in the 30 inch height) is the standard single-phase 3-wire 120/240V socket, and the 7-terminal version (227MTB, U227MTB) is the arrangement utilities call for on network single-phase 120/208V services where the meter needs the extra current-transformer and neutral connections. Pull the utility's meter-base specification for the address before ordering; they dictate the terminal count and will not set a meter on the wrong one.

Both heights are made. The MTB-200 comes in a 48 inch enclosure (224MTB with 4 terminals, 227MTB with 7) and a shorter 30 inch enclosure (U224MTB and U227MTB). The 30 inch versions are the ones to order when you are working around a window, a porch roof, a gas meter, or a wall run that will not take the full-height can while still holding the meter center in the utility's required window. Terminal count is independent of height, so you can get either terminal arrangement in either size.

Ring-type means the meter is held to the socket by a sealing ring that clamps around the rim of the meter and the socket hub, and the utility puts its seal on that ring. The alternative is a ringless socket, where a removable cover goes over the meter and gets sealed instead. Utilities are specific about which one they will set a meter on, and it varies by territory and sometimes by the age of the service. The MTB-200 is the ring-type build, so confirm your serving utility's meter-base spec calls for ring-type before you set the can in the wall. Ordering the wrong style is the most common reason a new service fails its meter set.

Link bypass gives the utility a way to carry the load around the meter while the meter is pulled, using bypass links behind the terminals instead of a lever or horn bypass that can be thrown without opening the can. The MTB-200 is the link bypass build. It is the arrangement many utilities require on commercial and multi-family services so a meter can be changed or tested without dropping power to the tenant. Which bypass style is acceptable is a utility call, same as the terminal count, so check their meter-base spec sheet before committing to link bypass over a lever bypass socket.

Yes. The MTB-200 keeps the same terminal arrangement across both enclosure heights, so a property with mixed wall conditions can run 48 inch cans (224MTB or 227MTB) where there is room and 30 inch cans (U224MTB or U227MTB) at the tight locations while every position keeps the same ring-type, link bypass meter interface. That matters for a maintenance crew, because the sealing rings, the bypass procedure, and the meter itself stay common across the whole site.