Milbank U5059-X 4-5 Terminal Ringless Meter Socket - Large Closing Plate with Main Breaker and Locking Connector Options

For one 200 amp main, order the U5059-X-1/200, which is the 4 terminal version with a single 1-200 ampere main breaker. If you want the 200 amp main plus the locking mechanical connector, the U5059-X-2/200-K3L carries two 200 ampere mains with a single connector rated 4 to 600 kcmil. Order the socket that matches what the serving utility has approved for the meter position, since the terminal count and breaker arrangement are what they inspect.

K3L on the U5059-X is the single locking mechanical connector rated for conductors from #4 through 600 kcmil. It appears on the 2-150 ampere version (U5059-X-2/150-K3L), the 2-200 ampere version (U5059-X-2/200-K3L), the 5th terminal 9 o'clock version (U5059-X-5T9-K3L) and the breaker provision only version (U5059-X-K3L). If your service conductors fall anywhere in the 4 to 600 kcmil range, the K3L connector lands them without an adapter lug.

Yes, on any of the K3L versions. That connector is rated 4 through 600 kcmil, so 4/0 and 350 kcmil both sit inside the range with room on either side. It is a single connector per position, so one conductor per terminal, not parallel runs.

Two of them. The U5059-X-5T9-K3L places the 5th terminal in the 9 o'clock position and comes with the locking 4 to 600 kcmil connector. The U5059-X-2/200-K3L-5T6-AMS is the Ameren 5 terminal build with two 200 ampere breakers and lever bypass. Terminal position matters to the utility, so match the clock position their standard calls for rather than treating 4 and 5 terminal sockets as interchangeable.

Yes. The U5059-X-K3L is the 4 terminal socket with 2-main breaker provision and the single locking 4 to 600 kcmil connector, meaning the breaker positions are provided but the breakers are not supplied with it. The U5059-X-K3L-ALT is the same dual main breaker provision in the Alliant Energy build. If you want the breakers factory installed instead, the -1/200, -2/150 and -2/200 versions come with mains.

Lever bypass is called out on the U5059-X-2/200, the 4 terminal version with two 200 ampere mains, and on the Ameren 5 terminal build U5059-X-2/200-K3L-5T6-AMS. Bypass lets the utility pull the meter without dropping the load, and many utilities require it on 200 ampere and larger positions. The non-bypass builds such as the U5059-X-1/200 do not have it, so check the utility standard before substituting one for the other.

The U5059-X-2/200-K3L-IL carries two 200 ampere mains, the single 4 to 600 kcmil locking connector, and 7/16 inch knockouts with a lock provision. That is the build to specify where the utility or the property owner wants the enclosure padlocked rather than only sealed, which comes up on multi-family and commercial sites with exposed meter banks.