The Siemens 3RB1246-1EA70-ZW98 is a 3-phase straight-through transformer with a 15 mm diameter bore and 30 cm connection slots.
What the description means for fit
Straight-through (bar-type) design means the primary conductor passes through the 15 mm bore — no primary winding to terminate. The 30 cm connection slots give you pigtail leads for secondary wiring back to the overload relay or metering input. Panel builders: the through-bore accepts a busbar or cable up to roughly 15 mm diameter; plan gland-plate clearance for the flying leads.
This transformer is in Siemens' active range with a current lifecycle stage.