Siemens 3RA2933-2BB2 — SIRIUS electrical and mechanical wiring kit, including mechanical interlocking, for a star-delta (wye-delta) contactor assembly in size S2. Spring-loaded terminal connection. The screw terminal equivalent is 3RA2933-2BB1; for a reversing starter assembly of the same size see 3RA2933-2AA1 and 3RA2933-2AA2.