Reversing starter, S0 frame, current production
The Siemens 3RA2220-1AB23-0BB4 is a SIRIUS non-fused reversing motor starter in the Size S0 load-feeder format. It combines a contactor pair, a thermal bimetallic overload relay (Class 10), and a magnetic short-circuit trip in one package — meaning you get forward/reverse control and motor protection without wiring separate components. This is a current-production part, so you're not hunting surplus or a cross-reference.
Duty ratings and what they mean for the panel
That's the motor-switching capability — the contactor pair handles reversing duty, so the full load current at 400 V is about 1.6 A, and at 600 V about 1.3 A. The supplied contactor is a 3RT2023-1BB40, the link module is 3RA2921-1BA00, and the busbar adapter is 3RA2922-1AA00. The circuit-breaker size is S00, so the whole assembly fits a compact footprint: 90 mm wide, 130 mm deep, 265 mm tall. Clearance requirements: 30 mm above, 10 mm in front, 10 mm below, 9 mm at the sides.
Snap-on DIN rail, vertical mount, pollution degree 3
Pollution degree 3 means it's rated for industrial environments where conductive dust or occasional condensation can occur — no need for an additional enclosure in a typical panel. The 24 V coil is standard for control circuits in most industrial panels.