The Siemens 3RA1220-0HB23-0BW4 is a reversing combination starter in the SIRIUS family, frame size S0, rated for 0.55-0.8 A with a 24 VAC control voltage. The 0.55-0.8 A current range sizes it for small reversing motor loads — think a conveyor direction change or a pump valve actuator. The 24 VAC control coil keeps it in the safe low-voltage zone for control circuits.
The 0.55-0.8 A rating is the motor full-load current the starter can handle in reversing duty. UL file E156943 in Volume 1, Section 14 means this starter is UL listed for the US market — it passed UL 508A for industrial control panels. That file number is what your electrical inspector or plant safety team will look for on a UL label.
Deployment context
In a panel, it replaces three separate components and the wiring between them. On a line-down repair, that means fewer parts to carry in the van and less time swapping.
The lifecycle stage is listed as current, meaning Siemens still produces this order code.