This is the active catalog number for the Siemens SIRIUS S3 power contactor family, so it ships against a standard RFQ without the premium or lead-time risk of an obsolete part. The S3 frame (size S3) is the current-generation mechanical platform; no successor has been issued because none is needed.
This is a power contactor rated for motor switching duty. For across-the-line squirrel-cage motors (AC-3), the same contactor handles 45 kW at 500 V and 21.1 kW at 690 V, so the real-world fit depends on your motor nameplate voltage and duty cycle. The AC-4 rating of 66 A at 400 V covers reversing, plugging, and inching applications where the contactor interrupts full locked-rotor current.
The S3 footprint is 70 mm wide, 146 mm tall, 139 mm deep, so it occupies a standard four-module width on a 35 mm rail. Main circuit wiring uses screw-type terminals. The stranded wire range goes up to 2x 50 mm², which is generous for a contactor this size — it can take a 1/0 AWG equivalent for high-current feeds.
The substance prohibitance date is 05/01/2012, which aligns with the original EU RoHS directive scope. This means the contactor is RoHS-compliant for the standard six substances.