The Siemens 3RT2028-1AV60 is a SIRIUS power contactor in size S0, rated for 34 A at 480 V in AC-3 duty — the motor-switching curve that governs most induction-motor starts and stops in industrial panels.
The 34 A at 480 V AC-3 rating is the headline number — it tells you this contactor can handle a 480 V motor load drawing up to 34 A under the switching duty of starting and stopping (AC-3). That is the rating that decides whether it fits your motor branch circuit. The auxiliary switch is included (yes), so you get a built-in N.O./N.C. set for status feedback or interlocking without adding a separate block. Mechanical life is typical 10 million operations, and the maximum switching frequency varies by duty: 1000 cycles/hour at AC-1 (resistive), 750 at AC-2 and AC-3, and 250 at AC-4 (plugging/inching). That last one is the limiting factor for high-wear applications.
For a BOM line that calls out 3RT2028-1AV60, the fit is confirmed by the 34 A at 480 V AC-3 rating and the S0 frame size. This is a quoted-to-order part; we source it against an RFQ.