Reversing starter, 2.5 A AC-3, IP55 — SIRIUS 3RK4340-3GR51-1BA0
It is rated 2.5 A at 400 V in AC-3 duty (switching motor loads up to that current) and carries a Class 10 trip curve — the bimetal protection responds fast enough for standard induction motors without nuisance tripping on startup inrush. Operating voltage is 340 to 440 V AC at 50/60 Hz, with a control supply of 20.4 to 26.4 V DC. The unit has no digital inputs onboard and no fieldbus communication (PROFINET, PROFIBUS, AS-Interface all absent) — it is an I/O-controlled standalone reversing starter, intended for direct wiring from a PLC or control relay.
Mounting and dimensions — fits standard enclosure layouts
Dimensions are 182 mm wide, 220 mm high, and 145 mm deep. The IP55 rating means the enclosure is dust-protected and resists water jets — suitable for washdown areas or outdoor cabinets where hose-down cleaning is routine. The design includes short-circuit protection via circuit breakers.
Lifecycle and sourcing — current production, quoted to order
No official successor or direct replacement is listed; the part remains an active catalog item. For BOM freeze or PCN watch, the substance prohibition date (RoHS compliance) is noted as May 1, 2012.