What the 4 NO contacts and 10 A rating mean for your control circuit
The 3RH2344-1AP00-0KA0 is a SIRIUS auxiliary contactor with four normally-open instantaneous contacts, meaning it switches four separate control circuits simultaneously without any built-in delay. For a 24 VDC PLC output or relay interposing circuit, those four NO poles give you plenty of isolation between signals without needing a separate terminal block. The contactor is rated for 10 million mechanical operations typical, so in a machine that cycles once per minute you are looking at roughly 19 years of service before the mechanism wears out. The arcing time sits between 10 and 15 ms, which is standard for this class of auxiliary contactor and means the downstream PLC input filter needs to be set longer than that to catch a clean signal.
Panel fit and DIN rail mounting — size S00 footprint
That means you can pack these side-by-side on the rail with just a finger's width between them, which matters when you are squeezing a dozen auxiliary contactors into a small sub-panel.
Lifecycle and sourcing — still in current production
That means you can spec it into a new BOM without worrying about a last-time-buy window closing. For volume purchases or project quotes, this part is sourced through authorized distribution channels and quoted to order against your BOM quantity; lead time and pricing are confirmed at RFQ time.