Siemens 3RH2353-1CH00-0KA0 — SIRIUS Auxiliary Contactor, Size S00
The Siemens 3RH2353-1CH00-0KA0 is a SIRIUS auxiliary contactor in the S00 frame size, carrying five normally open instantaneous contacts. It is rated for 10 A at 24 V, with a contact rating ladder that steps down through higher voltages: 4.7 A at 60 V, 3 A at 110 V and 400 V, and 1 A at 690 V. The DC switching capacity is specified at 10 000 operations per hour, and the arcing time sits between 10 and 15 ms.
Mounting and Panel Fit
Mounting is via screw fixing or snap-on onto a 35 mm standard mounting rail. The S00 footprint is compact: 57.5 mm high, 45 mm wide, and 117 mm deep. Clearance requirements are modest — 10 mm upwards, 10 mm forwards, 10 mm downwards, and just 6 mm at the side — so it packs tightly into a crowded enclosure. The mounting position allows ±180° rotation on a vertical surface and can be tilted forward or backward by ±22.5°, giving flexibility for odd panel layouts or retrofit into existing wireways.
Contact Ratings and Duty
The 3RH2353-1CH00-0KA0 provides five NO contacts rated for AC switching across the full voltage range: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. The DC ratings are lower, as expected — 0.5 A at 440 V and 0.26 A at 600 V — so for DC control circuits, verify the load against the specific voltage row. The mechanical life is 10 million operations typical, and the operating temperature span is -25 to +60 °C, with storage from -55 to +80 °C. Compared to the 3RH2362-2AF00, which carries a different contact arrangement (typically 3 NO + 2 NC or similar), this 5-NO variant is the right choice when you need all five poles to make on coil pickup — no break contacts to wire around. The S00 frame and DIN-rail footprint are identical, so a swap between the two requires no panel rework, just a check of the contact configuration against the schematic.
Compliance and Documentation
The 3RH2353-1CH00-0KA0 carries a RoHS compliance date of 07/01/2006, indicating it meets the original RoHS directive. The degree of pollution is rated 3, meaning it is suitable for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation. The brand provides standard Siemens SIRIUS documentation including a datasheet, operating instructions, and a CE declaration of conformity.