{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH2122-1BD40, 2 NO + 2 NC contacts, 24 V DC coil 4 W, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"It carries 2 normally-open and 2 normally-closed instantaneous contacts, rated for 10 A at 24 V AC and 10 A at 230 V AC, with derated curves at higher voltages (4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V, and 0.5 A at 440 V, 0.26 A at 600 V). The DC coil draws 4 W for both pick-up and hold, so there is no inrush spike to size a power supply around — the supply sees a steady 4 W load the whole time the contactor is energized. The S00 body measures 45 mm wide by 57.5 mm tall by 73 mm deep — that 73 mm depth is the dimension that sticks out from the DIN rail, so check your enclosure depth clearance before committing the BOM. Screw terminals accept 2 × (0.5 to 1.5 mm²) solid or stranded, 2 × (0.75 to 2.5 mm²), or 2 × 4 mm².","metaTitle":"Siemens 3RH2122-1BD40 SIRIUS Auxiliary Contactor, 4W DC Coil","metaDescription":"Siemens 3RH2122-1BD40 SIRIUS S00 auxiliary contactor, 2 NO+2 NC contacts, 24V DC coil 4W. Current production. Screw/snap-on 35mm DIN rail. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"42 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Full-Scale Value":"1.1","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"2","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"4 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"22 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c100e7d576663b4b2ebbbc1e4cf05ed9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=453624&mlfb=3RH2122-1BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BD40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2122-1BD40 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RH2122-1BD40 drop into a panel that was specified around 3RH2122-1BW40 without rewiring?","answer":"Both are SIRIUS S00 auxiliary contactors with the same 45 mm width and 35 mm DIN-rail mounting, so the mechanical fit is identical. The difference is the coil: the 1BD40 has a 24 V DC coil (4 W), while the 1BW40 uses a different coil voltage. If the panel's control voltage matches 24 V DC, it drops in without rewiring; if the original spec called for a different coil voltage, the 1BD40 won't pull in."},{"question":"What compliance documentation does this brand provide for 3RH2122-1BD40 (RoHS, REACH, UL, IEC)?","answer":"The part carries a substance prohibition date of 10/01/2009, indicating RoHS compliance. The degree of pollution is rated 3, per IEC 60947-1. For specific UL, CSA, or other agency file numbers, the manufacturer's documentation should be referenced at order time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1BD40","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RH2122-1BD40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}