{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1BM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1BM40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1BM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH2122-1BM40, 2 NO instantaneous contacts, 4 W DC coil, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## SIRIUS auxiliary contactor for signal switching and control logic Its 2 NO instantaneous contacts handle rated operational currents from 10 A at 24 V and 230 V AC down to 0.26 A at 600 V AC, covering the voltage range typical of 24 VDC control buses and 230/400 VAC line-level signaling. The DC coil draws 4 W on pick-up and 4 W holding, a steady-state load that a 24 VDC power supply or PLC output card must budget for per contactor. The switching capacity table tells the real story: at 24 V rated value the contacts carry 10 A, at 230 V rated value also 10 A, but at 440 V rated value that drops to 0.5 A and at 600 V rated value to 0.26 A. This derating follows the arc-quenching limits of the S00 air gap — for a 480 V control circuit, verify the load current against the 440 V column. The mechanical life of 30,000,000 cycles is the theoretical limit; electrical life will be lower and depends on the switched load, but the figure confirms the contactor is rated for high-cycle applications like pick-and-place or packaging lines. The S00 footprint — 45 mm wide, 57.5 mm tall, 73 mm deep — fits standard 45 mm slot spacing. Terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded copper. The product extension auxiliary switch is available, meaning additional contact blocks can be ganged onto this base unit without replacing the coil assembly.","metaTitle":"Siemens 3RH2122-1BM40 SIRIUS Auxiliary Contactor, 2 NO, S00,","metaDescription":"Siemens 3RH2122-1BM40 SIRIUS auxiliary contactor, size S00, 2 NO instantaneous contacts, 4 W DC coil, screw and snap-on DIN rail mounting. Rated switching capacity up to 10 A at 23","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":"220 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 DIN 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":"$21.59 – $63.70","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=137547&mlfb=3RH2122-1BM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BM40/alternatives.json"},"ai":{"faq":[{"question":"What are the key switching ratings for 3RH2122-1BM40?","answer":"The 2 NO contacts are rated 10 A at 24 V AC/DC and 230 V AC, derating to 0.5 A at 440 V AC and 0.26 A at 600 V AC. Mechanical life is 30,000,000 cycles."},{"question":"Will 3RH2122-1BM40 drop into a panel specified around 3RH2122-1BP40?","answer":"Yes — both are S00 size auxiliary contactors on the same 45 mm DIN-rail footprint with identical mounting dimensions (45 mm width, 57.5 mm height, 73 mm depth) and clearance requirements. The difference is the contact configuration: 3RH2122-1BM40 has 2 NO contacts; 3RH2122-1BP40 has a different NO/NC arrangement. Verify your circuit's contact count before substituting."},{"question":"Where can I buy 3RH2122-1BM40?","answer":"This part is sourced and quoted to order through independent industrial distribution. Availability and current pricing are confirmed at quote time against an RFQ — submit one through this listing for a firm commercial response."},{"question":"What compliance documentation does Siemens provide for 3RH2122-1BM40?","answer":"The part carries substance prohibitance date of 10/01/2009, indicating RoHS compliance per EU Directive 2002/95/EC. Siemens typically provides CE, UKCA, and UL/CSA declarations for the SIRIUS contactor family; request the specific declaration of conformity with your order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1BM40","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/3RH2122-1BM40 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}}