{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2BF40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-2BF40 auxiliary contactor, size S00, 2 instantaneous contacts, 110 V DC coil, screw and snap-on 35 mm DIN rail mounting, 45 mm width, 73 mm depth.","salesMarkdown":"## Panel fit for the S00 frame The 3RH2122-2BF40: At 45 mm wide and 73 mm deep, this S00-frame auxiliary contactor occupies a single 45 mm DIN-rail slot — no more, no less. Mounting is screw-and-snap onto standard 35 mm rail. ## Contact ratings across the voltage range The 2 instantaneous contacts carry rated operational currents that drop as voltage rises. At 24 V DC the contacts are rated 10 A; at 110 V DC it's 3 A; at 600 V DC the rating falls to 0.26 A. The AC switching rate is 10 000 operations per hour, which sets the maximum cycling frequency for applications like rapid reversing or jogging. Mechanical service life is 30 000 000 operations typical — this is the wear-out limit of the mechanism, not the contacts under load. Actual electrical life depends on the switched current and voltage; for high-current DC switching expect far fewer cycles. Closing power and holding power are both 4 W at DC, meaning the coil draws about 36 mA steady-state at 110 V. The minimum relative humidity is 10 % — this matters for dry-climate installations where static discharge risk is higher. The substance prohibitance date of 10/01/2009 marks RoHS compliance — the contactor contains no restricted substances above the threshold as of that date.","metaTitle":"Siemens 3RH2122-2BF40 SIRIUS Auxiliary Contactor, S00","metaDescription":"Siemens 3RH2122-2BF40 SIRIUS auxiliary contactor, size S00, 45 mm wide, 2 instantaneous contacts, 110 V DC coil, screw and snap-on 35 mm DIN rail mounting.","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","title":"3RH2122-2BF40","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"110 V","description":"Contactor relay, 2 NO + 2 NC, 110 V DC, Size S00, Spring-type terminal","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 ... 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 ... 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 ... 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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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":"spring-loaded 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/392f28e2fa948763ec8613113f0307d9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=290851&mlfb=3RH2122-2BF40"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2BF40","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/3RH2122-2BF40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}