{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 110 V AC coil, 2 NO + 2 NC instantaneous contacts, screw and snap-on 35 mm DIN rail mounting, 73 x 45 x 57.5 mm.","salesMarkdown":"It carries 2 NO and 2 NC instantaneous contacts, rated for a 110 V AC coil. At 24 V AC the contacts handle 10 A resistive; at 110 V AC they switch 3 A, and at 230 V AC they hold 10 A — the 110 V AC rating is the one that governs the coil circuit, while the 230 V AC figure covers the load side for common line voltages. Mounts via screw fixing or snap-on onto 35 mm DIN rail — the S00 frame width is 45 mm, depth 73 mm, height 57.5 mm. That keeps the panel footprint tight; you can fit several side by side on a standard rail section. The lifecycle status is current production; it's a standard catalog item from the SIRIUS line, not a phase-out or NRND part. RoHS compliance date is October 1, 2009, covering the EU substance prohibitions. ## Wiring and Contact Ratings Terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded wire — spring-cage or screw terminals are typical for this series, though the evidence specifies screw and snap-on mounting. The instantaneous contacts are rated for 10 A at 24 V AC and 230 V AC, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and derated at higher voltages: 0.5 A at 440 V, 0.26 A at 600 V, 1 A at 690 V.","metaTitle":"Siemens 3RH2122-1BF40 SIRIUS Auxiliary Contactor, 110 V Coil","metaDescription":"Siemens 3RH2122-1BF40 SIRIUS auxiliary contactor, size S00, 110 V AC coil, 2 NO+2 NC contacts. Screw and snap-on DIN rail mount. Current production, sourced to order. Depth 73 mm,","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":"110 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","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/86401a9bce2bf8b9482a9d61607da295.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=524037&mlfb=3RH2122-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BF40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH2122-1BF40?","answer":"The 3RH2122-1AC60 is a functional peer — same S00 frame, same 2 NO + 2 NC contact configuration, but with a 60 Hz coil instead of 110 V AC. The 3RH2131-1AH00 adds a third NO contact (3 NO + 1 NC) and uses a 110 V DC coil. The 3RT6017-1AF01 is a power contactor, not an auxiliary, so it's a different class. For a drop-in replacement with the same coil voltage, stick with the -1BF40 variant."},{"question":"Where can I buy 3RH2122-1BF40 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for volume or single-unit pricing."},{"question":"What compliance documentation does Siemens provide for 3RH2122-1BF40?","answer":"RoHS compliance is confirmed with a substance prohibition date of October 1, 2009. The product carries pollution degree 3 rating and is designed to meet IEC/EN standards for industrial control equipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1BF40","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/3RH2122-1BF40 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}}