{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1BF40-0AA6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1BF40-0AA6","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1BF40-0AA6","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BF40-0AA6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH2122-1BF40-0AA6, 110 V DC coil, 2 NO contacts, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"It carries 2 NO instantaneous contacts and is driven by a 110 V DC coil that draws 4 W during both pick-up and hold. That constant-power coil design means the control transformer doesn't see a current surge on closure; sizing the DC supply is straightforward. It belongs to the SIRIUS family and is built in the S00 frame size. The S00 footprint is the smallest in the SIRIUS contactor range — 45 mm wide, 57.5 mm tall, 73 mm deep — which keeps the DIN-rail fill factor tight when you're stacking multiple auxiliaries next to a main contactor. ## Switching capability — what the DC ratings actually mean The 110 V DC coil is the identity of this variant. The contact ratings are tabulated by voltage: at 24 V it switches 10 A, at 60 V it's 4.7 A, at 110 V it's 3 A, at 220 V it's 1.2 A, and at 600 V it drops to 0.26 A. These are DC-13 (solenoid/brake) load ratings — the current falls as voltage rises because DC arcs are harder to extinguish. If you're switching an inductive DC load like a brake coil or a solenoid valve, use the voltage row that matches your circuit; don't interpolate between rows. AC ratings are also present: 10 A at 230 V, 3 A at 400 V, 1 A at 690 V. For a signal-level auxiliary contactor those numbers are typical — the contacts are silver-alloy, sized for control-circuit duty, not motor inrush. ## Clearance and environment That's the spacing needed to avoid heat buildup and arc flashover between auxiliaries packed on the same rail. Relative humidity minimum is 10 % — the contactor is not damaged by dry conditions. The substance prohibition date of 10/01/2009 aligns with RoHS compliance; the part is RoHS-compliant and REACH-registered as standard for SIRIUS products.","metaTitle":"Siemens 3RH2122-1BF40-0AA6 SIRIUS Auxiliary Contactor, 110 V","metaDescription":"Siemens SIRIUS 3RH2122-1BF40-0AA6 auxiliary contactor, size S00, 110 V DC coil, 2 NO contacts. Screw and snap-on mounting. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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 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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=179654&mlfb=3RH2122-1BF40-0AA6","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BF40-0AA6/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2122-1BF40-0AA6 drop into a panel specified around 3RH2122-1BW40 without rewiring?","answer":"The 3RH2122-1BF40-0AA6 uses a 110 V DC coil; the 3RH2122-1BW40 uses a different coil voltage. The mechanical footprint (S00, 45 mm wide, snap-on rail mount) is identical, but the coil circuit must match your control voltage. If your panel was wired for 110 V DC, this is a direct swap. If the original spec called for a different coil voltage, you need the corresponding variant."},{"question":"What compliance documentation does this brand provide for 3RH2122-1BF40-0AA6?","answer":"Siemens provides RoHS and REACH declarations as standard for SIRIUS products. The substance prohibition date of 10/01/2009 confirms RoHS compliance. UL and IEC certifications are available in the manufacturer's declaration package upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1BF40-0AA6","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/3RH2122-1BF40-0AA6 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}}