{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1BN40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1BN40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1BN40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BN40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH2122-1BN40, Size S00, 4 W DC magnet coil, screw and snap-on 35 mm DIN rail mounting, 2 NO + 2 NC contacts.","salesMarkdown":"## Switching capability — what the DC ratings actually mean This contactor carries a full set of DC switching ratings across common control voltages: 10 A at 24 V DC, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.26 A at 600 V. These are not continuous carry currents — they're the make/break ratings for resistive DC loads. If you're switching solenoid valves or DC motor brakes at 24 V, the 10 A rating gives you headroom for a typical 2-3 A holding coil; at 110 V the 3 A limit means a single large contactor coil is fine, but paralleling multiple loads needs a check. That's fast enough for a pick-and-place cycle or a high-speed packaging line interlock. That 6 mm side gap is tighter than some contactors; if you're packing them side-by-side on the rail, you can run them at the minimum without derating for heat dissipation from the coil, as long as ambient stays under 60 °C. Terminals accept 2 x (0.5 to 1.5 mm²), 2 x (0.75 to 2.5 mm²), or 2 x 4 mm² solid or stranded — spring-cage or screw terminals depending on variant.","metaTitle":"Siemens 3RH2122-1BN40 SIRIUS Auxiliary Contactor, 4W DC Coil","metaDescription":"Siemens 3RH2122-1BN40 SIRIUS auxiliary contactor, Size S00, 4W DC coil, screw and snap-on 35mm DIN rail mounting. Rated for 10A at 24V DC. Current lifecycle stage, available to ord","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":"250 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":"$24.13","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=190206&mlfb=3RH2122-1BN40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BN40/alternatives.json"},"ai":{"faq":[{"question":"What are the key DC switching ratings for the 3RH2122-1BN40?","answer":"At 24 V DC it's rated for 10 A, at 60 V for 4.7 A, at 110 V for 3 A, at 220 V for 1.2 A, and at 600 V for 0.26 A — these are resistive load make/break ratings, not continuous carry."},{"question":"Where can I buy the 3RH2122-1BN40 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 — no stock figures or price lists are published here."},{"question":"Will the 3RH2122-1BN40 drop into a panel built for the 3RH2122-1BW40?","answer":"Both are Size S00 auxiliary contactors on the same 35 mm DIN-rail footprint with identical dimensions (45 x 57.5 x 73 mm) and the same clearance requirements. The difference is the coil voltage — the -1BN40 uses a DC coil; the -1BW40 uses an AC coil. If the control circuit is DC, the -1BN40 drops in without rewiring the mounting or terminals, but the coil supply must match."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1BN40","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/3RH2122-1BN40 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}}