{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2WB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2WB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2WB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2WB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH1122-2WB40, for switching auxiliary circuits, 24 V DC coil, 10 A rated current, size S00, screw and snap-on mounting, IP20 front.","salesMarkdown":"The Siemens 3RH1122-2WB40 is a SIRIUS coupling relay, size S00, designed to switch auxiliary circuits in control panels. ## Switching capability and contact reliability Two instantaneous contacts (NO/NC configurable per the wiring diagram) handle the auxiliary switching. The relay is rated for 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V — derate as voltage climbs. ## Environmental and electrical robustness IP20 on the front keeps fingers and tools out — standard for panel-mount gear. The coil draws 1.4 W closing and holding (DC), so no thermal derating headache in a dense row. Shock tested to 10g / 5 ms and 5g / 10 ms, and operating temperature spans -25 to +60 °C. The built-in varistor surge suppressor (across the coil) means you don't need an external flyback diode for DC switching, which simplifies BOM and panel wiring. RoHS compliance date is July 1, 2006, and the part carries Siemens SIRIUS branding with full traceability through the authorized channel.","metaTitle":"Siemens 3RH1122-2WB40 SIRIUS Coupling Relay, 24 V DC, 10 A,","metaDescription":"Siemens 3RH1122-2WB40 SIRIUS coupling relay for switching auxiliary circuits. Rated 24 V DC, 10 A. Screw and snap-on mounting. IP20 front. Quoted to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"24 V","Initial Value":"0.85","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.85","Shock Resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","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","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","Degree Of Pollution":"3","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"10 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"2 A","at 690 V rated value":"1 A","Instantaneous Contact":"2","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"1.4 W","holding power of magnet coil at DC":"1.4 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","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","Identification Number And Letter For Switching Elements":"22 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Type Of Electrical Connection For Auxiliary And Control Circuit":"Cage Clamp terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"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=42269&mlfb=3RH1122-2WB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2WB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RH1122-2WB40?","answer":"The 3RH2122-1WB40 is a peer in the same SIRIUS coupling-relay family, but it uses a different coil voltage (not 24 V DC) and has a different contact arrangement — verify the coil and contact configuration before substituting. The 3RH1122-2WB40 is the 24 V DC variant with a built-in varistor."},{"question":"Will 3RH1122-2WB40 drop into a panel specified around 3RH2122-1WB40 without rewiring?","answer":"The mounting footprint and terminal layout are the same SIRIUS S00 size, so it physically fits the same DIN-rail position. However, the coil voltage and contact configuration differ — check the 24 V DC coil and the 2-contact arrangement against the original spec before committing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2WB40","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/3RH1122-2WB40 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}}