{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1WB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1WB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1WB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1WB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH1122-1WB40, 24 V DC coil, 10 A rated current, 2 NO + 0 NC contacts, varistor suppression, screw and snap-on mounting, size S00.","salesMarkdown":"The Siemens SIRIUS 3RH1122-1WB40 is a coupling relay for switching auxiliary circuits — the kind of part that sits between a PLC output or pushbutton and the coil of a larger contactor, or that drives signal lamps, solenoid valves, and interlock loops in a control panel. It is not a motor-load contactor; its job is signal-level switching in the auxiliary circuit, not main power. The coil is rated 24 V DC with a pick-up threshold of 0.85 x rated value and a drop-out of 0.1 x rated value, and it draws a steady 1.4 W holding power — a fixed DC magnet, so no AC hum and no inrush spike beyond the initial pull-in. The built-in varistor across the coil suppresses the inductive kickback, which matters when a PLC or safety relay drives it: without that suppression the back-EMF can couple noise into the 24 V bus or damage the output driver. Contacts are 2 NO instantaneous (no delayed, lagging, or make-before-break variants), rated 10 A at 24 V, 6 A at 230 V, and derating to 1 A at 690 V. ## Mounting and wiring in the panel Size S00 footprint — 45 mm wide, 57.5 mm tall, 72 mm deep — and the fastening method is screw or snap-on onto a DIN rail. Terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², and 2x 4 mm². The dual-wire entry per clamp is useful for daisy-chaining the common rail without extra terminals — a time-saver on repetitive auxiliary circuits.","metaTitle":"Siemens 3RH1122-1WB40 SIRIUS Coupling Relay, 24 V DC Coil","metaDescription":"Siemens SIRIUS 3RH1122-1WB40 coupling relay for auxiliary circuits. 24 V DC coil, 10 A rated current, varistor suppression. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","Height":"57.5 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)":"01.07.2006 00:00:00","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","reference code acc. to IEC 81346-2":"K","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","with low demand rate acc. to SN 31920":"40 %","with high demand rate acc. to SN 31920":"75 %","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)","Touch Protection Against Electrical Shock":"finger-safe","Of Auxiliary Contacts Instantaneous Contact":"0","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","B10 value with high demand rate acc. to SN 31920":"1 000 000; With 0.3 x Ie","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":"screw-type 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":"$179.48","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=112311&mlfb=3RH1122-1WB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1WB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1122-1WB40?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Submit a request for quotation to confirm current availability and pricing for your volume."},{"question":"Does 3RH1122-1WB40 have a varistor?","answer":"Yes — the surge suppressor design is a varistor built across the coil. It absorbs the inductive kickback when the coil de-energizes, protecting the driving circuit from voltage spikes."},{"question":"What are the specifications of 3RH1122-1WB40?","answer":"Siemens SIRIUS coupling relay, size S00, 2 NO instantaneous contacts, 24 V DC coil with varistor suppression. Rated 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. Screw and snap-on DIN-rail mounting, IP20 front. Operating temperature -25 to +60 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1WB40","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/3RH1122-1WB40 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}}