{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2VB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2VB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2VB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2VB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1122-2VB40 coupling relay, size S00, 24 VDC coil, 2 NO instantaneous contacts, 10 A AC-12, screw and snap-on mounting, IP20 front, with diode surge suppression.","salesMarkdown":"## SIRIUS coupling relay for auxiliary circuit switching The Siemens 3RH1122-2VB40 is a SIRIUS coupling relay designed for switching auxiliary circuits in control panels. The size S00 footprint (45 mm wide, 60 mm high, 73 mm deep) is the standard compact relay-contactor format for this class. ## Environmental and electrical ratings Operates from -25 to +60 °C and stores from -55 to +80 °C, with a maximum altitude of 2 000 m. Shock resistance is 10g / 5 ms and 5g / 10 ms, adequate for machine-mounted applications with moderate vibration. The contacts are rated for switching at multiple voltages: 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. The AC-12 rating at 10 A is the headline figure for resistive loads. The built-in diode surge suppressor across the coil means you don't need an external flyback diode for DC switching — just verify polarity matches the circuit. Terminals accept solid conductors from 0.25 to 2.5 mm², which covers standard control wiring up to 14 AWG. The screw terminals are straightforward for panel builders — no special tooling needed beyond a standard screwdriver.","metaTitle":"Siemens 3RH1122-2VB40 SIRIUS Coupling Relay, 24 VDC, 10 A","metaDescription":"Siemens SIRIUS 3RH1122-2VB40 coupling relay for switching auxiliary circuits. 24 VDC coil, 10 A AC-12, 2 NO contacts, size S00, screw and snap-on mounting, IP20 front, diode surge","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","Maximum":"2 000 m","At The Side":"0 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.85","Mounting type":"screw and snap-on mounting","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","Auxiliary switch":"No","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","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","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","Design of the surge suppressor":"with diode","Closing power of magnet coil at DC":"1.4 W","Holding power of magnet coil at DC":"1.4 W","Operating current at AC-12 maximum":"10 A","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 61346-2":"K","Reference code acc. to DIN EN 81346-2":"K","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 (0.25 ... 1.5 mm²)","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"Cage Clamp terminals","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","Number of NC contacts for auxiliary contacts":"2","Number of NO contacts for auxiliary contacts":"2","with degree of pollution 3 at AC rated value":"690 V","Type of voltage of the control supply voltage":"DC","Identification number and letter for switching elements":"22 E","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=320545&mlfb=3RH1122-2VB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2VB40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this coupling relay?","answer":"The 3RH1122-2VB40 has a 24 VDC coil, 2 NO instantaneous contacts rated 10 A at AC-12, with a mechanical life of 30 million operations. It operates from -25 to +60 °C and mounts on DIN rail with zero side clearance."},{"question":"What is the depth of this component?","answer":"The depth is 73 mm."},{"question":"What wire size does the terminal accept?","answer":"It accepts solid conductors from 0.25 to 2.5 mm²."},{"question":"Does this relay include surge suppression?","answer":"Yes, it includes a built-in diode surge suppressor across the coil."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2VB40","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/3RH1122-2VB40 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}}