{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1VB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1VB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1VB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1VB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay for switching auxiliary circuits, 24 VDC coil, 10 A rated current, Size S00, screw and snap-on mounting, IP20 front.","salesMarkdown":"The Siemens 3RH1122-1VB40 is a SIRIUS coupling relay designed for switching auxiliary circuits — the control-side loads like contactor coils, indicator lamps, PLC inputs, and small solenoids that a main contactor or PLC output cannot drive directly. It is not a power contactor; it handles the logic-level and pilot-duty switching in a panel. Rated at 10 A in AC-12 duty (resistive load at 24 V rated value), it carries the typical auxiliary load curve. Pick-up voltage is 0.85 of rated (20.4 VDC), drop-out is 1.85 of rated (44.4 VDC). That wide drop-out margin means the relay stays pulled in through a sag down to about 20 V and only releases when the supply collapses or is positively switched off — useful on DC buses with weak regulation. The Size S00 footprint — 45 mm wide, 57.5 mm tall, 72 mm deep — fits the standard S00 slot in a Siemens motor starter assembly or as a standalone auxiliary relay on the rail. Terminals accept solid conductors: 2x 0.5…1.5 mm², 2x 0.75…2.5 mm², or 2x 4 mm². The built-in surge suppressor uses a diode across the coil. That means polarity matters on the DC coil supply — wire it backward and the diode forward-biases, shorting the supply. Mark the polarity on the terminal label during panel build. ## Switching capability and contact configuration Two instantaneous normally-open contacts (2 NO), no delayed, lagging, or make-before-break switching. Electrical life depends on the switched current and voltage; for auxiliary loads at rated values it will still see millions of cycles.","metaTitle":"Siemens 3RH1122-1VB40 SIRIUS Coupling Relay, 24 VDC, 10 A","metaDescription":"Siemens SIRIUS 3RH1122-1VB40 coupling relay for auxiliary circuits. 24 VDC coil, 10 A rated, Size S00, screw/snap-on mount. Current lifecycle stage. Sourced to order against RFQ.","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","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 Degree Of Pollution 3 Rated Value":"690 V","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)","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","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","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":"$32.32","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=145426&mlfb=3RH1122-1VB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1VB40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RH1122-1VB40?","answer":"The depth is 72 mm, with a width of 45 mm and height of 57.5 mm, fitting the standard Size S00 footprint."},{"question":"What wire sizes does 3RH1122-1VB40 accept?","answer":"The terminals accept solid conductors: 2x 0.5…1.5 mm², 2x 0.75…2.5 mm², or 2x 4 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1VB40","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/3RH1122-1VB40 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}}