{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2QB40-0LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2QB40-0LA0","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2QB40-0LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2QB40-0LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1122-2QB40-0LA0, 24 V DC coil, 10 A rated current at 24 V, size S00, IP20 front, screw and snap-on mounting, 73 x 45 x 60 mm.","salesMarkdown":"## SIRIUS auxiliary contactor, 24 V DC, 10 A — what fits and what doesn't The Siemens 3RH1122-2QB40-0LA0 is a SIRIUS auxiliary contactor in size S00, designed for 24 V DC coil operation with a rated current of 10 A at 24 V. It carries 2 normally open instantaneous contacts and no delayed or lagging switching — straight make/break for auxiliary circuits in motor starters, contactor banks, or PLC output isolation. The coil draws 11 W on pick-up and holds at 4 W, so the control transformer or DC supply needs to handle that inrush without droop. RoHS compliance is documented with a substance prohibition date of 07/01/2006, covering the EU directive. The surge suppressor design uses diode assemblies, which means polarity matters on the DC coil — verify orientation before wiring. ## Ratings that govern the real application The 10 A rating at 24 V is the headline figure, but the contactor also carries switching capacities across higher voltages: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. That covers most control-voltage standards in a mixed-voltage panel — just watch the derating curve above 40 °C ambient (operating range -40 to +70 °C). Shock resistance is 10g at 5 ms and 5g at 10 ms — enough for machine-mounted applications on conveyors or presses, but not rated for continuous high-G environments like engine test cells. The screw terminals accept 2x (0.25 to 2.5 mm²) solid or stranded wire. That's standard for control wiring up to 14 AWG; fine-stranded wire should use ferrules to avoid strand breakout under the screw head. That leaves clearance for wiring ducts and adjacent devices. That flexibility helps in tight retrofit panels where the rail orientation isn't perfectly plumb. The product extension auxiliary switch is available as an add-on, so you can stack additional contact blocks on the side without changing the base unit.","metaTitle":"Siemens 3RH1122-2QB40-0LA0 SIRIUS Auxiliary Contactor, 24 V","metaDescription":"Siemens SIRIUS 3RH1122-2QB40-0LA0 auxiliary contactor, 24 V DC coil, 10 A rated current, size S00, IP20 front, screw/snap-on mount. Current production. Sourced to order against 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":"0.7","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.25","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":"Auxiliary contactor","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 diode assemblies","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"11 W","holding power of magnet coil at DC":"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":"1","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"21 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","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"}},"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=316217&mlfb=3RH1122-2QB40-0LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2QB40-0LA0/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this brand provide for 3RH1122-2QB40-0LA0?","answer":"RoHS compliance is documented with a substance prohibition date of 07/01/2006. The part carries IP20 front protection and surge voltage resistance of 6 kV. For full declarations (UL, CE, IEC), the manufacturer provides certificates on request."},{"question":"What is the depth of 3RH1122-2QB40-0LA0?","answer":"The depth is 73 mm, with a width of 45 mm and height of 60 mm. That's a size S00 footprint fitting standard DIN-rail enclosures."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2QB40-0LA0","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/3RH1122-2QB40-0LA0 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}}