{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary contactor, size S00, 3RH1122-1BG40, 125 V rated, 2 NO instantaneous contacts, 10 A at 24 V, IP20, screw and snap-on mounting.","salesMarkdown":"Rated 125 V with two normally-open instantaneous contacts, it carries 10 A at 24 V and derates to 1 A at 690 V. The 2 NO instantaneous contacts switch without delay — no leading or lagging action, no make-before-break overlap. That means the contacts close and open at the same instant the coil energizes or drops, which matters when you're using them for a safety feedback loop or a fast interlock where timing skew between contacts could cause a race condition. Mechanical life is 30 million cycles typical, so in a machine that cycles once per minute you get about 57 years of mechanical life before the springs fatigue. ## Wire termination and environment Terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² — that covers the common control-wire sizes from 20 AWG through 12 AWG.","metaTitle":"Siemens 3RH1122-1BG40 SIRIUS Auxiliary Contactor, 125V, 2 NO","metaDescription":"Siemens SIRIUS 3RH1122-1BG40 auxiliary contactor, size S00, 125V rated, 2 instantaneous NO contacts, 10A at 24V. IP20, screw/snap-on mount. Current production. Sourced to order.","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":"125 V","Initial Value":"0.8","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":"1.1","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)":"01.07.2006 00:00:00","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","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=536533&mlfb=3RH1122-1BG40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1BG40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RH1122-1BG40 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What is the closest functional second-source to the 3RH1122-1BG40?","answer":"The 3RH2122-1BW40 is a peer in the same SIRIUS size S00 family with 2 NO contacts, but it carries a different coil voltage rating — verify the 3RH2122-1BW40 coil matches your control voltage before substituting. The 3RH1122-1BG40 uses a 125 V rated coil; the 3RH2122-1BW40 uses a different coil voltage. Mechanical footprint and terminal layout are identical, so it drops into the same DIN-rail slot without rewiring the main power circuit, but the coil supply must be confirmed."},{"question":"What is the depth of the 3RH1122-1BG40?","answer":"The depth is 72 mm. Combined with the 45 mm width and 57.5 mm height, it occupies about 0.16 liters of panel volume — tight enough for high-density DIN-rail layouts."},{"question":"What wire sizes does the 3RH1122-1BG40 accept?","answer":"Solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm². That covers 20 AWG through 12 AWG control wiring. Ferruled stranded wires within the same cross-section ranges also fit."},{"question":"Will the 3RH1122-1BG40 drop into a panel specified around the 3RH2122-1BW40 without rewiring?","answer":"Yes, the mechanical footprint is identical — both are size S00 with the same 45 mm width, screw and snap-on mounting, and the same terminal layout. The main power and signal wires land in the same positions. The only difference is the coil voltage: the 3RH1122-1BG40 is rated 125 V; the 3RH2122-1BW40 uses a different coil voltage. If your control voltage is 125 V, the swap is wire-for-wire. If not, you need to change the coil supply."},{"question":"What compliance documentation does Siemens provide for the 3RH1122-1BG40?","answer":"The part carries RoHS compliance with a substance prohibition date of July 1, 2006. It is designed to meet IEC 60947-5-1 for control circuit devices and switching elements. The reference code per IEC 81346-2 is K. Surge voltage resistance is rated at 6 kV. Standard Siemens SIRIUS documentation includes a CE declaration of conformity and the product datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1BG40","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/3RH1122-1BG40 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}}