{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1KG40-0LA4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1KG40-0LA4","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1KG40-0LA4","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KG40-0LA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, order code 3RH1122-1KG40-0LA4, 125 V DC coil, 2 NO + 2 NC contacts, rated 10 A at 24 V, screw and snap-on mounting, IP20 front.","salesMarkdown":"It carries a 125 V DC coil with an integrated varistor surge suppressor, so you don't need to add a separate suppression diode or RC snubber across the coil terminals. That saves a wiring step and a part on the BOM. The contact set is 2 NO + 2 instantaneous contacts (the 2 in the order code). Rated operational currents are given per voltage: 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are AC ratings for general-purpose switching — think control transformers, relay coils, signal lamps, PLC inputs. The 10 A at 24 V handles a bank of contactor coils; the 1 A at 690 V tells you it can switch a small motor contactor in a 690 V line. Contact reliability is specified at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — that covers dry-contact PLC-level signals without stuttering. That matters when you're shoehorning it into a tight corner of a panel. ## Coil power and wiring Closing power of the magnet coil at DC is 11 W; holding power drops to 4 W. That's typical for a DC-operated contactor — the inrush is higher to pull in, then the holding circuit reduces power. The varistor across the coil absorbs the back-EMF spike when the coil de-energizes, which is the main reason DC coils need external suppression. Here it's built in. Terminal capacity accepts 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm² solid/stranded — covers common control wiring sizes without needing ferrules for the smaller strands.","metaTitle":"Siemens 3RH1122-1KG40-0LA4 SIRIUS Auxiliary Contactor, Size","metaDescription":"Siemens 3RH1122-1KG40-0LA4 SIRIUS auxiliary contactor, size S00, 125 V DC coil. 2 NO + 2 NC contacts. 10 A at 24 V, 6 A at 230 V. Screw/snap-on mounting, IP20. Active production. S","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":"0.7","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)":"01.07.2006 00:00:00","Design Of The Surge Suppressor":"with varistor","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","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":"70 %","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":"1","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":"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":"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=248813&mlfb=3RH1122-1KG40-0LA4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KG40-0LA4/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1122-1KG40-0LA4?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional second-source for 3RH1122-1KG40-0LA4?","answer":"The peer 3RH2122-1BW40 is a size S00 auxiliary contactor with a different coil voltage and contact arrangement. It will not drop into the same panel without rewiring — verify the coil rating and contact count against your BOM before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1KG40-0LA4","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/3RH1122-1KG40-0LA4 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}}