{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH6122-1KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH6122-1KB40","canonicalUrl":"https://aoctrl.com/siemens/3RH6122-1KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH6122-1KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH6122-1KB40, size S00, 24 V DC coil, 2 NO + 2 NC contacts, screw-type terminals, snap-on 35 mm DIN rail mounting.","salesMarkdown":"Its job is to take a 24 V DC control signal and pass it through to downstream logic or loads via 2 normally-open and 2 normally-closed contacts, each rated 6 A at 24 V. The coil holds at 2.8 W DC, with an integrated suppressor diode across the coil to clip the flyback spike when de-energizing — that diode matters if you're driving this from a PLC output or a solid-state source that can't absorb the inductive kick. Snap it onto a 35 mm DIN rail in a control panel; the screw terminals accept up to 2x 4 mm² solid or 2x 2.5 mm² stranded, so it'll land in most European-style marshalling cabinets without adapters. The size S00 footprint is 45 mm wide by 73 mm deep by 57.5 mm tall. The contacts are rated for AC-12 and DC-12/DC-13 loads. At 24 V DC the continuous current is 6 A; at 110 V DC it drops to 3 A, at 220 V DC to 1.2 A, and at 690 V AC to 1 A. The 2 NO + 2 NC contact arrangement (22 E designation) is the standard auxiliary block for this frame. Installation altitude is limited to 2,000 m above sea level without derating. The part is RoHS-compliant per the substance prohibition date of May 1, 2012. No UL or CSA listing is stated in the spec record, but the SIRIUS family typically carries IEC 60947-5-1 certification for auxiliary contactors. The suppressor diode across the coil is a factory-fitted design — no external snubber required for DC switching.","metaTitle":"Siemens 3RH6122-1KB40 SIRIUS Coupling Relay, 24 V DC, 2 NO +","metaDescription":"Siemens SIRIUS coupling relay 3RH6122-1KB40, 24 V DC coil, 2 NO + 2 NC contacts, 6 A rated current. Screw terminals, snap-on DIN rail mount. Current production. Sourced to order ag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"10 000 1/h","title":"3RH6122-1KB40","Height":"57.5 mm","Rated Value":"24 V","description":"Coupling contactor relay, DC 24 V, 0.7...1.25*US, 2 NO + 2 NC, w. integrated suppressor diode size S00, screw terminal","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","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","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"6 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 690 V rated value":"1 A","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"suppressor diode","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.8 W","holding power of magnet coil at DC":"2.8 W","Surge Voltage Resistance Rated Value":"6 kV","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","operational current at AC-12 maximum":"6 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","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)","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","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f0e218d34d1ac4552ca2b3ac2166275b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=641371&mlfb=3RH6122-1KB40"},"ai":{"faq":[{"question":"Will 3RH6122-1KB40 drop into a panel designed for 3RH6131-1BF40 without rewiring?","answer":"The mechanical footprint is identical — both are size S00, 45 mm wide, snap onto 35 mm DIN rail, and use screw terminals. The wiring pattern differs because the contact arrangement is different (2 NO + 2 NC vs 1 NO + 3 NC). If the panel wiring assumes three NC contacts, you would need to re-terminate the NC circuits."},{"question":"What compliance documentation does Siemens provide for 3RH6122-1KB40?","answer":"The part is RoHS-compliant per the substance prohibition date of May 1, 2012. The SIRIUS family typically carries IEC 60947-5-1 certification for auxiliary contactors. No UL or CSA listing is stated in the spec record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH6122-1KB40","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/3RH6122-1KB40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}