{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2KV40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2KV40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2KV40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KV40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay for switching auxiliary circuits, 3RH1122-2KV40, size S00, 36 V DC coil, 10 A rated current at 24 V, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1122-2KV40 is a SIRIUS coupling relay — a size S00 auxiliary contactor designed for switching auxiliary circuits in control panels. It's the part that sits between a PLC output or pushbutton and the loads it drives: signal lamps, contactor coils, solenoid valves, or smaller motorized actuators. The 36 V DC coil means it's fed from a 36 VDC control supply, common in older or specific industrial installations where 24 VDC isn't the standard. Mounting is straightforward: screw it down or snap it onto a DIN rail. The IP20 front protection means it's intended for enclosed cabinets where no one's poking tools into live terminals. For inductive loads like contactor coils, derate significantly: at 230 V AC the rating drops to 6 A, at 400 V AC it's 3 A, and at 690 V AC it's 1 A. These are the AC-15 / DC-13 switching capacities for auxiliary contactors, and they govern whether this relay can break the inrush of the load it's driving. The contact reliability spec — one incorrect switching operation per 100 million at 17 V, 1 mA — tells you it handles dry switching (low-energy signals from a PLC or sensor) without needing a wetting current. That's critical when this relay passes a 24 VDC digital input signal; you won't get intermittent opens from contact oxidation. Built-in surge suppression via a varistor means the coil's back-EMF is clamped when de-energized. No separate flyback diode needed across the coil terminals, which saves a wiring step and reduces panel clutter. The coil draws 2.3 W DC both during pickup and hold — a constant load on the 36 VDC supply that you need to budget for. Rated surge voltage resistance at 6 kV and pollution degree 3 means it's designed for industrial environments where transient spikes from motor starts or nearby lightning are a reality. It'll hold up in a panel next to VFDs or contactors without nuisance failure. RoHS compliance is confirmed with a substance prohibitance date of July 1, 2006 — it meets the EU RoHS directive. No REACH or UL listing is explicitly stated in the available records, but as a Siemens SIRIUS component it typically carries CE and UL/CSA marks. Verify the nameplate markings against your local code requirements when the part arrives. For procurement: this is a quoted-to-order line. Submit an RFQ with your quantity and target lead time. The 73 mm depth, 45 mm width, and 60 mm height mean it fits standard S00 contactor footprints — no panel layout surprises if you're replacing an existing S00 auxiliary contactor.","metaTitle":"Siemens 3RH1122-2KV40 SIRIUS Coupling Relay, 36 V DC Coil, 1","metaDescription":"Siemens 3RH1122-2KV40 SIRIUS coupling relay for auxiliary circuits. 36 V DC coil, 10 A at 24 V, size S00, screw/snap-on mounting. Active production, sourced to order.","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":"36 V","Initial Value":"0.7","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":"1.25","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":"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","Substance Prohibitance (Date)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 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":"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","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","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","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=48731&mlfb=3RH1122-2KV40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KV40/alternatives.json"},"ai":{"faq":[{"question":"What are the key electrical ratings for this coupling relay?","answer":"The coil is rated 36 V DC. Contact ratings are 10 A at 24 V, 6 A at 230 V AC, 3 A at 400 V AC, and 1 A at 690 V AC. Surge voltage resistance is 6 kV."},{"question":"Does this relay include built-in surge suppression?","answer":"Yes, it has a varistor built in across the coil for surge suppression, eliminating the need for an external flyback diode."},{"question":"What mounting options does the 3RH1122-2KV40 support?","answer":"It supports screw mounting and snap-on mounting onto a DIN rail. It can be rotated ±180° on a vertical surface and tilted ±22.5° forward/backward."},{"question":"What is the physical size of this relay?","answer":"It has a width of 45 mm, height of 60 mm, and depth of 73 mm. It is a size S00 contactor form factor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2KV40","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/3RH1122-2KV40 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}}