{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1HB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1HB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1HB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1HB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH1122-1HB40, 24 V DC coil, 10 A rated current, 2 NO instantaneous contacts, size S00, IP20, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1122-1HB40 is a SIRIUS coupling relay designed for switching auxiliary circuits in control panels. It carries a 24 V DC coil with a holding power of 2.3 W, and its contacts are rated for 10 A at 24 V — enough for pilot-duty loads like contactor coils, indicator lamps, and PLC inputs. The 2 NO instantaneous contacts (no leading, lagging, or delayed switching) mean it closes and opens in step with the coil, which is what you want for straightforward interlock or signal-repeat functions. Size S00 (45 mm wide, 57.5 mm tall, 72 mm deep) and screw-and-snap-on mounting let it land on a standard DIN rail in a crowded panel without eating up extra width. For inductive DC loads (contactors, solenoids), you'll need to derate; the part's own switching capacity at higher voltages drops to 1 A at 110 V, 0.27 A at 220 V, and 1 A at 690 V, which tracks the typical DC-13 derating curve. The 6 kV surge voltage resistance (rated impulse withstand) means it can handle transient spikes on a 400 V industrial network without flashover — important for panel builders coordinating with upstream surge protection. That's the dry-circuit (low-energy) reliability figure — it tells you the silver-alloy contacts are designed to switch logic-level signals without needing a wetting current, which is why this relay is often used to isolate PLC outputs from the power circuit. The 10g / 5 ms and 5g / 10 ms shock resistance, combined with the wide operating temperature range of -25 to +60 °C, makes it suitable for machine-tool cabinets and conveyor-line panels where vibration and ambient heat are present.","metaTitle":"Siemens 3RH1122-1HB40 SIRIUS Coupling Relay, 24 VDC, 10 A, 2","metaDescription":"Siemens 3RH1122-1HB40 SIRIUS coupling relay, 24 VDC coil, 10 A rated current, 2 instantaneous NO contacts, IP20, size S00. Active 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":"24 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)":"01.07.2006 00:00:00","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","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","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"}},"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=140833&mlfb=3RH1122-1HB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1HB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RH1122-1HB40?","answer":"The 3RT1015-1BB42 is a contactor, not a coupling relay — it includes a power contact block and a different coil voltage (24 V DC, but the 3RT series is for motor switching, not auxiliary circuit isolation). The 3RH1122-1HB40 is a dedicated coupling relay with 2 NO auxiliary contacts; a direct functional equivalent would be another SIRIUS coupling relay with the same contact configuration and coil voltage, not a contactor from the 3RT family."},{"question":"What is the depth of the 3RH1122-1HB40?","answer":"72 mm. Combined with the 45 mm width and 57.5 mm height, it fits the size S00 DIN-rail footprint."},{"question":"What wire sizes does the 3RH1122-1HB40 accept?","answer":"The screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm² solid conductors."},{"question":"Will the 3RH1122-1HB40 drop into a panel specified for a 3RT1015-1BB42 without rewiring?","answer":"No. The 3RT1015-1BB42 is a contactor with a different terminal layout, coil circuit, and main power contacts. The 3RH1122-1HB40 is a coupling relay with auxiliary contacts only — the wiring scheme, terminal assignments, and load ratings are different. A panel designed for the 3RT1015-1BB42 would require rewiring to accommodate the 3RH1122-1HB40."},{"question":"What compliance documentation does Siemens provide for the 3RH1122-1HB40?","answer":"The part carries a substance prohibitance date of 01.07.2006, indicating RoHS compliance from that date forward. The reference code per IEC 81346-2 is K (relay/contactor). No UL, CSA, or specific marine approvals are listed in the available spec data."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1HB40","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/3RH1122-1HB40 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}}