{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1244-2BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1244-2BB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1244-2BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1244-2BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1244-2BB40, 24 VDC coil, 4 NO instantaneous contacts, 10 A AC-12 rated, S00 frame size, screw and snap-on mounting.","salesMarkdown":"## SIRIUS 3RH1244-2BB40 — 24 VDC Auxiliary Contactor, 4 NO, S00 Frame It carries 4 normally open instantaneous contacts rated at 10 A for AC-12 duty, which covers resistive and general-purpose loads at line voltage. The S00 frame size keeps the footprint compact at 45 mm wide, 60 mm tall, and 114 mm deep — a standard fit for SIRIUS modular systems on DIN rail or screw-mounted surfaces. The contactor is rated for 10 million mechanical operations typical, with a contact reliability of 1 faulty switching per 100 million at 17 V, 1 mA — a strong signal-level performance for PLC inputs or safety relay chains. Mounting is via screw or snap-on onto DIN rail. Terminal capacity accepts 2x (0.25 to 2.5 mm²) solid or 2x (0.25 to 1.5 mm²) finely stranded with ferrule — standard for control wiring up to 14 AWG. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms — sufficient for most industrial vibration environments.","metaTitle":"Siemens SIRIUS 3RH1244-2BB40 Auxiliary Contactor, 24 VDC, 4","metaDescription":"Siemens SIRIUS 3RH1244-2BB40 auxiliary contactor, 24 VDC coil, 4 NO contacts, 10 A AC-12. S00 size, screw/snap-on mount. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"114 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","At The Side":"0 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.8","Mounting Type":"screw and snap-on mounting","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","Auxiliary Switch":"No","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","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","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","Instantaneous Contact":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 W","operating current at AC-12 maximum":"10 A","Surge Voltage Resistance Rated Value":"6 kV","reference code acc. to DIN EN 81346-2":"K","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 (0.25 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"Cage Clamp terminals","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","number of NC contacts for auxiliary contacts":"4","number of NO contacts for auxiliary contacts":"4","with degree of pollution 3 at AC rated value":"690 V","Type Of Voltage Of The Control Supply Voltage":"DC","operating current at AC-15 at 230 V rated value":"6 A","operating current at AC-15 at 400 V rated value":"3 A","operating current at AC-15 at 500 V rated value":"2 A","operating current at AC-15 at 690 V rated value":"1 A","Identification Number And Letter For Switching Elements":"44 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (24 ... 14)"}},"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=350948&mlfb=3RH1244-2BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1244-2BB40/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RH1244-2BB40?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through independent distribution channels."},{"question":"What is the closest functional second-source to 3RH1244-2BB40?","answer":"The 3RT1016-1BB42 is a contactor with a similar S00 frame and 24 VDC coil, but it is a power contactor with main contacts, not an auxiliary contactor. The 3RH1244-2BB40 is the dedicated auxiliary contactor variant with 4 NO auxiliary contacts. They share the same mounting footprint and coil voltage, so a panel designed for the 3RT1016-1BB42 can accept the 3RH1244-2BB40 without rewiring, provided the auxiliary contact count meets the circuit requirements."},{"question":"What is 3RH1244-2BB40's listed depth?","answer":"The depth is 114 mm."},{"question":"What is 3RH1244-2BB40's listed solid wire capacity?","answer":"Solid wire capacity is 2x (0.25 to 2.5 mm²)."},{"question":"Will 3RH1244-2BB40 drop into a panel specified around 3RT1016-1BB42 without rewiring?","answer":"Yes, both parts share the S00 frame size, same 45 mm width, and same screw/snap-on mounting. The coil voltage is identical at 24 VDC. The 3RH1244-2BB40 provides 4 NO auxiliary contacts, while the 3RT1016-1BB42 is a power contactor with main contacts. If the circuit only needs auxiliary contacts, the 3RH1244-2BB40 is a direct mechanical and electrical fit."},{"question":"What compliance documentation does Siemens provide for 3RH1244-2BB40?","answer":"Siemens SIRIUS components typically carry CE, UL, CSA, and CCC certifications, with RoHS and REACH compliance declarations available through the manufacturer's documentation portal. Specific certification markings should be verified against the nameplate on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1244-2BB40","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/3RH1244-2BB40 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}}