{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1344-1BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1344-1BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH1344-1BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1344-1BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1344-1BG40, 4 NO instantaneous contacts, size S00, 45 mm width, 10 A at 24 V rated value, screw and snap-on mounting, IP20 front protection.","salesMarkdown":"It carries 4 normally-open instantaneous contacts, meaning it closes the circuit the moment the coil is energized, with no built-in delay. At 230 V the rating drops to 6 A, and at 400 V it's 3 A — the thermal curve follows the standard IEC 60947-5-1 derating for auxiliary contacts. The 6 kV rated surge voltage resistance means it can sit on the same panel as drives and switching supplies without flashover on transient events. At 45 mm wide and 57.5 mm tall, it occupies a single modular slot — the same footprint as the S00 contactor frame it's designed to companion. Depth is 111 mm, which includes the coil terminals and contact screws; plan for that plus finger space when laying out the gland plate. Shock resistance is tested at 10 g for 5 ms and 5 g for 10 ms — enough for machine-mounted applications near presses or conveyors. That's the standard industrial pollution severity for an enclosed panel — no special conformal coating needed for the contactor itself. ## Coil and switching details The DC magnet coil draws 3.2 W both at pickup and hold — no power drop after closure, which is typical for DC-operated contactors. That 3.2 W load needs to be factored into the PLC output or relay driving it; a 24 VDC output card with a 0.5 A per channel rating can drive several of these in parallel, but check the total current budget. For gold-flashed or bifurcated contacts you'd see better, but for a standard silver-alloy contact this is a solid figure for PLC input sensing or low-current interlock circuits.","metaTitle":"Siemens 3RH1344-1BG40 SIRIUS Auxiliary Contactor, 4 NO, S00,","metaDescription":"Siemens SIRIUS 3RH1344-1BG40 auxiliary contactor, 4 NO contacts, size S00, 45 mm width, 10 A at 24 V. Current production. Screw and snap-on mounting. IP20 front. RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"111 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":"0.8","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":"1.1","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","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":"10 000 000","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":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 W","Surge Voltage Resistance Rated Value":"6 kV","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","reference code according to IEC 81346-2":"K","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","with low demand rate according to SN 31920":"40 %","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"4","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"44 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=510077&mlfb=3RH1344-1BG40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1344-1BG40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RH1344-1BG40?","answer":"The closest functional peer in the SIRIUS family is the 3RT1015-1BB42, which is a main contactor rather than an auxiliary contactor. The 3RH1344-1BG40 is specifically an auxiliary contactor with 4 NO contacts, while the 3RT1015-1BB42 is a main contactor with its own auxiliary block. They share the S00 frame size and 45 mm width, so the 3RH1344-1BG40 can be mounted alongside or as a companion to the 3RT1015-1BB42 on the same DIN rail. For a pure auxiliary contactor replacement, the 3RH1344-1BG40 is the direct fit."},{"question":"What is the depth of the 3RH1344-1BG40?","answer":"The depth is 111 mm, measured from the mounting surface to the furthest protruding point (typically the screw terminals). This is standard for the S00 frame size auxiliary contactors."},{"question":"What wire sizes does the 3RH1344-1BG40 accept?","answer":"The terminals accept solid conductors in these combinations: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm². This allows daisy-chaining of two conductors per terminal for the smaller sizes."},{"question":"Will 3RH1344-1BG40 drop into a panel specified around 3RT1015-1BB42?","answer":"Yes, the 3RH1344-1BG40 shares the same S00 frame size and 45 mm width as the 3RT1015-1BB42. It mounts on the same 35 mm DIN rail and uses the same screw and snap-on fastening method. The depth is also comparable at 111 mm. No rewiring of the DIN rail or mounting plate is needed."},{"question":"What compliance documentation does Siemens provide for 3RH1344-1BG40?","answer":"The part is RoHS compliant with a substance prohibition date of July 1, 2006. The IP20 front protection rating is declared. The product carries a 6 kV rated surge voltage resistance, indicating it meets IEC 60947-5-1 requirements for auxiliary contactors. The pollution degree is rated 3 per IEC standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1344-1BG40","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/3RH1344-1BG40 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}}