{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1344-2BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1344-2BB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1344-2BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1344-2BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1344-2BB40, Size S00, 24 VDC coil, 4 NO contacts, 10 A AC-12, IP20 front, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1344-2BB40 is a SIRIUS auxiliary contactor — a 24 VDC-controlled, 4-NO switching block sized for Size S00 contactor systems. Rated 10 A at AC-12 (resistive loads at 24 V), and 1 A at 110 V or 0.27 A at 220 V — that's the switching capacity for its auxiliary contacts under different control voltages. The 4 NO contacts are instantaneous (no make-before-break or delayed switching), so it's a straight on/off relay block for signal-level or pilot-duty circuits. Coil holds at 24 VDC nominal, pulling 3.2 W to close and the same 3.2 W to hold — no inrush spike to stress a DC supply. That covers most cabinet layouts without needing a special bracket. Depth is 114 mm, which fits standard 120 mm deep enclosures. Wire termination accepts 2x (0.25 … 2.5 mm²) solid or 2x (0.25 … 1.5 mm²) fine-stranded with ferrules — standard for control wiring. Shock resistance is 10g / 5 ms and 5g / 10 ms — robust enough for industrial panels on conveyors or machine tools. Surge voltage withstand is 6 kV, covering common transient events in industrial mains.","metaTitle":"Siemens 3RH1344-2BB40 SIRIUS Auxiliary Contactor, 24 VDC, 4","metaDescription":"Siemens SIRIUS auxiliary contactor 3RH1344-2BB40, 24 VDC coil, 4 NO contacts, 10 A AC-12, IP20 front, Size S00, screw/snap-on mount. 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","Inductive Power Factor With Closing Power Of The Coil":"0.8","Identification Number And Letter For Switching Elements":"44 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","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=339268&mlfb=3RH1344-2BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1344-2BB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1344-2BB40 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ to get a firm price and lead time."},{"question":"What is 3RH1344-2BB40's listed depth?","answer":"The listed depth is 114 mm, which fits standard 120 mm deep enclosures."},{"question":"What wire sizes does the 3RH1344-2BB40 accept?","answer":"It accepts 2x (0.25 … 2.5 mm²) solid wire, or 2x (0.25 … 1.5 mm²) fine-stranded with ferrules."},{"question":"Will 3RH1344-2BB40 drop into a panel specified around 3RT1016-1BB42?","answer":"Both are Size S00 devices with the same 45 mm width and DIN-rail mounting, so they share the same panel footprint and wiring space. The main difference is that 3RH1344-2BB40 is a pure auxiliary contactor (4 NO, no main power contacts), while 3RT1016-1BB42 is a power contactor with its own coil and main contacts. For auxiliary switching, the 3RH1344-2BB40 drops in without rewiring if the panel already has a separate contactor for the load circuit."},{"question":"What compliance documentation does Siemens provide for 3RH1344-2BB40?","answer":"Siemens typically provides RoHS and REACH declarations, plus IEC/EN 60947-4-1 certification for this SIRIUS series. Specific documentation is available on request with your order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1344-2BB40","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/3RH1344-2BB40 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}}