{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2371-2FB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2371-2FB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2371-2FB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2371-2FB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH2371-2FB40, 24 V DC coil, 7 NO instantaneous contacts, 10 A rated current, screw and snap-on mounting for 35 mm DIN rail.","salesMarkdown":"It carries 7 instantaneous normally-open contacts, each rated at 10 A at 24 V, making it suitable for high-count signal multiplication or interlocking across multiple contactor coils and PLC inputs. The coil pulls in on 24 V DC with a 4 W holding power, and the built-in diode surge suppressor handles the inductive kickback — no external flyback diode needed across the coil terminals. Mounts on a 35 mm DIN rail via the integrated snap-on latch, with screw terminals accepting 2 x 0.5 to 4 mm² solid or stranded wire. The S00 footprint takes up 45 mm width, 70 mm height, and 121 mm depth — plan the panel layout to leave 10 mm clearance above, below, and forward, plus 6 mm at the sides for airflow and wiring access. The 10 A rating at 24 V DC is the continuous current each NO contact can carry in a control circuit. At higher voltages the current must be derated. The 7 NO contacts give you flexibility to wire multiple signal paths from a single coil — common in safety circuits where you need to mirror a status to several PLC inputs or to interlock multiple contactors.","metaTitle":"Siemens 3RH2371-2FB40 SIRIUS Auxiliary Contactor, 24 V DC, 7","metaDescription":"Siemens SIRIUS 3RH2371-2FB40 auxiliary contactor, size S00, 24 V DC coil, 7 instantaneous NO contacts, 10 A rated current. Screw and snap-on mounting for 35 mm DIN rail. Sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"121 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"38 ... 65 ms","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.1","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","Solid Or Stranded":"2x (0,5 ... 4 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"7","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"diode","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"4 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 12)","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"7","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"71","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded 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","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0fb448b4a2b816f13fd3d2b83fb62032.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=21847&mlfb=3RH2371-2FB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2371-2FB40/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2371-2FB40 drop into a panel specified around 3RH2362-2AF00 without rewiring?","answer":"Both are SIRIUS size S00 auxiliary contactors with the same DIN rail footprint and screw terminal layout, so mechanical fit and wiring are identical. The difference is contact configuration: 3RH2371-2FB40 has 7 NO contacts, while 3RH2362-2AF00 has a different contact arrangement — verify your circuit needs before swapping."},{"question":"What is the depth of 3RH2371-2FB40?","answer":"The depth is 121 mm, which is the dimension from the DIN rail mounting surface to the furthest front point of the contactor body."},{"question":"What is the width of 3RH2371-2FB40?","answer":"The width is 45 mm, which is the space it occupies on the DIN rail — plan for at least 6 mm side clearance to adjacent devices."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2371-2FB40","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/3RH2371-2FB40 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}}