{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2FM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2FM40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2FM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2FM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, 24 VDC coil with integrated diode suppression, screw and snap-on mounting on 35 mm DIN rail, 45 mm width.","salesMarkdown":"It's a signal-switching block, not a power contactor — it routes control signals and feedback from the main contactor or starter to the PLC or relay logic. The coil pulls in on 24 VDC nominal, with a closing power draw of 4 W. An integrated diode across the coil handles the flyback spike — no external snubber needed, but verify polarity before wiring: reverse the DC feed and the diode conducts, killing the coil supply. The contact ratings are given per IEC utilization category at specific voltages. At 24 V rated value it switches 10 A; at 110 V rated value it drops to 3 A; at 220 V rated value it handles 1.2 A. These are resistive-load (AC-12 / DC-12) figures — inductive loads derate further. If you're switching a 24 VDC relay coil, the 10 A rating gives plenty of headroom; if you're piloting a 220 VAC contactor, the 1.2 A limit is the one to size against. Electrical life depends on the switched current and voltage; at the rated AC-15 / DC-13 values expect a fraction of that number. The arcing time spans 10 to 15 ms, which matters for timing coordination in safety circuits. That covers most cabinet layouts without derating. Dimensions: 45 mm wide, 70 mm high, 73 mm deep — a compact S00 footprint. That's the minimum air gap to grounded metal for the rated insulation voltage; crowding it closer than that risks flashover at 690 V. Compliance: RoHS substance prohibition date of October 1, 2009, so it meets the EU RoHS directive.","metaTitle":"Siemens 3RH2140-2FM40 SIRIUS Auxiliary Contactor, 4 NO, 24 V","metaDescription":"Siemens SIRIUS 3RH2140-2FM40 auxiliary contactor, size S00, 4 NO contacts, 24 VDC coil with diode suppression. 45 mm wide, DIN rail mount. Current-production, sourced to order. Req","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 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":"220 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":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 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":"4","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"diode","Product Extension Auxiliary Switch":"Yes","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","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","for AWG cables for auxiliary contacts":"2x (20 ... 12)","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 NO contacts for auxiliary contacts":"4","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":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","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/ea58bc5a08fd589ada1928171ca81f64.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=569329&mlfb=3RH2140-2FM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2FM40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2140-2FM40 and how is it quoted?","answer":"It is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your volume."},{"question":"Will 3RH2140-2FM40 drop into a panel specified around 3RH2140-1BP40 without rewiring?","answer":"Both are SIRIUS size S00 auxiliary contactors on the same 45 mm DIN-rail footprint, so the mechanical fit is identical. The difference is the coil: the -2FM40 is 24 VDC with a built-in diode, while the -1BP40 is a different coil variant. Check your control voltage and polarity before swapping — the wiring pattern to the coil terminals is the same, but the diode makes polarity-sensitive wiring mandatory."},{"question":"What compliance documentation does Siemens provide for 3RH2140-2FM40?","answer":"The part carries a RoHS compliance date of October 1, 2009, meeting EU RoHS requirements. It is rated for degree of pollution 3 per IEC 60947-1. Siemens typically provides a declaration of conformity and CE marking for the SIRIUS series; specific UL/CSA file numbers are not listed in this evidence but are standard for the SIRIUS line."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2FM40","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/3RH2140-2FM40 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}}