{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-1AK20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-1AK20","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-1AK20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1AK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, screw and snap-on 35 mm DIN rail mounting, 73 x 45 x 57.5 mm.","salesMarkdown":"It provides four normally-open instantaneous contacts for switching control circuits, signal interlocking, or extending the contact count on a main contactor. Depth is 73 mm, width 45 mm, height 57.5 mm, so it fits the same footprint as other S00 auxiliaries; no need to gut the existing layout if you are swapping in from an earlier SIRIUS generation. The 3RH2140-1AK20 carries a rated switching current of 10 A at 24 V and also 10 A at 230 V, both at 50/60 Hz. For DC switching the curve is steeper: 4.7 A at 60 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. The arcing time runs 10 to 15 ms. These are the values that govern whether the contactor holds up under your specific pilot-duty or signal load — match the voltage and current on your coil or indicator circuit against the appropriate row, not the highest number on the datasheet. The contactor is rated for 30 million mechanical operations typical, which for a frequently cycled interposing relay means years of service before the contacts wear.","metaTitle":"Siemens 3RH2140-1AK20 SIRIUS Auxiliary Contactor, 4 NO, Size","metaDescription":"Siemens SIRIUS 3RH2140-1AK20 auxiliary contactor. 4 instantaneous NO contacts. Size S00. Rated 10 A at 24 V, 10 A at 230 V. Screw and snap-on 35 mm DIN rail. Current lifecycle stag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"4 ... 15 ms","at DC":"10 000 1/h","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","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","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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 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 50 Hz rated value":"120 V","at 500 V rated value":"2 A","at 60 Hz rated value":"120 V","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","Product Extension Auxiliary Switch":"Yes","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 ... 16), 2x (18 ... 14), 2x 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)","with low demand rate according to SN 31920":"40 %","apparent holding power of magnet coil at AC":"5.7 VA","apparent pick-up power of magnet coil at AC":"37 VA","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":"AC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.8","Identification Number And Letter For Switching Elements":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.25","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","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/d966eac890e4c39d3905a9d3658cd1c3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=496489&mlfb=3RH2140-1AK20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1AK20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2140-1AK20 and how do I get a price?","answer":"The 3RH2140-1AK20 is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability."},{"question":"Will 3RH2140-1AK20 drop into a panel that was specified around 3RH2131-2AK60 without rewiring?","answer":"Both are SIRIUS size S00 auxiliary contactors on the same 35 mm DIN-rail footprint, so the mechanical fit and mounting are identical. The difference is contact configuration: the 3RH2140-1AK20 carries four NO contacts, while the 3RH2131-2AK60 carries a different contact arrangement. If your control circuit needs four NO contacts, this part drops in without rewiring the panel layout — just verify the contact count matches your schematic."},{"question":"What compliance documentation does Siemens provide for 3RH2140-1AK20?","answer":"The part is RoHS compliant with a substance prohibition date of 10/01/2009, and carries a degree of pollution rating of 3. Siemens typically provides CE declaration of conformity and material declarations through their support portal; UL and CSA listings are standard for the SIRIUS range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-1AK20","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/3RH2140-1AK20 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}}