{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2140-1BD40 auxiliary contactor, size S00, 42 V DC coil, 4 NO instantaneous contacts, screw and snap-on DIN rail mounting, 45 x 57.5 x 73 mm.","salesMarkdown":"## Auxiliary contactor for control-circuit switching — 42 V DC coil, 4 NO, size S00 The Siemens 3RH2140-1BD40 is a SIRIUS auxiliary contactor in frame size S00, designed for switching control circuits in industrial panels. Its 42 V DC coil draws 4 W during both closing and holding, a low burden on the control transformer that simplifies thermal budgeting in multi-contactor assemblies. The contactor provides 4 normally-open instantaneous contacts, each rated for switching at voltages from 24 V to 690 V AC/DC. Mechanical service life is 30,000,000 operations typical, supporting high-cycle applications such as conveyor interlocking or press control sequences where the auxiliary contactor sees every machine cycle. ## Panel fit and mounting — 45 mm wide, DIN-rail snap-on, flexible orientation Width is 45 mm, height 57.5 mm, depth 73 mm — the 45 mm width is the critical panel-space dimension when ganging multiple contactors side by side. Degree of pollution 3 means the contactor is rated for environments where conductive pollution occurs — typical in industrial panels without climate control where dust and condensation may be present. ## Switching performance and environmental limits At DC the switching rate is bounded by the 7-13 ms on-time. These figures govern how fast the contactor can follow a PLC output sequence without exceeding thermal limits. Relative humidity minimum 10 % — the contactor tolerates dry environments common in switchgear rooms without condensation risk. The dual-wire entry allows daisy-chaining control wiring without additional terminal blocks. ## Compliance and substance restrictions Substance prohibitance date is 10/01/2009, aligning with RoHS compliance requirements. The product extension auxiliary switch is available (Yes), allowing field addition of extra contact blocks without replacing the base contactor.","metaTitle":"Siemens 3RH2140-1BD40 SIRIUS Auxiliary Contactor, 42 V DC","metaDescription":"Siemens 3RH2140-1BD40 SIRIUS auxiliary contactor, size S00, 42 V DC coil, 4 instantaneous NO contacts, 45 mm wide, screw and snap-on DIN rail.","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":"7 ... 13 ms","title":"3RH2140-1BD40","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"42 V","description":"Contactor relay, 4 NO, 42 V DC, Size S00, screw terminal","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 ... 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 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","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","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 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 ... 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 %","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":"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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f46b8216972942c7250ebbb3b6055a17.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=682724&mlfb=3RH2140-1BD40"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-1BD40","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/3RH2140-1BD40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}