{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-1BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-1BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-1BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH2140-1BG40, 4 NO instantaneous contacts, S00 frame, screw and snap-on mounting onto 35 mm DIN rail, DC coil.","salesMarkdown":"The DC coil draws 4 W for both pickup and hold, so the control transformer or DC supply needs to budget that continuous load per contactor. ## DC switching — what the ratings mean Unlike AC ratings, DC switching is voltage-limited by arc extinction. This contactor carries a full 10 A at 24 V DC, but that drops to 0.26 A at 600 V DC — the arc energy at higher DC voltages requires derating. Intermediate points: 4.7 A at 60 V DC, 3 A at 110 V DC, 1.2 A at 220 V DC, 0.5 A at 440 V DC, and 0.26 A at 600 V DC. The S00 frame size and 4 NO contact configuration are shared with other SIRIUS aux contactors; the deciding factor for this order code is the DC coil voltage (not explicitly listed in the available specs) and the specific DC switching curve above. ## Environmental and mounting notes Terminal capacity accepts 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid or stranded — spring-cage or screw terminals depending on variant, but this order code uses screw-type.","metaTitle":"Siemens 3RH2140-1BG40 SIRIUS Auxiliary Contactor, 4 NO","metaDescription":"Siemens SIRIUS 3RH2140-1BG40 auxiliary contactor, 4 NO contacts, S00 frame, screw/snap-on 35 mm DIN rail. DC switching ratings per voltage. Current lifecycle.","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":"3RH2140-1BG40","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":"125 V","description":"Contactor relay, 4 NO, 125 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/585f75810be3833baed358645e8b2b0f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=42833&mlfb=3RH2140-1BG40"},"ai":{"faq":[{"question":"What is the mounting method for 3RH2140-1BG40?","answer":"It mounts via screw or snap-on onto standard 35 mm DIN rail, with a 45 mm width fitting one modular position."},{"question":"Are there direct replacements for 3RH2140-1BG40?","answer":"No official successor is listed. The closest functional peer in the SIRIUS family is the 3RH2131-1AH00, which has a different contact arrangement — verify your circuit needs before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-1BG40","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/3RH2140-1BG40 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}}