{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2BA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2BA40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2BA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2BA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2140-2BA40 auxiliary contactor, size S00, 4 NC instantaneous contacts, screw and snap-on mounting for 35 mm DIN rail, 45 mm width, 73 mm depth, 70 mm height.","salesMarkdown":"## What this SIRIUS auxiliary contactor does in a panel The 3RH2140-2BA40 is a SIRIUS auxiliary contactor, size S00, carrying four normally-closed (NC) instantaneous contacts. It switches control signals in a motor starter or relay logic circuit — not the motor power itself, but the feedback and interlock wiring that tells the PLC the main contactor is pulled in or the safety circuit is made. Rated 10 A at both 24 V and 230 V, these NC contacts handle the common control voltages in a 24 VDC panel or a 230 VAC line without a contact derating step. The 4 W closing and holding power on the DC coil means the PLC output or relay driving it needs to source at least that — a standard 24 VDC digital output handles it easily. The contacts are rated for 30,000,000 typical mechanical operations — this is a relay-grade life, not a power-contactor life. It fits applications where the auxiliary circuit cycles with every machine cycle, not just on fault events. ## Panel fit: DIN rail, clearances, and mounting position That 6 mm side gap is tight — adjacent devices can sit nearly flush, but the arc chamber needs that 6 mm to vent. ## Lifecycle and sourcing: current production, quoted to order The 3RH2140-2BA40 carries a product extension for auxiliary switches, meaning it accepts add-on contact blocks if the four built-in NC contacts aren't enough. That extension is a standard SIRIUS accessory — no special adapter needed.","metaTitle":"Siemens 3RH2140-2BA40 SIRIUS Auxiliary Contactor, 4 NC, S00","metaDescription":"Siemens 3RH2140-2BA40 SIRIUS auxiliary contactor, size S00, 4 NC contacts, 45 mm wide. Rated 10 A at 24 V and 230 V.","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":"3RH2140-2BA40","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"12 V","description":"Contactor relay, 4 NO, 12 V DC, Size S00, Spring-type 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 standard mounting 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","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 ... 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 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/393073291839c5b7668e78125db39b93.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=115300&mlfb=3RH2140-2BA40"},"ai":{"faq":[{"question":"What is the 3RH2140-2BA40 used for?","answer":"It is a SIRIUS auxiliary contactor, size S00, with four NC contacts. It switches control signals in motor starter or relay logic circuits — providing feedback and interlock wiring to the PLC or safety circuit."},{"question":"What are the key ratings of the 3RH2140-2BA40?","answer":"Coil closing and holding power is 4 W DC. Mechanical life is 30,000,000 operations typical."},{"question":"What is the width and depth of the 3RH2140-2BA40?","answer":"Width is 45 mm, depth is 73 mm, height is 70 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2BA40","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/3RH2140-2BA40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}