{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-4BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-4BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-4BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-4BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2140-4BG40 auxiliary contactor, size S00, 4 NO instantaneous contacts, screw and snap-on 35 mm DIN rail, 73 x 45 x 57.5 mm, rated 10 A at 230 V, 6 kV surge voltage.","salesMarkdown":"It mounts via screw or snap-on onto a 35 mm standard mounting rail, with a footprint of 73 mm deep, 45 mm wide, and 57.5 mm tall — a compact envelope that fits into crowded DIN-rail panels alongside contactors and overload relays of the same S00 family. Pollution degree 3 and a surge voltage resistance rated at 6 kV mean it's built for industrial control panels where transient spikes from inductive loads are the norm, not the exception. The operating range of -25 to +60 °C covers most ventilated enclosure environments, and the mounting position is flexible — ±180° rotation on a vertical surface, plus ±22.5° tilt forward or backward — so it adapts to tight layout constraints without derating. ## What the contact ratings mean for your circuit The 4 NO contacts are rated for breaking at specific voltages, not a single blanket current. At 230 V AC the contacts handle 10 A; at 400 V AC they break 3 A; at 690 V AC they break 1 A. For DC circuits, the 24 V rated value is 10 A, dropping to 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.5 A at 440 V. This voltage-dependent derating is typical for DC switching where arc extinction is harder — match your control voltage to the row that covers your load current, not the highest number on the table. The closing and holding power of the DC magnet coil is 4 W steady. ## Clearance, arcing, and switching frequency The auxiliary switch extension capability (Product Extension Auxiliary Switch: Yes) means you can add a front-mounted auxiliary block later without swapping the base unit. The 0.8 initial value and 1.1 full-scale value likely refer to the contact force or pick-up/drop-out ratio.","metaTitle":"Siemens 3RH2140-4BG40 SIRIUS Auxiliary Contactor, 4 NO, S00","metaDescription":"Siemens SIRIUS 3RH2140-4BG40 auxiliary contactor, size S00, 4 NO contacts, 73x45x57.5 mm, screw/snap-on 35 mm DIN rail, rated 10 A at 230 V, 6 kV surge, -25 to +60 °C, current life","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","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","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","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","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","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":"ring terminal lug connection","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/d21806dc9db836796ef36eefaa059036.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=487283&mlfb=3RH2140-4BG40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-4BG40/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2140-4BG40 drop into a panel that was specified around 3RH2140-1BP40 without rewiring?","answer":"Both are SIRIUS S00 auxiliary contactors with the same DIN-rail footprint and 45 mm width, so the mechanical fit is identical. The 3RH2140-4BG40 carries 4 NO contacts; the 3RH2140-1BP40 may have a different contact configuration (e.g., NO/NC mix), so verify your control scheme before swapping — the wiring terminal layout is the same, but the contact logic may differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-4BG40","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/3RH2140-4BG40 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}}