{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH6140-1KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH6140-1KF40","canonicalUrl":"https://aoctrl.com/siemens/3RH6140-1KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH6140-1KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, size S00, 4 NO contacts, 110 VDC coil, screw terminals, snap-on 35 mm DIN rail.","salesMarkdown":"The Siemens 3RH6140-1KF40 is a SIRIUS coupling relay — a DC-operated auxiliary contactor in the S00 frame, designed to switch control and signal circuits rather than motor loads. Its 4 normally-open contacts give you four independent switching paths, each rated 6 A at 24 VDC (AC-12) and 10 A at 230 VAC. The 6 kV surge voltage resistance means the relay handles transient spikes common in industrial panels without flashover — a real concern when the contactor sits near drives or switching power supplies. The coil is 110 VDC, pulling 2.8 W during both closing and holding. A built-in suppressor diode clips the inductive kick when the coil de-energizes. ## Mounting and wiring — panel-builder notes Snaps onto 35 mm mounting rail with a screw-down clamp. The S00 footprint is 45 mm wide, 57.5 mm tall, 73 mm deep. Screw-type terminals accept 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm² solid/stranded wire. For finely stranded wire with ferrules, the range is 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²). ## Contact reliability and switching frequency That's the dry-circuit threshold — it tells you the silver-alloy contacts are gold-flashed or otherwise treated to switch low-energy signals (PLC inputs, status lamps) without oxidation failures. Mechanical life is 30 million cycles typical. Maximum switching frequency is 10,000 operations per hour for both AC and DC loads, dropping to 1,000 per hour under DC-12 and DC-13 duty — the inductive DC loads heat the contacts faster.","metaTitle":"Siemens 3RH6140-1KF40 SIRIUS Coupling Relay, 4 NO, 110 VDC","metaDescription":"Siemens SIRIUS 3RH6140-1KF40 coupling relay, size S00, 4 NO contacts, 110 VDC coil, 6 A at 24 V, screw terminals, snap-on 35 mm rail. Active production.","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":"10 000 1/h","title":"3RH6140-1KF40","Height":"57.5 mm","Rated Value":"110 V","description":"Coupling contactor relay, 4 NO w. integrated suppressor diode size S00, screw terminal","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","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","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"6 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 690 V rated value":"1 A","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"suppressor diode","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.8 W","holding power of magnet coil at DC":"2.8 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":"6 A","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)","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","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/76bd4d88d8080d04f8c4e33c6c84a081.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=641400&mlfb=3RH6140-1KF40"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH6140-1KF40","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/3RH6140-1KF40 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}}