{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2440-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2440-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RH2440-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2440-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH2440-1BW40, size S00, 4 NO contacts, screw and snap-on mounting on 35 mm DIN rail, 73 mm depth, 90 mm width.","salesMarkdown":"The Siemens 3RH2440-1BW40 is a SIRIUS auxiliary contactor in the compact S00 frame — 57.5 mm high, 90 mm wide, 73 mm deep — designed for screw and snap-on mounting onto a standard 35 mm DIN rail. This auxiliary contactor carries 4 instantaneous normally-open (NO) contacts, rated for a thermal current of 10 A at both 24 V rated value and 230 V rated value. Switching capacity varies with voltage: at 60 V the rated value is 4.7 A, at 110 V it is 3 A, at 220 V it is 1.2 A, at 400 V it is 3 A, at 440 V it is 0.5 A, at 500 V it is 2 A, at 600 V it is 0.26 A, and at 690 V it is 1 A — so the contacts handle higher currents at lower control voltages and derate significantly above 400 V. Mechanical endurance is rated at 5,000,000 operating cycles typical for the contactor, with a maximum switching frequency of 10,000 operations per hour at AC and an arcing time of 10 to 15 ms. ## Coil and environmental specs The magnet coil draws 4 W closing power and 4 W holding power at DC. Operating temperature range is -25 to +60 °C, storage range is -55 to +80 °C, and relative humidity minimum is 10 % — suitable for unconditioned industrial enclosures.","metaTitle":"Siemens 3RH2440-1BW40 SIRIUS Auxiliary Contactor, 4 NO, S00","metaDescription":"Siemens SIRIUS 3RH2440-1BW40 auxiliary contactor, 4 NO contacts, size S00, screw and snap-on 35 mm DIN rail, 73 mm depth. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"90 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","title":"3RH2440-1BW40","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":"48 V","description":"Contactor relay, latched, 4 NO, 48 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":"5 000 000","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","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","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":"5 000 000","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/1ff8292e2379abe228fbf91448560fff.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=884094&mlfb=3RH2440-1BW40"},"ai":{"faq":[{"question":"What are the key dimensions of the 3RH2440-1BW40?","answer":"Height is 57.5 mm, width is 90 mm, depth is 73 mm — the S00 frame size that fits standard 35 mm DIN-rail mounting with snap-on fastening."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2440-1BW40","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/3RH2440-1BW40 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}}