{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2026-2BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2026-2BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT2026-2BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2026-2BW40 power contactor, size S0, 48 VDC coil, spring-type terminals, screw and snap-on mounting for 35 mm DIN rail.","salesMarkdown":"Spring-type terminals on the magnet coil accept solid or stranded wire from 1 to 10 mm², and dual-wire entry (2x 0.5 to 2.5 mm²) is supported for daisy-chaining control wiring. This saves a terminal block row in dense panels. At 400 V, it switches 3 A, suitable for smaller three-phase motors or resistive heater banks. DC switching capability at 48 V is 2 A, which matters if you're breaking DC control circuits or small DC motor loads — the arc extinguishes differently than AC, so this rating is the one to check for DC applications. Maximum mechanical life is 10 million operations, with electrical life depending on load category: 1000 cycles/hour at AC-1 (resistive), 750 at AC-3 (motor running), and 250 at AC-4 (plugging/inching). Arcing time is 10 ms, and DC operating time (pull-in/drop-out) is 15 to 17.5 ms — fast enough for most sequencing but worth noting if your safety circuit requires a specific break time. ## Panel Integration and Clearance Dimensions are 45 mm wide, 102 mm high, and 107 mm deep — the S0 frame fits in a standard 45 mm slot on the DIN rail, leaving room for adjacent contactors or overload relays. These ensure proper ventilation and wiring access; skimping on side clearance when mounting multiple contactors side-by-side can trap heat. This helps when fitting into angled sub-panels or tight enclosures where a flat vertical mount isn't possible. This covers most indoor industrial environments; for outdoor cabinets in direct sun, verify the internal enclosure temperature stays under 60 °C.","metaTitle":"Siemens 3RT2026-2BW40 SIRIUS Power Contactor, S0 Size, 48 VD","metaDescription":"Siemens 3RT2026-2BW40 SIRIUS power contactor, size S0, 48 VDC coil, spring-type terminals. Rated for motor loads up to 3 hp at 230 V. Current production. Ships from stock.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at DC":"15 ... 17.5 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"48 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","For Main Contacts":"18 ... 8","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":"S0","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"3 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"21 A","at 500 V rated value":"2 A","at 600 V rated value":"22 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at 575/600 V rated value":"20 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"5.7 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"15.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","at AWG cables for main contacts":"2x (18 ... 8)","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"35.2 A","at AC-5b up to 400 V rated value":"20.7 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 35A (690V, 100kA), aM: 20A (690V, 100kA), BS88: 35A (415V, 80kA)","Without Load Current Share Typical":"5.9 W","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"5.9 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 100 A (690 V, 100 kA), aM: 50 A (690 V, 100 kA), BS88: 100 A (415 V, 80 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"1.9 W","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes","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 %","Type Of Voltage Of The Control Supply Voltage":"DC","Limited To 1 S Switching At Zero Current Maximum":"375 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"299 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"200 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"128 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"106 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e95ed991fff0a53598a61418797f249d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=237353&mlfb=3RT2026-2BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel fit?","answer":"Width is 45 mm, height 102 mm, depth 107 mm. Required clearances: 10 mm up, 10 mm down, 10 mm forward, 6 mm at sides."},{"question":"What wire sizes does the spring terminal accept?","answer":"Solid or stranded wire from 1 to 10 mm². Dual-wire entry accepts 2x 0.5 to 2.5 mm² for looping control wiring."},{"question":"What is the DC switching capacity at 48 V?","answer":"Rated at 2 A at 48 V DC. This is the figure to use when switching DC loads — AC ratings don't apply."},{"question":"Does it include an auxiliary switch?","answer":"Yes, an auxiliary switch is built in, providing feedback for status indication or interlocking circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2026-2BW40","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/3RT2026-2BW40 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}}