{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2026-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2026-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RT2026-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2026-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2026-1BD40 power contactor, Size S0, 42 V 50/60 Hz coil, screw terminals, 3 hp at 230 V, 10 A at 24 V DC.","salesMarkdown":"The coil holds at 42 V nominal; the operating range spans 0.8 to 1.1 times the rated value. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward and backward — enough flexibility to fit tight enclosures without derating. ## Switching Capacity and Duty Ratings For motor starting (AC-3 duty), the contactor is rated for 3 hp at 230 V — that's the headline number for a 3-phase motor on a 230 V line. At 400 V, the AC-3 rating is 3 A, so it handles smaller motors at higher line voltages. DC switching is specified per voltage step: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V. These are resistive-load ratings (AC-1 equivalent); inductive DC loads need derating or arc-suppression across the contacts. Mechanical switching frequency limits vary by duty: 1 000 cycles/hour for AC-1 (resistive), 750 cycles/hour for AC-2 and AC-3 (motor start/run), and 250 cycles/hour for AC-4 (plugging/inching). The arcing time sits at 10 ms, typical for a Size S0 contactor. The closest functional peer is the 3RT2026-1FB44-3MA0, which carries a different coil voltage but shares the same Size S0 frame and screw-terminal layout. ## Integration and Clearance Dimensions: 85 mm height, 45 mm width, 107 mm depth. These are for ventilation and arc-quenching — stacking contactors closer than that requires thermal derating. Wire range: solid or stranded 1 to 10 mm² for the main power circuit, and 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) for auxiliary/control wiring. Screw terminals are standard; torque values follow the manufacturer's tightening spec on the terminal face. ## Environmental and Mechanical Life The storage limit governs handling during shipping and off-season storage, not running conditions. Electrical life depends on switching current and duty cycle; for AC-3 at rated current, expect roughly 1 to 2 million operations. An auxiliary switch is built into the contactor (yes/no flag indicates yes), so no separate add-on block is needed for basic status feedback to the PLC or indicator lamp.","metaTitle":"Siemens SIRIUS 3RT2026-1BD40 Power Contactor, Size S0, 42 V","metaDescription":"Siemens SIRIUS 3RT2026-1BD40 power contactor, Size S0 frame, 42 V 50/60 Hz coil. Screw terminals, 3 hp at 230 V, 10 A at 24 V DC. Active production. DIN rail mount. RFQ for current","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 ... 18 ms","Height":"85 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":"42 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-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 DIN rail according to DIN EN 60715","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","For Main Contacts":"16 ... 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 ... 1.5 mm²), 2x (0.75 ... 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":"screw-type 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-2 at 400 V rated value":"11 kW","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","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":"screw-type 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":"Screw-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)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"1.9 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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), 2x (0.75 ... 2.5 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 %","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":"300 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"210 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"144 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"118 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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=366648&mlfb=3RT2026-1BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2026-1BD40/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RT2026-1BD40 accept?","answer":"Solid or stranded wire from 1 to 10 mm² for the main power circuit. For auxiliary/control wiring, it accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). Terminals are screw-type."},{"question":"Will the 3RT2026-1BD40 drop into a panel specified around the 3RT2026-1FB44-3MA0 without rewiring?","answer":"Yes, mechanically and electrically for the power circuit. Both are Size S0 with screw terminals and identical mounting footprint. The only change is the coil voltage — the -1BD40 uses a 42 V coil, so the control transformer tap or supply must match."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2026-1BD40","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/3RT2026-1BD40 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}}