{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1026-1BB40, 24 V DC coil, 5.4 W, AC-2 11 kW at 400 V, AC-4 15.5 A, IP20 front, screw terminals, 45 x 85 x 101 mm.","salesMarkdown":"## SIRIUS S0 Power Contactor, 24 V DC Coil The Siemens 3RT1026-1BB40 is a SIRIUS S0 power contactor with a 24 V DC coil drawing 5.4 W during both closing and holding, so the coil driver sees a constant load — no inrush peak to design around. It switches motor loads in AC-2 duty up to 11 kW at 400 V (per) and handles AC-4 reversing or inching at 15.5 A at 400 V (per). The IP20 front enclosure keeps live parts behind the panel door; the terminal area is rated IP00, meaning the wiring compartment expects enclosure protection from the cabinet. Screw-type terminals on both the main current circuit and the auxiliary/control circuit. Main terminals accept 2x (1... 2.5 mm²) solid or stranded, 2x (2.5... 6 mm²), or max 2x 10 mm²; auxiliary terminals accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or max 2x (0.75... 4 mm²). AWG equivalents for main are 2x (16... 12), 2x (14... 10), 1x 8; for auxiliary, 2x (20... 16), 2x (18... 14), 1x 12. These ranges cover standard panel wire sizes without needing ferrules, though ferruled stranded is fine. These are the manufacturer's specified limits — the panel designer sizes the branch protection accordingly. The AC-12 maximum operational current is 10 A, which governs resistive load switching on the auxiliary contacts. The auxiliary contact block (integrated or add-on) is rated for DC switching at 24 V: 10 A; 60 V: 2 A; 110 V: 1 A; 220 V: 0.3 A. AC ratings at 230 V: 6 A; 400 V: 3 A; 500 V: 11 kW; 690 V: 11 kW. These are the contact ratings, not the coil — the coil is fixed at 24 V DC.","metaTitle":"Siemens 3RT1026-1BB40 SIRIUS S0 Power Contactor, 24 V DC Coi","metaDescription":"Siemens 3RT1026-1BB40 SIRIUS S0 power contactor, 24 V DC coil, 5.4 W, AC-2 11 kW at 400 V, AC-4 15.5 A, IP20 front, screw terminals, current production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"45 mm","Height":"85 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.8","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.1","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"11 kW","at 690 V rated value":"11 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"11 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 35 A","closing power of magnet coil at DC":"5.4 W","holding power of magnet coil at DC":"5.4 W","reference code acc. to IEC 81346-2":"Q","With Type Of Coordination 1 Required":"fuse gL/gG: 100 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","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)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","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=456537&mlfb=3RT1026-1BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BB40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT1026-1BB40?","answer":"The depth is 101 mm, with a width of 45 mm and height of 85 mm."},{"question":"What wire sizes does 3RT1026-1BB40 accept?","answer":"Main terminals accept 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), or max 2x 10 mm² solid/stranded. Auxiliary terminals accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or max 2x (0.75... 4 mm²). AWG equivalents are listed in the spec table."},{"question":"Will 3RT1026-1BB40 drop into a panel specified for 3RT1026-1AB00?","answer":"Yes, the mechanical footprint is identical — same S0 frame, same 45 mm width, same DIN rail mounting. The only difference is the coil voltage: the -1BB40 requires 24 V DC, while the -1AB00 uses an AC coil. If the panel's control transformer supplies 24 V DC, it's a direct swap; if it supplies AC, you need the -1AB00 or a separate DC power supply."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1BB40","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/3RT1026-1BB40 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}}