{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-3BP40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-3BP40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-3BP40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BP40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1024-3BP40 power contactor, size S0, 5.5 kW at 400 V AC-2, 7.5 kW at 500/690 V, 24 V DC coil, screw-type terminals, IP20 front.","salesMarkdown":"## Motor ratings — what the duty classes mean The 3RT1024-3BP40: The headline motor-switching numbers: 5.5 kW at 400 V in AC-2 duty, and 7.5 kW at both 500 V and 690 V. AC-2 is the standard for slip-ring motors and moderate-load switching — it's less demanding than AC-4 (plugging/inching) but more than AC-3 (squirrel-cage starting). For AC-4 at 400 V, the contactor is rated 12.5 A, which translates to roughly 5.5 kW for reversing or jogging applications where the contacts break full-load current repeatedly. That means the PLC or relay driving it needs to supply the full 5.4 W continuously, not just a momentary inrush. The auxiliary contact ratings are given across several voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC — the DC switching capability drops sharply with voltage, which is typical for a contactor without arc chutes on the auxiliaries. ## Short-circuit coordination and protection This matters when you're coordinating with upstream motor protection — the 25 A Type 2 limit means you can't just throw a 40 A breaker ahead of it and call it done. Side-by-side mounting is allowed without derating — no gap required between contactors. Maximum altitude 2,000 m without derating. Front face is IP20 (finger-safe), terminals are IP00 (tool access only). ## Wiring and terminal capacity Main circuit terminals accept 2x (0.25 to 2.5 mm²) solid, or 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²) stranded, up to a maximum of 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), and 1x 8. The auxiliary contact block on the side has a 6 mm clearance requirement.","metaTitle":"Siemens 3RT1024-3BP40 SIRIUS Power Contactor, S0, 5.5 kW AC-","metaDescription":"Siemens 3RT1024-3BP40 SIRIUS power contactor, size S0, 5.5 kW at 400 V AC-2, 7.5 kW at 500/690 V. Screw terminals, 24 V DC coil. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"85 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"230 V","On The Front":"IP20","Initial Value":"0.8","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Full-scale value":"1.1","Size of contactor":"S0","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":"7.5 kW","at 690 V rated value":"7.5 kW","Instantaneous Contact":"0","Side-by-side mounting":"Yes","For Main Current Circuit":"screw-type terminals","Single Or Multi-Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","at AC-2 at 400 V rated value":"5.5 kW","at AC-4 at 400 V rated value":"12.5 A","Closing power of magnet coil at DC":"5.4 W","Holding power of magnet coil at DC":"5.4 W","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","at AWG conductors for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","Reference code acc. to DIN EN 81346-2":"Q","Number of NC contacts for main contacts":"0","Number of NO contacts for main contacts":"3","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"spring-loaded terminals","at ambient temperature 40 °C rated value":"40 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type of voltage of the control supply voltage":"DC","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","Of The Contactor With Added Electronics-Compatible 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=127127&mlfb=3RT1024-3BP40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BP40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"5.5 kW at 400 V AC-2, 7.5 kW at both 500 V and 690 V. For AC-4 duty at 400 V, the current rating is 12.5 A."},{"question":"What short-circuit protection does this contactor require?","answer":"For Type 2 coordination (no damage), use a gL/gG fuse rated 25 A. For Type 1 coordination (contactor may be damaged but installation safe), the fuse can be up to 63 A."},{"question":"What is the coil power consumption?","answer":"Both closing and holding power are 5.4 W DC — a single-wattage coil, not a two-stage economy design."},{"question":"What compliance documentation is available for this part?","answer":"The reference code per DIN EN 81346-2 is Q. The contactor carries pollution degree 3 rating and IP20 front protection. Specific RoHS/REACH/UL/IEC declarations should be verified against the Siemens documentation package for the serial number."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-3BP40","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/3RT1024-3BP40 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}}