{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1BD44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1BD44","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1BD44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BD44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 42 VDC coil, screw terminals, 12.5 A AC-4 at 400 V, IP20 front.","salesMarkdown":"## What this SIRIUS S0 contactor does in a panel The 42 VDC coil pulls in at 5.4 W and holds at the same 5.4 W — no power drop after pick-up, so the DC supply needs to sustain that continuously. Rated for AC-4 duty at 12.5 A on 400 V, meaning it handles reversing or inching (plugging) of squirrel-cage motors at that current, which is the punishing switching condition. The AC-12 rating of 10 A covers control-circuit loads like PLC outputs or relay coils. Side-by-side mounting is allowed with zero side clearance — the 45 mm width per pole stacks tight. The mechanical life is 10 million switching cycles. Two instantaneous auxiliary contacts are built in (no separate aux block needed for basic signaling).","metaTitle":"Siemens 3RT1024-1BD44 SIRIUS Power Contactor, S0, 42 VDC coi","metaDescription":"Siemens SIRIUS power contactor 3RT1024-1BD44, size S0, 42 VDC coil, rated 12.5 A AC-4 at 400 V. Active production, screw terminals, DIN rail mount. Source to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"150 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","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"42 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":"2","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","at ambient temperature 40 °C rated value":"40 A","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=386688&mlfb=3RT1024-1BD44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BD44/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"AC-4 at 400 V: 12.5 A. AC-2 at 400 V: 5.5 kW. AC-12: 10 A. Coil: 42 VDC, 5.4 W pick-up and hold. Mechanical life: 10 million cycles."},{"question":"What mounting and clearance does it need?","answer":"Snap-on or screw mount onto 35 mm DIN rail per EN 50022. Side-by-side mounting allowed with zero side gap. Width is 45 mm, depth 150 mm, height 85 mm."},{"question":"What fuse coordination is specified?","answer":"Type 2 coordination requires a gL/gG 25 A fuse upstream. Type 1 coordination allows up to 63 A gL/gG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1BD44","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/3RT1024-1BD44 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}}