{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1BW44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1BW44","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1BW44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BW44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1024-1BW44 power contactor, Size S0, 48 V DC coil, screw-type terminals, 7.5 kW at 500 V / 690 V AC-3, snap-on 35 mm DIN rail mount.","salesMarkdown":"The Siemens 3RT1024-1BW44 is a SIRIUS power contactor in the Size S0 frame, designed for switching three-phase motor loads up to 7.5 kW at both 500 V and 690 V AC-3 duty. The contactor snaps onto a 35 mm DIN rail per EN 50022 and uses screw-type terminals for the main circuit, accepting up to 2x 10 mm² or 1x AWG 8 conductors. The 45 mm width and 85 mm height on the Size S0 frame mean it occupies a single 45 mm module on the DIN rail — standard for a contactor this size, so it fits alongside a matching overload relay without overhanging the rail. Depth of 150 mm includes the coil terminals and arc chamber; allow clearance for the screwdriver swing when terminating. Side-by-side mounting is permitted with 6 mm spacing to adjacent devices, which keeps the panel layout dense but still serviceable. The DC coil draws a constant 5.4 W whether closing or holding, so the thermal load on the enclosure is predictable — no inrush spike to derate for. At 48 V, the pickup voltage is typically 0.8 x nominal (38.4 V), and dropout occurs around 0.1 x nominal (4.8 V), giving a wide hold-in range against dips on a DC bus. For DC switching applications, the 3RT1024-1BW44 is rated 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are resistive-load values (DC-1). If switching inductive DC loads, derate further or add a free-wheeling diode across the load; the contactor's own coil suppression is internal, but the main contacts need external protection. ## Motor duty and coordination At 400 V AC-3, the contactor switches motor loads up to 7.5 kW — the same power rating as at 500 V and 690 V, so the limiting factor is current, not voltage, above 400 V. For reversing or plugging duty (AC-4 at 400 V), the rated operational current is 12.5 A, which is about half the AC-3 current; this reflects the higher arc stress during inching and reversing cycles. Type 2 coordination requires a 25 A gL/gG fuse; Type 1 coordination allows a 63 A fuse, giving flexibility depending on whether downstream damage tolerance is acceptable. ## Environmental and installation limits","metaTitle":"Siemens 3RT1024-1BW44 SIRIUS Power Contactor, Size S0, 7.5 k","metaDescription":"Siemens SIRIUS 3RT1024-1BW44 power contactor, Size S0 frame, rated 7.5 kW at 500/690 V AC-3. Screw terminals, DC coil 48 V, snap-on DIN rail mount. Current lifecycle stage, sourced","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":"48 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=418154&mlfb=3RT1024-1BW44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BW44/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"At AC-3 duty, it switches 7.5 kW at 400 V, 500 V, and 690 V. For reversing duty (AC-4 at 400 V), the rated operational current is 12.5 A. The DC coil is 48 V nominal, drawing 5.4 W."},{"question":"What is the physical size and mounting?","answer":"The Size S0 frame measures 45 mm wide, 85 mm high, and 150 mm deep. It snaps onto a 35 mm DIN rail per EN 50022 and allows side-by-side mounting with 6 mm spacing."},{"question":"What conductor sizes does the screw terminal accept?","answer":"Main circuit terminals accept 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), max. 2x (0.75–4 mm²) for solid/stranded, or 2x (1–2.5 mm²), 2x (2.5–6 mm²), max. 2x 10 mm² for single/multi-stranded. AWG equivalents: 2x (16–12), 2x (14–10), 1x 8."},{"question":"Does this contactor drop into a panel wired for a 3RT1015-1BB42?","answer":"The 3RT1024-1BW44 is a Size S0 frame with screw terminals and a 48 V DC coil, while the 3RT1015-1BB42 is a smaller Size S00 frame. The physical footprint and terminal layout differ — the S0 is 45 mm wide versus S00 at 22.5 mm, so it will not fit the same DIN-rail space without relocating adjacent devices. Rewiring is required due to different terminal positions and conductor capacity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1BW44","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/3RT1024-1BW44 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}}