{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1BF44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1BF44","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1BF44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BF44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S0 frame, 110 VDC coil, screw terminals, 45 mm wide, 85 mm high, 150 mm deep.","salesMarkdown":"The 110 VDC coil pulls 5.4 W on close and hold, which matters when sizing a DC supply shared across a row of contactors — that draw is constant, not a spike. Rated at 5.5 kW in AC-2 duty at 400 V, this contactor handles wound-rotor motor starts where the current stays moderate through the acceleration. For plugging or inching duty (AC-4), it's rated 12.5 A at 400 V — that's the number to check if your application reverses or jogs the load frequently. The AC-1 resistive rating isn't listed here, so don't assume it for heater banks; stick to the motor-duty figures. The auxiliary contact block carries 2 instantaneous N/O contacts rated 10 A at 24 V, 6 A at 230 V, and 1 A at 110 V DC. That covers feedback to a PLC or holding-circuit interlock, but if you need more than two auxiliary poles, you'll add a side-mount block — the S0 frame accepts them. Main circuit terminals accept 2x (1 to 2.5 mm²) stranded or 2x (2.5 to 6 mm²), up to 2x 10 mm² max. The auxiliary/control terminals take 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). That's enough for standard panel wire up to about 8 AWG on the mains and 14 AWG on the coil circuit. Screw terminals, not spring-cage — factor in the extra termination time if your shop standard is push-in. Short-circuit coordination: with Type 1 coordination, use a 63 A gL/gG fuse upstream. For Type 2 (no damage to the contactor after a fault), drop to a 25 A gL/gG fuse. That's a real difference in fuse sizing — if your panel spec calls for Type 2, the 25 A limit may force a larger feeder breaker than you'd otherwise run. ## Physical fit Dimensions: 45 mm wide, 85 mm high, 150 mm deep. Protection: IP20 on the front (finger-safe), IP00 at the terminals. That's normal for a panel-mounted contactor — the terminals are live when the cover is off, so standard warning labels apply. No washdown rating; keep it inside the enclosure.","metaTitle":"Siemens 3RT1024-1BF44 SIRIUS Power Contactor, S0, 110 VDC Co","metaDescription":"Siemens 3RT1024-1BF44 SIRIUS power contactor, S0 frame, 110 VDC coil, 5.5 kW AC-2 at 400 V, 12.5 A AC-4. Current lifecycle. Quoted to order against RFQ.","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":"110 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=276409&mlfb=3RT1024-1BF44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BF44/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1024-1BF44?","answer":"The 3RT1023-1AL20 is a close sibling in the same S0 frame, but it uses a 230 V AC coil instead of 110 V DC. The mechanical footprint and terminal layout are identical, so it drops into the same panel without rewiring — just swap the coil supply voltage. The AC-2 and AC-4 ratings are similar but not identical; verify the motor current against the 3RT1023-1AL20's nameplate before substituting."},{"question":"What compliance documentation does Siemens provide for 3RT1024-1BF44?","answer":"As a SIRIUS series component, it carries CE marking for the European market and is designed to meet IEC 60947-4-1 for contactors. RoHS and REACH declarations are available from Siemens on request. UL and CSA listings are typical for this series but should be confirmed against the specific variant's nameplate markings."},{"question":"Where can I buy 3RT1024-1BF44 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1BF44","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/3RT1024-1BF44 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}}