{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BD44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BD44","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BD44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BD44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1025-1BD44, S0 frame, 7.5 kW at AC-2 400 V, 24 VDC coil, screw-type terminals, 45 mm width.","salesMarkdown":"## Siemens 3RT1025-1BD44 SIRIUS S0 Power Contactor — 7.5 kW AC-2, 24 VDC Coil At 45 mm wide, it fits standard S0 panel layout — one slot in a multi-contactor grouping. Short-circuit protection depends on your coordination choice. With Type 1 coordination, a gL/gG 63 A fuse clears a fault without destroying the contactor — you replace the fuse and keep running. With Type 2 coordination, the 25 A gL/gG fuse limits damage to the contactor itself, so you swap both fuse and contactor after a fault. Pick the fuse to match your maintenance philosophy. The contactor carries an IP20 finger-safe enclosure on the front; the terminals themselves are IP00 — wire into a panel with covers in place. ## Wiring and Terminal Capacity Main current circuit terminals accept screw-type connections: 2x (1 to 2.5 mm²) stranded, 2x (2.5 to 6 mm²), or up to 1x 10 mm² solid. The auxiliary contact block terminals handle 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²), max 2x 4 mm². Strip lengths and torque values follow standard Siemens S0 practice — no oddball termination. Side-by-side mounting is permitted — no spacing gap required, which keeps panel width tight. ## Auxiliary Contact Load Ratings The built-in auxiliary contact (1 NO + 1 NC, instantaneous) has a rated operational current of 10 A at AC-12 (resistive). For DC switching, the ratings drop with voltage: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. That 0.3 A at 220 VDC is the limit for a DC coil or indicator lamp — do not parallel loads that exceed it. This is an active, current-production Siemens SIRIUS part. No last-time-buy window to chase.","metaTitle":"Siemens 3RT1025-1BD44 SIRIUS Power Contactor, 7.5 kW AC-2, 4","metaDescription":"Siemens 3RT1025-1BD44 SIRIUS S0 power contactor, 7.5 kW at AC-2 400 V, 15.5 A at AC-4 400 V. 24 VDC coil, screw terminals, DIN rail mount. Active production, sourced 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":"10 kW","at 690 V rated value":"11 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":"7.5 kW","at AC-4 at 400 V rated value":"15.5 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=82635&mlfb=3RT1025-1BD44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BD44/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1025-1BD44?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional second-source for 3RT1025-1BD44?","answer":"The 3RT1023-1AL20 is a smaller S0 frame contactor (lower AC-2 power rating) that shares the same 24 VDC coil voltage and DIN rail footprint, but it cannot match the 7.5 kW AC-2 rating of the 3RT1025-1BD44 — verify your motor load before substituting."},{"question":"Will 3RT1025-1BD44 drop into a panel specified around 3RT1023-1AL20 without rewiring?","answer":"Yes, both are S0 frame size on 45 mm width with the same DIN rail mounting and screw terminal pattern, but the 3RT1025-1BD44 draws a higher coil inrush — verify your 24 VDC power supply can handle the 5.4 W closing power."},{"question":"What compliance documentation does Siemens provide for 3RT1025-1BD44?","answer":"Siemens SIRIUS contactors carry CE marking for the European market and are designed to meet IEC/EN 60947-4-1. RoHS and REACH declarations are available from Siemens Industry Support; UL/CSA listing varies by coil voltage — verify with the factory for the 24 VDC variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BD44","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/3RT1025-1BD44 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}}