{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BB44-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BB44-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BB44-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BB44-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1025-1BB44-1AA0, size S0, 24 VDC coil, screw-type terminals, IP20 front, for motor switching and general load control.","salesMarkdown":"Its S0 frame size (45 mm width, 85 mm height, 150 mm depth) leaves room for adjacent devices on the rail. ## Electrical Ratings and Duty Rated coil voltage is 24 VDC, with a closing and holding power of 5.4 W. The coil operates between 0.8 × and 1.1 × the rated value, so it pulls in reliably down to about 19.2 V and holds through supply dips up to 26.4 V. For main circuit switching, the AC-12 operational current is 10 A maximum. Motor-duty ratings include 7.5 kW at AC-2 / 400 V and 15.5 A at AC-4 / 400 V. At 690 V, it handles 11 kW, making it suitable for 400 V and 690 V motor circuits. Auxiliary and control circuits use screw-type terminals accepting 2×(0.5…1.5 mm²) solid or 2×(0.75…2.5 mm²) stranded, with a maximum of 2×(0.75…4 mm²). Main circuit terminals accept up to 2×(2.5…6 mm²) stranded or 1×10 mm². ## Protection and Coordination The contactor carries IP20 on the front (finger-safe) and IP00 at the terminals, so it requires enclosure protection for the wiring zone. For type 2 coordination, a gL/gG fuse rated 25 A is required; for type 1 coordination, a 63 A gL/gG fuse.","metaTitle":"Siemens 3RT1025-1BB44-1AA0 SIRIUS Power Contactor, 24 VDC, S","metaDescription":"Siemens 3RT1025-1BB44-1AA0 SIRIUS power contactor, size S0, 24 VDC coil, 10 A at AC-12, screw terminals, IP20 front. Active production, sourced to order. Request 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","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.8","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.1","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","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","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"7.5 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","closing power of magnet coil at DC":"5.4 W","holding power of magnet coil at DC":"5.4 W","reference code acc. to IEC 81346-2":"Q","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","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","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","number of NC contacts for auxiliary contacts instantaneous contact":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized 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=50998&mlfb=3RT1025-1BB44-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BB44-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for the 3RT1025-1BB44-1AA0?","answer":"The 3RT1016-1BB42 is a smaller-frame sibling (size S00 vs S0) with a 24 VDC coil, but it has lower motor ratings and a different footprint. The 3RT1026-1AB00 is a larger-frame S0 variant with an AC coil. Neither is a direct drop-in without rewiring or panel rework."},{"question":"How do I get current pricing and availability for the 3RT1025-1BB44-1AA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for the 3RT1025-1BB44-1AA0?","answer":"The part carries a RoHS compliance date of 01.07.2006, confirming compliance with the original RoHS directive. Siemens typically provides a Declaration of Conformity covering IEC/EN 60947-4-1 for power contactors; request this from your distributor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BB44-1AA0","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/3RT1025-1BB44-1AA0 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}}