{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BM40","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT1025-1BM40, size S0, 7.5 kW at 400 V AC-3, screw-type terminals, IP20 front, snap-on DIN rail mounting.","salesMarkdown":"That means it handles the inrush and breaking current of a motor up to that power without welding contacts or excessive wear. For more severe switching (AC-4, plugging or inching), it carries a 15.5 A rating at 400 V. The front face carries IP20 finger protection, so accidental contact during maintenance is prevented as long as the panel door is closed. This matters when designing the upstream protection — you size the fuse to clear a fault before the contactor welds shut. The coil is DC-operated with a closing and holding power of 5.4 W. That is a continuous-duty coil, so it stays energized without overheating — typical for applications where the contactor is held in for long periods. ## Integration Notes Width is 45 mm, side clearance 6 mm. Depth 101 mm, height 85 mm. The auxiliary contacts are rated for switching at various control voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. These ratings are for the auxiliary contact block, so if you are switching a PLC output or a relay coil, stay within these limits per the voltage you are using.","metaTitle":"Siemens 3RT1025-1BM40 SIRIUS Power Contactor, 7.5 kW at 400","metaDescription":"Siemens SIRIUS 3RT1025-1BM40 power contactor, size S0, 7.5 kW at 400 V AC-3, screw terminals, IP20 front, active production. RFQ for sourcing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 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","At The Side":"6 mm","Rated Value":"220 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 400 V rated value":"7.5 kW","at 500 V rated value":"10 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"0","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","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","operating current at AC-12 maximum":"10 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","Fastening Method Side-By-Side Mounting":"Yes","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)","at ambient temperature 40 °C rated value":"40 A","Type Of Voltage Of The Control Supply Voltage":"DC","operating current at AC-15 at 400 V rated value":"3 A","operational current at AC-15 at 230 V rated value":"6 A","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","Of The Contactor With Added Electronics-Compatible Auxiliary Switch Block Typical":"5 000 000","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12"}},"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=502830&mlfb=3RT1025-1BM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BM40/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RT1025-1BM40 accept?","answer":"The main circuit screw terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²). For stranded wire: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), and max 2x 10 mm². The auxiliary circuit terminals accept similar ranges."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BM40","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/3RT1025-1BM40 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}}