{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BA40","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1025-1BA40, size S0, 12 V DC coil, screw terminals, 45 mm width, for motor switching up to 11 kW at 690 V.","salesMarkdown":"## 12 V DC coil, S0 frame — panel fit and motor duty The 12 V DC coil draws 5.4 W during both closing and holding, so the control transformer or DC supply needs to sustain that continuous draw without sagging. Rated motor power hits 7.5 kW at 400 V, 10 kW at 500 V, and 11 kW at 690 V — the 690 V figure is the ceiling for a 400 V line motor; the contactor itself handles the higher voltage. Mounting is screw-and-snap onto 35 mm DIN rail per EN 50022, 45 mm wide, 85 mm tall, 101 mm deep. The side clearance for derating is 6 mm. IP20 on the front, IP00 at the terminals — meaning the terminal area needs enclosure protection against accidental contact. ## Coordination and wiring — what the fuse ratings tell you These are the factory-recommended maximums; your panel designer's SCCR study may set a lower limit. Main circuit terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid/stranded — the larger wire sizes are for the main power path, not the coil. Auxiliary and control circuit terminals are also screw-type, same wire range. The contactor carries zero NC contacts on the main poles — all auxiliary contacts are on the side-mounted blocks if ordered separately. Coil suppression is not built in; add a free-wheeling diode across the 12 V DC coil to protect the PLC output driving it.","metaTitle":"Siemens 3RT1025-1BA40 SIRIUS Power Contactor, 12 V DC Coil","metaDescription":"Siemens 3RT1025-1BA40 SIRIUS power contactor, 12 V DC coil, S0 size, 45 mm wide. Active production. Sourced to order against RFQ.","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":"12 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 400 V rated value":"7.5 kW","at 500 V rated value":"10 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"0","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","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","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)","at ambient temperature 40 °C rated value":"40 A","Type Of Voltage Of The Control Supply Voltage":"DC","operational current at AC-15 at 230 V rated value":"6 A","operational current at AC-15 at 400 V rated value":"3 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","type of connectable conductor cross-sections at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","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=261703&mlfb=3RT1025-1BA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BA40/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BA40","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/3RT1025-1BA40 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}}