{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-3XF40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-3XF40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-3XF40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-3XF40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S0 frame, 110 VDC coil with varistor, screw terminals, 45 mm width, DIN-rail mount.","salesMarkdown":"The coil is rated 110 VDC and includes a built-in varistor surge suppressor, which suppresses the inductive kickback from the coil — no external suppression diode needed for DC switching. ## DC switching capacity — what the ratings mean For DC loads, the contactor's switching capacity depends on the operating voltage. At 24 VDC it handles 10 A; at 60 VDC it handles 2 A; at 110 VDC it handles 1 A; at 220 VDC it handles 0.3 A. These are the maximum continuous currents the main contacts can make and break at those voltages — the arc-quenching limits for DC, which is inherently harder than AC. Main circuit terminals are screw-type, accepting solid or stranded conductors: 2x (0.25–2.5 mm²), 2x (1–2.5 mm²), 2x (2.5–6 mm²), and up to 2x 10 mm². Clearance distances: 10 mm upwards, forwards, downwards, and at the side — keep these free for arc flash and cooling.","metaTitle":"Siemens SIRIUS 3RT1025-3XF40-0LA2 Power Contactor, 110 VDC C","metaDescription":"Siemens SIRIUS 3RT1025-3XF40-0LA2 power contactor, S0 frame, 110 VDC coil with varistor suppression. Rated 10 A at 24 VDC, 1 A at 110 VDC. Screw terminals, DIN-rail mount. Active p","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"119 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","At The Side":"10 mm","Rated Value":"110 V","Initial Value":"0.7","Type Of Voltage":"DC","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022","Full-Scale Value":"1.25","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","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":"3 hp","at 400 V rated value":"3 A","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 110/120 V rated value":"1 hp","at 200/208 V rated value":"5 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 hp","at 575/600 V rated value":"15 hp","Of Main Circuit Rated Value":"6 kV","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","Product Function Bus Communication":"No","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","closing power of magnet coil at DC":"6 W","holding power of magnet coil at DC":"5.4 W","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (24 ... 14)","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"No","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","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=61426&mlfb=3RT1025-3XF40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-3XF40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What are the key DC switching ratings?","answer":"At 24 VDC it switches 10 A; at 60 VDC it switches 2 A; at 110 VDC it switches 1 A; at 220 VDC it switches 0.3 A."},{"question":"Does it include a surge suppressor?","answer":"Yes, the contactor is fitted with a built-in varistor across the coil, suppressing the inductive voltage spike when the coil de-energizes."},{"question":"What is the mounting method?","answer":"Screw and snap-on mounting onto 35 mm DIN rail per DIN EN 50022. Side-by-side mounting is allowed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-3XF40-0LA2","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/3RT1025-3XF40-0LA2 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}}