{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1XF40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1XF40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1XF40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1XF40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1025-1XF40-0LA2, 110 V DC coil, screw terminals, 45 mm width, snap-on DIN rail.","salesMarkdown":"## Siemens SIRIUS 3RT1025-1XF40-0LA2 — 110 V DC Power Contactor, Size S0 The Siemens SIRIUS 3RT1025-1XF40-0LA2 is a size S0 power contactor with a 110 V DC coil, rated for switching motor loads up to 11 kW at 690 V or 15 hp at 575/600 V. The DC coil includes a built-in varistor surge suppressor, which clips the inductive kickback on dropout — no external free-wheel diode needed for this variant. The contactor measures 45 mm wide by 116 mm high by 101 mm deep, fitting a standard 35 mm DIN rail per EN 50022. Main circuit connections are screw-type terminals accepting solid or stranded wire: 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max. 2x (0.75...4 mm²) for the coil/auxiliary, and 2x (1...2.5 mm²), 2x (2.5...6 mm²), max. 2x 10 mm² for the main power circuit. AWG equivalents: 2x (16...12), 2x (14...10), 1x 8 for the main contacts. ## Switching Ratings and Duty The DC coil picks up at 70% of rated voltage (77 V minimum) and holds across the full 110 V DC nominal. Switching capacity varies by load voltage: 10 A at 24 V DC, 1 A at 110 V DC, 0.3 A at 220 V DC. For AC motor loads, the contactor is rated 15.5 A at AC-4 (400 V) for reversing or inching duty, and the AC-3 motor ratings are 3 A at 400 V, 10 kW at 500 V, 11 kW at 690 V. Motor horsepower ratings per NEMA: 1 hp at 110/120 V, 5 hp at 200/208 V and 220/230 V, 10 hp at 460/480 V, 15 hp at 575/600 V. These are the minimum air gaps for arc containment and heat dissipation — panel builders should respect them, especially when grouping multiple contactors side by side.","metaTitle":"Siemens 3RT1025-1XF40-0LA2 SIRIUS Power Contactor, 110 V DC","metaDescription":"Siemens SIRIUS power contactor 3RT1025-1XF40-0LA2, size S0, 110 V DC coil with varistor, 45 mm wide. Rated 11 kW at 690 V, 15 hp at 575/600 V. Screw terminals, snap-on DIN rail. Ac","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":"116 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","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting 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)":"01.05.2012 00:00:00","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type 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","reference code acc. to IEC 81346-2":"Q","Ambient Temperature During Operation":"-40 ... +70 °C","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 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)","Product Function Short Circuit Protection":"No","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","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","suitability for use safety-related switching OFF":"No","protection class IP on the front acc. to IEC 60529":"IP20","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=179142&mlfb=3RT1025-1XF40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1XF40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1025-1XF40-0LA2?","answer":"The closest peer in the SIRIUS family is the 3RT1015-1BB42, but it uses a 24 V DC coil and has different terminal arrangements. The 3RT1025-1XF40-0LA2 is a size S0 with a 110 V DC coil and varistor; the 3RT1015-1BB42 is a smaller frame size. They are not drop-in replacements without rewiring and checking coil voltage compatibility."},{"question":"Will 3RT1025-1XF40-0LA2 fit into a panel designed for 3RT1015-1BB42?","answer":"Not without mechanical adjustments. The 3RT1025-1XF40-0LA2 is size S0 (45 mm wide), while the 3RT1015-1BB42 is a smaller frame size. The DIN rail mounting is the same, but the width and terminal layout differ, so the panel cutout and wiring plan would need revision."},{"question":"What compliance documentation does Siemens provide for 3RT1025-1XF40-0LA2?","answer":"The part carries a substance prohibition date of 01.05.2012, indicating RoHS compliance. Siemens typically provides CE, UL, CSA, and IEC declarations for the SIRIUS contactor range; specific certificates are available on request with the order code."},{"question":"Where can I buy 3RT1025-1XF40-0LA2?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1XF40-0LA2","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/3RT1025-1XF40-0LA2 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}}