{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2025-4XJ40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2025-4XJ40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2025-4XJ40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2025-4XJ40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2025-4XJ40-0LA2, size S0, 72 V DC coil, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"The DC coil pulls in reliably at 72 V nominal, with an operating time of 30 to 50 ms on DC and an arcing time of 10 ms — fast enough for most motor start/stop sequences but not for high-speed inverter bypass applications. Rated for AC-3 duty at 1 000 switching cycles per hour maximum, and 300 cycles per hour under AC-4 (plugging/reversing) duty. The S0 footprint measures 45 mm wide, 91 mm tall, and 107 mm deep — a standard slot that fits alongside other S0 accessories (overload relays, terminal blocks) without crowding. The magnet coil connection uses ring cable lugs, so plan for ring terminals on the control wiring — not fork or pin terminals. The built-in auxiliary switch is rated for DC switching at several voltage levels: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V. For AC auxiliary loads: 3 A at 400 V, 0.6 A at 440 V, 14 A at 480 V, 2 A at 500 V. The 14 A at 480 V rating is unusually high — that's the AC-15 pilot-duty capability for the auxiliary contacts, meaning they can drive multiple contactor coils or indicator lamps in parallel without derating. The main contactor is rated for 3 hp at 230 V — that's the motor full-load current the contacts can make and break under AC-3 duty. For a 230 V three-phase motor, that covers up to about a 3 hp (2.2 kW) load. At 480 V the auxiliary contacts handle 14 A, but the main contactor's motor rating at 480 V is not listed in this data set — verify the full AC-3 current rating from the nameplate or datasheet before committing the BOM line.","metaTitle":"Siemens 3RT2025-4XJ40-0LA2 SIRIUS Power Contactor, 72 V DC C","metaDescription":"Siemens SIRIUS 3RT2025-4XJ40-0LA2 power contactor, size S0, 72 V DC coil, 3 hp at 230 V. Current lifecycle stage. DIN rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Width":"45 mm","at DC":"30 ... 50 ms","title":"3RT2025-4XJ40-0LA2","Height":"91 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"72 V","description":"traction contactor, AC-3e/AC-3, 17 A, 7.5 kW / 400 V, 3-pole, 72 V DC, 0.7-1.25* Us, electronic drive, with integrated varistor, auxiliary contacts: 1 NO + 1 NC, ring cable lug connection, size: S0","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Ring cable lug connection","Type Of Voltage":"DC","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"1 000 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.25","at AC-3e maximum":"1 000 1/h","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S0","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"3 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"14 A","at 500 V rated value":"2 A","at 600 V rated value":"17 A","at 690 V rated value":"1 A","Design Of The Product":"With extended operating range","Instantaneous Contact":"1","Side-By-Side Mounting":"Yes","For Main Current Circuit":"Ring cable lug connection","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 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","at AC-2 at AC-3e maximum":"1 000 1/h","Relative Humidity Minimum":"10 %","at maximum Ith rated value":"10 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"10 mm²","at AC in hot operating state":"2.7 W","at AC-2 at 400 V rated value":"7.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Duration Of Locked-Rotor Current":"180 ms","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"ring terminal lug connection","Function Module For Communication":"No","Product Function Bus Communication":"No","With Type Of Assignment 2 Required":"gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)","Without Load Current Share Typical":"1.6 W","closing power of magnet coil at DC":"13.2 W","holding power of magnet coil at DC":"1.3 W","At Contactor For Auxiliary Contacts":"Ring cable lug connection","With Type Of Coordination 1 Required":"gG: 63A (690V,100kA), aM: 32A (690V,100kA), BS88: 63A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"0.9 W","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"No","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"DC","up to 40 °C according to IEC 60077 rated value":"40 A","up to 70 °C according to IEC 60077 rated value":"30 A","Limited To 1 S Switching At Zero Current Maximum":"225 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"225 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"189 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"140 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"115 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / Q600","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":"gG: 10 A (500 V, 1 kA)","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b0c631b53857a4f273a31f4ac1f40002.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=114131&mlfb=3RT2025-4XJ40-0LA2"},"ai":{"faq":[{"question":"What is the closest functional second-source to this contactor?","answer":"The closest peer within the same SIRIUS S0 family is 3RT2025-1AD20-1AA0, which carries a 24 V DC coil instead of 72 V DC. The mechanical footprint (45 mm width, DIN rail mount, S0 frame) is identical, so it drops into the same panel layout without rewiring the power circuit. The coil voltage is the deciding factor — if your control voltage is 24 V DC, the -1AD20 variant is a direct swap; if it's 72 V DC, stick with this order code."},{"question":"What are the key dimensions for panel layout?","answer":"Width 45 mm, height 91 mm, depth 107 mm. Clearance: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the sides."},{"question":"Will this contactor drop into a panel designed for 3RT2025-1AD20-1AA0 without rewiring?","answer":"Yes, mechanically — both are S0 size with the same 45 mm width and DIN rail mounting. The power terminals are in the same locations. The difference is the coil voltage: this unit requires 72 V DC, while the -1AD20 uses 24 V DC. If the panel's control transformer and wiring are already sized for 72 V DC, no rewiring is needed. If the panel runs on 24 V DC control, you would need to change the coil supply circuit."},{"question":"What compliance documentation is available for this part?","answer":"The evidence does not list specific certifications (UL, CSA, CE, RoHS) for this order code. As a standard Siemens SIRIUS product, it typically carries CE marking for the European market and may have UL/CSA listings depending on the specific variant. Verify the nameplate markings or request the declaration of conformity from your Siemens channel partner before finalizing the BOM."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2025-4XJ40-0LA2","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/3RT2025-4XJ40-0LA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}