{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2025-4KJ40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2025-4KJ40","canonicalUrl":"https://aoctrl.com/siemens/3RT2025-4KJ40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2025-4KJ40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling contactor, Size S0, 3RT2025-4KJ40, rated 17 A at 600 V, 14 A at 480 V, screw and snap-on DIN rail mounting.","salesMarkdown":"The 3RT2025-4KJ40 is a SIRIUS coupling contactor in Size S0, meaning it occupies the standard 45 mm width and 85 mm height footprint for this frame — the same panel cutout as other S0 contactors, so a swap into an existing S0 backpanel requires no drilling. The 107 mm depth is the dimension behind the panel face; verify clearance to the enclosure door or adjacent devices. The headline ratings are 17 A at 600 V and 14 A at 480 V — these are the maximum continuous currents the main poles can carry at those voltages in AC-1 duty (resistive load). For motor switching, the AC-3 rating governs; the evidence does not list an AC-3 current figure, so the 17 A / 14 A values apply to resistive or general-purpose loads, not to a motor full-load current. If you are switching a motor, the AC-3 rating from the datasheet (not in this record) is the one that decides the fit. The coil circuit is rated for 24 VDC at 10 A, 48 VDC at 2 A, and so on down the DC voltage table — these are the maximum switching currents for the DC coil circuit, not the main pole ratings. The coil connection uses a ring cable lug, so the wiring termination must accommodate that lug type. These are the minimum air gaps to grounded metal or adjacent devices for the rated insulation. The mechanical endurance of the contactor is typical 10,000,000 operations.","metaTitle":"Siemens 3RT2025-4KJ40 SIRIUS Coupling Contactor, Size S0, 60","metaDescription":"Siemens 3RT2025-4KJ40 SIRIUS coupling contactor, Size S0. Rated 17 A at 600 V AC. Current production stage. Screw and snap-on DIN rail mount. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Width":"45 mm","at DC":"19 ... 21 ms","title":"3RT2025-4KJ40","Height":"85 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":"power contactor, AC-3e/AC-3, 17 A, 7.5 kW / 400 V, 3-pole, 72 V DC, 0.7-1.25* Us, with plugged-in varistor, auxiliary contacts: 1 NO + 1 NC, ring cable lug connection, size: S0, suitable for PLC outputs, not expandable with auxiliary switch","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Ring cable lug connection","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":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting 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":"Coupling 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","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","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"1.8 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","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"35.2 A","at AC-5b up to 400 V rated value":"14.1 A","For Auxiliary And Control Circuit":"ring terminal lug connection","Function Module For 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":"4.5 W","closing power of magnet coil at DC":"4.5 W","holding power of magnet coil at DC":"4.5 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":"0.6 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","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","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 %","Type Of Voltage Of The Control Supply Voltage":"DC","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":"180 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"115 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"96 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","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)","minimum cross-section in main circuit at maximum AC-1 rated value":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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/3ed9e7cc1fdeefb31386dc6b08e5ff81.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=55230&mlfb=3RT2025-4KJ40"},"ai":{"faq":[{"question":"What are the key dimensions of 3RT2025-4KJ40?","answer":"Width 45 mm, height 85 mm, depth 107 mm. These match the standard Size S0 footprint."},{"question":"Will 3RT2025-4KJ40 drop into a panel specified around a Size S0 contactor?","answer":"Yes — the 45 mm width and 85 mm height are the S0 standard, so it fits the same DIN-rail cutout and backpanel layout. Verify the 107 mm depth clearance to the enclosure door or adjacent devices."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2025-4KJ40","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/3RT2025-4KJ40 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}}