{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1AG20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1AG20","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1AG20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AG20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S0, 3RT1025-1AG20, 7.5 kW AC-2 at 400 V, 15.5 A AC-4 at 400 V, screw terminals, 45 mm width, IP20 front.","salesMarkdown":"## Siemens SIRIUS 3RT1025-1AG20 Power Contactor — Size S0, Screw Terminals The Siemens 3RT1025-1AG20 is a SIRIUS power contactor in the compact Size S0 frame, rated for motor switching at 7.5 kW in AC-2 duty at 400 V and 15.5 A in AC-4 duty at 400 V — the AC-4 figure governs reversing or inching applications where the contactor makes and breaks the load under full current. Main circuit screw terminals accept solid or stranded conductors up to 2x 10 mm² (AWG 8), while auxiliary and control circuit terminals handle up to 2x 4 mm² (AWG 12) — sized for typical motor branch circuits without needing terminal adapters. ## Motor Duty Ratings & Short-Circuit Coordination Rated at 7.5 kW AC-2 at 400 V (slip-ring motor starting) and 11 kW at 690 V; the same contactor delivers 10 kW at 500 V and 11 kW at 690 V — the higher voltage ratings let it serve 690 V industrial networks common in mining or marine installations. Short-circuit coordination: Type 1 requires a 63 A gL/gG fuse; Type 2 requires 25 A gL/gG. The 25 A fuse limits let-through energy to protect the contactor during a bolted fault, keeping it operational after the event. Front face is IP20; terminal area is IP00 — install in a cabinet with at least IP2X door to meet touch-safe requirements. RoHS compliant per substance prohibitance date of 01.07.2006. Built-in auxiliary contacts rated: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V — these cover control-circuit switching for PLC inputs, pilot lights, and interposing relays across common control voltages.","metaTitle":"Siemens 3RT1025-1AG20 SIRIUS Power Contactor, Size S0, 7.5 k","metaDescription":"Siemens 3RT1025-1AG20 SIRIUS power contactor, Size S0, 7.5 kW AC-2 at 400 V, 15.5 A AC-4. Screw terminals, 45 mm wide, IP20 front. Active production, sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"91 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 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","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","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 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"110 V","at 500 V rated value":"10 kW","at 60 Hz rated value":"110 V","at 690 V rated value":"11 kW","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","Substance Prohibitance (Date)":"01.07.2006 00:00:00","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","reference code acc. to IEC 81346-2":"Q","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 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)","apparent holding power of magnet coil at AC":"8.4 V·A","apparent pick-up power of magnet coil at AC":"64 V·A","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","Inductive Power Factor With Closing Power Of The Coil":"0.72","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.24","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","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","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=117678&mlfb=3RT1025-1AG20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AG20/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1AG20","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/3RT1025-1AG20 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}}