{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1AH04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1AH04","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1AH04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AH04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1025-1AH04 power contactor, size S0, 3 NO main contacts, 15.5 A AC-4 at 400 V, 7.5 kW AC-2, 11 kW at 690 V, screw terminals, DIN rail mount.","salesMarkdown":"The 3RT1025-1AH04: Three NO main contacts, zero NC. The AC-4 rating of 15.5 A at 400 V governs plugging and inching duty — the high-stress switching that wears contacts fastest. At 690 V it handles 11 kW, so it suits 400 V and 690 V distribution without a frame size jump. The AC-12 operating current of 10 A covers resistive loads like heater banks. Side-by-side mounting is permitted, so multiple contactors pack tightly on the rail without derating gaps. Accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid. For stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), or 1x 8. Standard panel-builder practice: keep the gland plate clearance for the 140 mm depth. This matters when the panel designer has already locked in a fuse size — the 25 A limit for Type 2 is the tighter constraint. ## Environmental range Maximum installation altitude is 2 000 m — above that, derate for air density. The coil holds at 24 V rated value drawing 10 A (inrush), dropping to lower hold values. At 60 V the rated current is 2 A; at 110 V it is 1 A; at 220 V it is 0.3 A.","metaTitle":"Siemens 3RT1025-1AH04 SIRIUS Power Contactor, S0, 3NO, 15.5A","metaDescription":"Siemens SIRIUS 3RT1025-1AH04 power contactor, size S0, 3 NO main contacts, 15.5 A AC-4 at 400 V, 7.5 kW AC-2, 11 kW at 690 V. Current lifecycle stage. Screw terminals, DIN rail mou","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"140 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","Maximum":"2 000 m","at 50 Hz":"0.8 ... 1.1","At The Side":"6 mm","On The Front":"IP20","1 Rated Value":"50 Hz","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Size of contactor":"S0","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":"48 V","at 500 V rated value":"10 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"2","Side-by-side mounting":"Yes","For Main Current Circuit":"screw-type terminals","Single Or Multi-Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","at AC-2 at 400 V rated value":"7.5 kW","at AC-4 at 400 V rated value":"15.5 A","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","at AWG conductors for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","Reference code acc. to DIN EN 81346-2":"Q","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","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","at ambient temperature 40 °C rated value":"40 A","Apparent holding power of magnet coil at AC":"7.8 V·A","Apparent pick-up power of magnet coil at AC":"61 V·A","Type of voltage of the control supply voltage":"AC","Inductive power factor with closing power of the coil":"0.82","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","Of The Contactor With Added Electronics-Compatible 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=450187&mlfb=3RT1025-1AH04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AH04/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"Three NO main contacts. AC-4 rating is 15.5 A at 400 V. AC-2 motor rating is 7.5 kW at 400 V. At 690 V it handles 11 kW. The AC-12 resistive rating is 10 A. Frame size S0, 45 mm wide."},{"question":"What is the mounting method?","answer":"Screw or snap-on mounting onto 35 mm DIN rail per EN 50022. Side-by-side mounting is allowed."},{"question":"What wire sizes does the screw terminal accept?","answer":"Solid: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². AWG: 2x (16 to 12), 2x (14 to 10), 1x 8."},{"question":"What fuse coordination is required?","answer":"Type 2 coordination requires a gL/gG 25 A fuse upstream. Type 1 coordination allows up to gL/gG 63 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1AH04","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/3RT1025-1AH04 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}}