{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7045-1AH00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7045-1AH00","canonicalUrl":"https://aoctrl.com/siemens/3RT7045-1AH00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7045-1AH00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 contactor, 3RT7045-1AH00, 3-pole, AC-3 rated 690 V, screw-type terminals, IP20 front, active production.","salesMarkdown":"The three normally-open main contacts handle the power circuit; there are no NC main contacts on this variant. Mounting is flexible: screw-fix or snap onto a 35 mm or 75 mm standard mounting rail. Front protection is IP20 — safe against finger contact when installed in an enclosure. The terminal area is rated IP00, meaning the connection points are not touch-protected on their own; the panel enclosure provides the required safeguarding. The AC-3 maximum switching frequency is 800 operations per hour; for AC-4 (plugging/inching) duty it drops to 250 operations per hour. That tells you this contactor is designed for normal motor starting cycles, not for high-speed jogging applications. If your application needs frequent reversing or inching, the AC-4 limit governs the real duty cycle. Auxiliary contacts are rated for PLC-level reliability — the spec calls out acceptability for PLC control at 17 V, 5 mA. That means the silver-alloy contacts are designed to switch low-energy signals without oxidation problems, so you can wire the auxiliary block directly to a 24 VDC digital input card without worrying about contact wetting current. The coil is AC-operated with a closing power of 0.61 W DC equivalent and a holding power of 0.26 W DC equivalent. These are low enough to keep control transformer sizing modest in a multi-contactor panel. For type 1 coordination (no-weld-after-fault), the spec calls for a gL/gG NH 3NA fuse rated at 200 A upstream. That is the maximum fuse that still protects the contactor under short-circuit conditions — verify your existing branch-circuit protection does not exceed this if you are retrofitting into an existing panel. ## Environmental and Installation Limits The storage range matters if you are holding this as a critical spare in an unheated warehouse — it can sit through a winter without damage. Installation altitude is limited to 2000 m above sea level; above that, dielectric strength and air-gap clearance derate, so a different contactor or derating factor applies.","metaTitle":"Siemens 3RT7045-1AH00 S3 Contactor, 3-Pole, AC-3 690V, Activ","metaDescription":"Siemens 3RT7045-1AH00 S3 contactor, 3 NO main contacts, AC-3 rated to 690 V. Screw terminals, IP20 front. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Width":"70 mm","title":"3RT7045-1AH00","Height":"148 mm","at 50 Hz":"0.27","at 60 Hz":"0.31","description":"Contactor AC-3 80/37kW 400V 48 VAC, 50 Hz 3-pole, Size S3 Screw terminal","On The Front":"IP20","During Storage":"-25 ... +70 °C","Of The Terminal":"IP00","at AC-3 maximum":"800 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","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":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Degree Of Pollution":"3","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"42 V","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Insulation Voltage Rated Value":"690 V","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"0.61 W","holding power of magnet coil at DC":"0.26 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG NH 3NA: 200 A","shock resistance with sine pulse at AC":"10.6g / 5 ms, 6.2g / 10 ms","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":"acceptability for PLC control (17 V, 5 mA)","Type Of Voltage Of The Control Supply Voltage":"AC","operating voltage at AC-3 rated value maximum":"690 V","operational current at DC-13 at 220 V rated value":"0.3 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","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","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"50 mm²","Connectable Conductor Cross-Section For Auxiliary Contacts Finely Stranded With Core End Processing":"0.5 ... 2.5 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6305ffc31ff9c496afd0e246313f8fa8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534154&mlfb=3RT7045-1AH00"},"ai":{"faq":[{"question":"What are the key ratings for the 3RT7045-1AH00?","answer":"It is a 3-pole Size S3 contactor with 3 NO main contacts, AC-3 rated voltage up to 690 V, AC-3 max switching frequency 800 ops/h, AC-4 max 250 ops/h, IP20 front / IP00 terminals, screw-type terminals for main and control circuits, and a 6 kV surge voltage resistance."},{"question":"What mounting options does the 3RT7045-1AH00 support?","answer":"It supports screw fixing and snap-on mounting onto both 35 mm and 75 mm standard mounting rails. It can be rotated ±180° on a vertical surface and tilted ±22.5° forward/backward on a vertical surface."},{"question":"What is the operating temperature range for this contactor?","answer":"During operation it is rated for -10 °C to +55 °C. During storage the range is -25 °C to +70 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7045-1AH00","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/3RT7045-1AH00 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}}