{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5045-1AH00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5045-1AH00","canonicalUrl":"https://aoctrl.com/siemens/3RT5045-1AH00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1AH00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, size S3, 3RT5045-1AH00, screw-type terminals, rated insulation voltage 1000 V, surge voltage resistance 6 kV.","salesMarkdown":"## SIRIUS S3 power contactor — 3RT5045-1AH00 The Siemens 3RT5045-1AH00 is a SIRIUS-branded power contactor in size S3, designed for motor switching and general load management in industrial control panels. Its rated insulation voltage of 1000 V and surge voltage resistance of 6 kV define the isolation coordination for a 400/690 VAC system — pollution degree 3 means it's rated for the conductive environment typical of a factory floor, not a clean room. Mounting is flexible: screw-fixed or snap-on onto 35 mm and 75 mm standard mounting rail. Main-circuit and auxiliary/control terminals are both screw-type, accepting 2x (2.5…16 mm²) solid/stranded or 2x (10…1/0) AWG. At 40 °C the minimum permissible cross-section is 50 mm²; at 60 °C it derates to 35 mm² — a detail that matters when sizing the incoming feeder under elevated ambient conditions inside a sealed enclosure. ## Ratings and so-what for the buyer Motor power ratings are given at 60 °C: 38 kW at 230 V, 66 kW at 400 V, 114 kW at 690 V. These are the figures that govern real-world motor starting in a warm panel — the AC-3 duty cycle (making and breaking locked-rotor current) is what the contactor is sized for, not the resistive AC-1 numbers. At 690 V the contactor handles 21.1 kW, matching the 114 kW at 60 °C derating curve. Electrical switching rates vary by duty: AC-1 allows 900 cycles/hour, AC-3 allows 1000 cycles/hour, AC-4 drops to 300 cycles/hour — the AC-4 limit reflects the harsher arc stress of plugging or inching duty. For high-cycling applications like conveyor indexing, stay within the AC-3 maximum of 1000 1/h. Auxiliary contact ratings cover the control-voltage range: 6 A at 24 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V. These are the make/break capacities for the PLC output or relay driving the coil — a 24 VDC PLC output must be rated to switch the 6 A inrush of the contactor's own coil. That fuse size is the maximum allowed to keep the contactor within its conditional short-circuit rating — don't oversize it or the contactor may weld on a fault. The storage limit governs handling during transit and warehouse idle — it's not a running condition.","metaTitle":"Siemens 3RT5045-1AH00 SIRIUS Power Contactor, S3, 1000V, 6kV","metaDescription":"Siemens SIRIUS 3RT5045-1AH00 power contactor, size S3. Active production. Screw terminals, 1000V rated insulation, 6kV surge. Sourced to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Width":"70 mm","at AC":"5 000 1/h","Height":"146 mm","at 50 Hz":"0.27","During Storage":"-55 ... +80 °C","at AC-1 maximum":"900 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °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 (2.5 ... 16 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Power contactor","at 24 V rated value":"6 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 690 V rated value":"21.1 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"03/01/2017","at 40 °C minimum permissible":"50 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"38 kW","at 400 V at 60 °C rated value":"66 kW","at 690 V at 60 °C rated value":"114 kW","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 250 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)","at ambient temperature 40 °C rated value":"120 A","at ambient temperature 60 °C rated value":"100 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","Type Of Voltage Of The Control Supply Voltage":"AC","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d9d65f28387ec42c3769a2790bd3fae0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580031&mlfb=3RT5045-1AH00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1AH00/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5045-1AH00","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/3RT5045-1AH00 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}}