{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5045-1AG20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5045-1AG20","canonicalUrl":"https://aoctrl.com/siemens/3RT5045-1AG20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1AG20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S3, order code 3RT5045-1AG20, screw-type terminals, 70 mm width, 146 mm height, 139 mm depth, rated for motor loads up to 38 kW at 230 V and 66 kW at 400 V at 60 °C.","salesMarkdown":"At 60 °C ambient, it is rated for 38 kW at 230 V and 66 kW at 400 V, with a 690 V rating of 114 kW — these are the motor power ratings that govern real-world sizing, not the lower-temperature figures. The contactor handles up to 1 000 switching cycles per hour in AC-3 duty (AC-3e maximum), matching typical conveyor and pump cycling rates. Operating temperature spans -25 to +60 °C, storage -55 to +80 °C, and the insulation voltage is rated 1 000 V. RoHS compliance is dated to March 1, 2017, covering the EU substance restrictions. The part carries the SIRIUS brand and is backed by Siemens' standard documentation package (declaration of conformity, UL/CSA/CE certifications available on request). Mounts on 35 mm or 75 mm DIN rail with screw or snap-on fastening. The 70 mm width and 146 mm height leave room for auxiliary contact blocks alongside. Main circuit terminals accept 2x (2.5... 16 mm²) solid or stranded copper, or 2x (10... 1/0) AWG. ## Coil and auxiliary ratings The coil draws 6 A at 24 V rated value, 1 A at 110 V, and 0.3 A at 220 V — these are the pick-up/hold currents for the control circuit, not the main contact ratings. At 50/60 Hz the coil impedance is 0.29 per the spec, consistent with a standard AC-operated solenoid. Mechanical endurance is 10 000 000 operating cycles typical, with electrical endurance varying by duty: AC-1 (resistive) up to 900 cycles/hour, AC-3 (motor) up to 1 000 cycles/hour, AC-4 (plugging/inching) up to 300 cycles/hour. The 5 000 cycles/hour figure at AC refers to the no-load mechanical rate.","metaTitle":"Siemens 3RT5045-1AG20 SIRIUS Power Contactor, S3, 70 mm","metaDescription":"Siemens 3RT5045-1AG20 SIRIUS power contactor, Size S3, 70 mm width, screw-type terminals, rated 38 kW at 230 V / 66 kW at 400 V at 60 °C. Active production. Quoted to order.","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":"0.29","at 60 Hz":"0.29","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 DIN rail","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":"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":"110 V","at 60 Hz rated value":"110 V","at 690 V rated value":"21.1 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-3e rated value maximum":"1 000 V","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/7a1142634600657f8373afd5609dadbe.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580030&mlfb=3RT5045-1AG20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1AG20/alternatives.json"},"ai":{"faq":[{"question":"Does 3RT5045-1AG20 drop into a panel built for 3RT5045-1AF00?","answer":"Both are Size S3 contactors with the same 70 mm width and screw-type terminals, so the mechanical footprint and wiring interface are identical. The 1AG20 variant carries a different coil voltage or auxiliary configuration — verify the coil rating against your control voltage before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5045-1AG20","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/3RT5045-1AG20 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}}