{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-3AN20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-3AN20","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-3AN20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3AN20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1034-3AN20, Size S2, 18.5 kW at 500 V AC-3, screw-type terminals, 55 mm width, snap-on DIN rail mounting.","salesMarkdown":"It carries an AC-3 rating of 18.5 kW at 500 V, meaning it handles the inrush and run currents of a standard three-phase induction motor at that voltage without derating. The headline motor rating is 18.5 kW at 500 V AC-3 — that is the duty cycle for starting and disconnecting a squirrel-cage motor under full load. At 690 V the same contactor is rated for 10 kW, which reflects the higher voltage stress on the arc chamber. The AC-4 rating (plugging/reversing) is 250 switching cycles per hour, compared to 1 000 per hour for AC-3 — if your application involves frequent inching or reversing, the AC-4 limit governs service life. If you are managing a multi-year category plan, the SIRIUS platform is Siemens' core industrial contactor family with broad cross-series compatibility — the same accessories, same DIN-rail footprint, and same auxiliary contact blocks across S2 frame sizes. That reduces second-source qualification risk if you ever need to substitute within the family. ## Terminal wiring and conductor sizing The main circuit accepts screw-type terminals: solid conductors 2x (0.25 to 2.5 mm²) and stranded conductors 2x (0.75 to 25 mm²). The wider stranded range covers the full cross-section for a 18.5 kW motor circuit at 500 V — typically 6 to 10 mm² depending on cable length and installation method. The auxiliary/control terminals accept 2x (0.75 to 16 mm²) stranded, which is generous for control wiring.","metaTitle":"Siemens 3RT1034-3AN20 SIRIUS Power Contactor, 18.5 kW at 500","metaDescription":"Siemens 3RT1034-3AN20 SIRIUS power contactor, Size S2, 18.5 kW at 500 V AC-3, screw terminals, 55 mm wide, active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55 mm","at AC":"7 ... 20 ms","Height":"112 mm","Stranded":"2x (0.75 ... 25 mm²)","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"1 200 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"250 1/h","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":"S2","Solid Or Stranded":"2x (0.75 ... 16 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":"220 V","at 500 V rated value":"18.5 kW","at 60 Hz rated value":"220 V","at 690 V rated value":"10 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"15 kW","at AC-4 at 400 V rated value":"29 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"16 mm²","at 60 °C minimum permissible":"10 mm²","Insulation Voltage Rated Value":"690 V","at 230 V at 60 °C rated value":"18 kW","at 690 V at 60 °C rated value":"54 kW","at AWG cables for main contacts":"2x (18 ... 2)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 63 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 125 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Thermal Short-Time Current Limited To 10 S":"320 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"11.3 VA","apparent pick-up power of magnet coil at AC":"127 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.73","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.41","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=398101&mlfb=3RT1034-3AN20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3AN20/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RT1034-3AN20?","answer":"The 3RT1036-1AB00 is a Size S2 peer in the same SIRIUS family, but it uses spring-cage terminals instead of screw-type. The 3RT1034-3AN20 has screw terminals for the main circuit; if your panel wiring standard requires spring-cage, the 3RT1036 variant is the direct functional equivalent with the same AC-3 rating and footprint."},{"question":"What is the depth of the 3RT1034-3AN20?","answer":"The depth is 115 mm, which is the dimension from the DIN-rail mounting surface to the furthest projection of the contactor body."},{"question":"What solid conductor sizes does the 3RT1034-3AN20 accept?","answer":"The main circuit screw terminals accept solid conductors 2x (0.25 to 2.5 mm²). For stranded conductors the range is 2x (0.75 to 25 mm²)."},{"question":"Will the 3RT1034-3AN20 drop into a panel specified for the 3RT1036-1AB00?","answer":"Yes — both are Size S2 contactors with the same 55 mm width, 112 mm height, and 115 mm depth, and both mount on 35 mm DIN rail per DIN EN 50022. The only difference is the terminal type: screw-type on the 3RT1034-3AN20 versus spring-cage on the 3RT1036-1AB00. No rewiring of the panel layout is needed, but the lug type on your pre-cut wires must match the terminal."},{"question":"What compliance documentation does Siemens provide for the 3RT1034-3AN20?","answer":"As a standard SIRIUS catalog item, Siemens provides a declaration of conformity covering the Low Voltage Directive (2014/35/EU), RoHS (2011/65/EU), and REACH (EC 1907/2006). The contactor carries CE marking and is designed to meet IEC 60947-4-1 for contactors and motor-starters. UL/CSA listing is typical for the SIRIUS line, but specific certification numbers should be verified against the nameplate on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-3AN20","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/3RT1034-3AN20 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}}