{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-1AQ20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-1AQ20","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-1AQ20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1AQ20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1034-1AQ20, size S2, screw-type terminals, 18.5 kW at 500 V AC-3, 15 kW at 400 V AC-2, for 50/60 Hz operation.","salesMarkdown":"The Siemens SIRIUS 3RT1034-1AQ20 is a size S2 power contactor rated for switching motor loads up to 18.5 kW at 500 V under AC-3 duty (standard squirrel-cage motors), and 15 kW at 400 V under AC-2 duty (slip-ring motors or moderate starting). It handles 10 kW at 690 V, so it can serve 690 V delta-connected motors in European or marine panels. The AC-2 rating of 15 kW at 400 V is for more demanding applications like wound-rotor motors or frequent jogging, where the contacts make and break under load more often. Electrical life depends on the switching category and load current — the datasheet derating curves apply, but for typical AC-3 motor switching at rated current you can expect hundreds of thousands of operations before contact wear becomes a concern. The auxiliary contact block (integrated or add-on) is rated at 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for PLC inputs, pilot lights, or interlocking relays in the control circuit. The front of the contactor is IP20 (finger-safe), while the terminal area is IP00 — meaning the power connections are exposed and need to be inside an enclosure or guarded by the panel door. ## Wiring and Integration Notes The auxiliary contacts use smaller screw terminals. Use ferruled stranded wire for reliable connections in high-vibration environments like conveyor lines or compressor skids. Coil operates on 50 or 60 Hz with a voltage tolerance of 0.8 to 1.1 times rated at 50 Hz, and 0.85 to 1.1 at 60 Hz. Pick-up time is 7 to 20 ms, arcing time 10 to 15 ms — fast enough for most sequencing but worth noting if you have very tight timing requirements in a safety circuit. That's a standard size S2 footprint — it fits alongside other SIRIUS components in a pre-drilled panel layout. Side-by-side mounting means no spacing required between units, so you can pack multiple contactors into a 600 mm wide enclosure. ## Sourcing and Cross-Reference Reality This is an active, current-production part. For new designs or spares, it's a straightforward order through Siemens distribution. No last-time-buy or obsolescence concerns. If you're looking at a panel originally specified with a 3RT1036-1AB00 (a larger size S3 contactor), the 3RT1034-1AQ20 will not drop in without rewiring — the S2 has a different footprint and lower current ratings. The 3RT1034-1AQ20 is the correct size for motor loads up to 18.5 kW at 500 V; step up to the S3 frame for higher currents or larger motors.","metaTitle":"Siemens SIRIUS 3RT1034-1AQ20 Power Contactor, 18.5 kW at 500","metaDescription":"Siemens SIRIUS 3RT1034-1AQ20 power contactor, size S2, 18.5 kW at 500 V AC-3, 15 kW at 400 V AC-2. Screw terminals, DIN rail mount. Currently in production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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":"500 V","at 500 V rated value":"18.5 kW","at 60 Hz rated value":"500 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":"screw-type 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 (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","reference code according to IEC 81346-2":"Q","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)","Thermal Short-Time Current Limited To 10 S":"320 A","Finely Stranded Without Core End Processing":"2x (0.75 ... 16 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=364145&mlfb=3RT1034-1AQ20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1AQ20/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"The 3RT1034-1AQ20 is rated for 18.5 kW at 500 V AC-3 (motor starting), 15 kW at 400 V AC-2 (slip-ring or frequent-start duty), and 10 kW at 690 V. Mechanical life is 10 million operations typical. Auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V."},{"question":"What mounting and wiring does this contactor require?","answer":"It mounts on a 35 mm DIN rail per EN 50022 with screw or snap-on fastening. Side-by-side mounting is allowed. Main power terminals accept solid wire 0.5–4 mm² (two per clamp) and stranded up to 25 mm². Screw-type terminals on the main circuit."},{"question":"Will the 3RT1034-1AQ20 replace a 3RT1036-1AB00 without rewiring?","answer":"No. The 3RT1036-1AB00 is a size S3 contactor with a larger footprint and higher current ratings. The 3RT1034-1AQ20 is size S2 and will not physically or electrically drop in without panel modifications and rewiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-1AQ20","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/3RT1034-1AQ20 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}}