{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-1AH20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-1AH20","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-1AH20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1AH20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1034-1AH20 power contactor, size S2, screw-type terminals, 18.5 kW at 500 V AC-3, 55 mm wide, snap-on DIN rail mount.","salesMarkdown":"The Siemens SIRIUS 3RT1034-1AH20 is a size S2 power contactor rated for 18.5 kW at 500 V under AC-3 duty, with a 10 kW rating at 690 V. It snaps onto a standard 35 mm DIN rail per EN 50022 and measures 55 mm wide, 112 mm tall, and 115 mm deep — a compact footprint for a S2 frame that leaves room for auxiliary blocks on the side, since side-by-side mounting is supported. AC-3 switching at 500 V is the headline motor-rating figure here — 18.5 kW tells you the contactor is sized for a 25 hp class induction motor on a 480 V line. The AC-2 rating of 15 kW at 400 V covers slip-ring or wound-rotor motor starts where the inrush is lower but the break current is sustained. ## Termination and environment Main circuit termination is screw-type terminals. Solid conductors accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded conductors go up to 2x (0.75 to 25 mm²) — that 25 mm² top end covers the line-side feed for a full-rated motor circuit without needing a separate terminal block. IP20 on the front, IP00 at the terminals — the terminal area is live and needs finger-safe shrouding or a cover if the panel is accessible to operators. The 60 °C top end means it can sit next to a transformer or drive in a warm cabinet without derating the coil pickup — the coil hold-in is already specified for that band.","metaTitle":"Siemens 3RT1034-1AH20 SIRIUS Power Contactor, 18.5 kW at 500","metaDescription":"Siemens SIRIUS 3RT1034-1AH20 power contactor, size S2, 18.5 kW at 500 V, AC-3 duty. Screw terminals, DIN rail mount. Current lifecycle stage. Sourced to order.","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":"48 V","at 500 V rated value":"18.5 kW","at 60 Hz rated value":"48 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=191486&mlfb=3RT1034-1AH20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1AH20/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of this contactor?","answer":"The depth is 115 mm. Combined with a width of 55 mm and height of 112 mm, it fits a standard S2 frame footprint on DIN rail."},{"question":"What conductor sizes does the screw terminal accept?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded: 2x (0.75 to 25 mm²). The 25 mm² stranded capacity handles full motor-circuit feeds without an intermediate block."},{"question":"What is the rated motor power at 500 V?","answer":"18.5 kW at 500 V under AC-3 duty. At 690 V AC-3 it is rated 10 kW. For AC-2 slip-ring motor starts at 400 V, the rating is 15 kW."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-1AH20","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/3RT1034-1AH20 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}}