{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-1BD44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-1BD44","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-1BD44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1BD44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S2 frame, 3RT1034-1BD44, screw-type terminals, 18.5 kW at 500 V AC-3, DIN EN 50022 rail mount, IP20 front, current lifecycle.","salesMarkdown":"## SIRIUS S2 Power Contactor — 3RT1034-1BD44 It is rated for 18.5 kW at 500 V and 10 kW at 690 V under AC-3 duty, which covers the majority of three-phase induction motor applications up to that power. The AC-3 motor-switching rating of 18.5 kW at 500 V and 10 kW at 690 V defines the maximum three-phase motor load this contactor can switch under typical starting conditions (6–8× locked-rotor current). For a 400 V supply, the corresponding AC-3 current is 29 A — the value that governs thermal sizing in a motor starter. The -25 °C lower limit is common for indoor panel installations; if the panel sits in an unconditioned outdoor shelter in a cold climate, verify the ambient stays above that threshold. The auxiliary contact ratings cover 24 VDC at 10 A down to 220 VDC at 0.3 A — these are resistive-load figures; for inductive DC loads like relay coils, derate or add a free-wheeling diode across the load. RoHS compliance is confirmed per the substance prohibitance date of May 1, 2012, covering the EU RoHS directive. No separate UL or CSA listing is shown in the spec record, but the SIRIUS series broadly carries these approvals — confirm the specific certification mark on the nameplate if the installation requires a UL-listed device. ## Integration Notes The minimum permissible cross-section at 40 °C ambient is 16 mm² for the main circuit, which guides feeder sizing. Switching frequency varies by duty: up to 1,200 operations per hour at AC-1 (resistive), 1,000 at AC-3 (motor), and 250 at AC-4 (plugging/inching). For high-cycle applications like reversing starters, the AC-4 limit is the binding constraint.","metaTitle":"Siemens 3RT1034-1BD44 SIRIUS Power Contactor, S2 Frame, 18.5","metaDescription":"Siemens SIRIUS 3RT1034-1BD44 power contactor, S2 size. Rated 18.5 kW at 500 V AC-3. Screw terminals, DIN rail mount. Current lifecycle stage. IP20 front. RoHS compliant since 2012.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"179 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"55 mm","at DC":"20 ... 30 ms","Height":"112 mm","Stranded":"2x (0.75 ... 25 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"42 V","On The Front":"IP20","Initial Value":"0.8","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","Full-Scale Value":"1.1","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 500 V rated value":"18.5 kW","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","closing power of magnet coil at DC":"13.3 W","holding power of magnet coil at DC":"13.3 W","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)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","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":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","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=309079&mlfb=3RT1034-1BD44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1BD44/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of this contactor?","answer":"The depth is 179 mm, measured from the mounting rail face to the furthest projection of the screw terminals."},{"question":"What solid conductor sizes does the terminal accept?","answer":"Each clamp accepts two solid conductors in the range 0.5…1.5 mm² or 0.75…2.5 mm², with a maximum of two conductors at 0.75…4 mm²."},{"question":"Will this contactor drop into a panel designed for 3RT1044-1FB46?","answer":"No — the 3RT1044-1FB46 is an S3 frame (larger physical size), so the mounting hole pattern, DIN rail footprint, and terminal positions differ. The 3RT1034-1BD44 is an S2 frame and will not align without panel modifications."},{"question":"What compliance documentation is available for this part?","answer":"RoHS compliance is documented with a substance prohibitance date of May 1, 2012. UL or CSA listing is not explicitly confirmed in the spec record, though the SIRIUS series commonly carries these — verify the marking on the device nameplate for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-1BD44","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/3RT1034-1BD44 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}}