{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-1BM44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-1BM44","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-1BM44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1BM44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S2, 3RT1034-1BM44, 55 mm width, screw terminals, snap-on DIN rail mounting, 18.5 kW at 500 V AC-3.","salesMarkdown":"## What this SIRIUS S2 contactor carries The Siemens 3RT1034-1BM44 is a SIRIUS-brand power contactor in size S2, rated to switch motor loads up to 18.5 kW at 500 V in AC-3 duty or 10 kW at 690 V. Coil draws 10 A at 24 V DC; the contactor picks up in 20 to 30 ms DC and arcs in 10 to 15 ms. Mechanical life sits at a typical 10 million operations, with AC-3 switching frequency up to 1 000 cycles per hour. ## Panel fit and wiring constraints At 55 mm wide and 112 mm tall, the S2 frame leaves room for side-by-side mounting — the datasheet explicitly allows zero-gap adjacency. Depth reaches 179 mm, so factor that into gland-plate clearance and door swing on shallow enclosures. Main circuit terminals accept stranded wire from 2x 0.75 mm² up to 2x 25 mm², or solid/stranded 2x 0.75 to 16 mm². At 40 °C ambient, the minimum permissible conductor is 16 mm² — that's the thermal derating floor, not a suggestion. ## Duty-cycle reality check The AC-1 resistive load rating hits 1 200 cycles/hour, but AC-4 (plugging/reversing) drops to 250 cycles/hour — that's the mechanical limit under inrush stress. For motor starting (AC-3), 1 000 cycles/hour is the ceiling; don't push beyond it on frequent-start conveyors. DC switching ratings are modest: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. If you're breaking DC motor fields or solenoid valves, verify the load falls under these curves — the contactor isn't a DC load-break specialist.","metaTitle":"Siemens 3RT1034-1BM44 SIRIUS Power Contactor, S2, 55 mm","metaDescription":"Siemens 3RT1034-1BM44 SIRIUS power contactor, size S2, 55 mm width. Rated 18.5 kW at 500 V AC-3, 10 A at 24 V DC coil. Screw terminals, snap-on DIN rail. Current lifecycle stage. Q","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":"220 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=367146&mlfb=3RT1034-1BM44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1BM44/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for 3RT1034-1BM44?","answer":"Motor switching: 18.5 kW at 500 V AC-3, 10 kW at 690 V AC-3. Coil: 24 V DC, 10 A. Mechanical life: 10 million operations. Dimensions: 55 mm wide, 112 mm tall, 179 mm deep. Mounts on 35 mm DIN rail."},{"question":"Where can I buy 3RT1034-1BM44 and how is it quoted?","answer":"This part is available through independent distribution channels. Pricing and availability are confirmed at quote time against an RFQ — no stock count or price is published here."},{"question":"What compliance documentation does 3RT1034-1BM44 carry?","answer":"RoHS compliance is confirmed with a substance prohibition date of May 1, 2012. The contactor carries IP20 front protection and IP00 terminal protection, with pollution degree 3 rating for industrial environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-1BM44","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/3RT1034-1BM44 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}}