{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-1BB44-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-1BB44-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-1BB44-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1BB44-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1034-1BB44-3MA0, S2 frame size, 24 VDC coil, screw-type terminals, DIN rail mount, 18.5 kW at 500 V AC-3.","salesMarkdown":"It carries a 24 VDC coil and terminates main circuits via screw-type terminals. The headline motor ratings tell you what three-phase induction motor this contactor can switch in normal duty. At 500 V AC-3 (starting and running a squirrel-cage motor), it is rated 18.5 kW; at 690 V AC-3, 10 kW. That 18.5 kW at 500 V is the figure that governs most 400/480 V line applications — the contactor handles the inrush and break current for motors up to that power. For AC-2 duty (slip-ring motors, partial-load switching) at 400 V, it is rated 15 kW. For AC-4 (plugging, inching, reversing), the rating drops to 29 A at 400 V — a lower continuous capability because the contactor sees more frequent arc interruption. The switching frequency limits back this up: 1 000 cycles/hour for AC-3, 250 cycles/hour for AC-4. If your application cycles faster than that, the contactor will overheat the arc chamber. ## Coil and Control Circuit Details For DC coil voltages beyond 24 V, the holding currents scale down: 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V. The coil is polarity-sensitive on DC; verify the free-wheel diode or suppression network orientation before wiring. The mechanical endurance is 10 million cycles, so the armature and spring set outlast most motor starts in a typical line. ## Wiring and Conductor Sizing The screw terminals accept a wide range of conductors. For solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²). For stranded wire: 2x (0.75 to 25 mm²). For solid or stranded combined: 2x (0.75 to 16 mm²). At 40 °C ambient, the minimum permissible cross-section is 16 mm² — that is the thermal derating floor for full rated current. The terminal design allows two conductors per clamp, useful for daisy-chaining control power.","metaTitle":"Siemens SIRIUS 3RT1034-1BB44-3MA0 Power Contactor, S2 Frame,","metaDescription":"Siemens SIRIUS 3RT1034-1BB44-3MA0 power contactor, S2 frame, 24 VDC coil. Rated 18.5 kW at 500 V AC-3, 10 kW at 690 V AC-3. Screw terminals, DIN rail mount. Current lifecycle stage","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":"24 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=399602&mlfb=3RT1034-1BB44-3MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-1BB44-3MA0/alternatives.json"},"ai":{"faq":[{"question":"What is the listed depth of 3RT1034-1BB44-3MA0?","answer":"179 mm. This is the depth from the DIN rail mounting surface to the furthest projection of the contactor body."},{"question":"What solid conductor sizes does the terminal accept?","answer":"The screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) solid wire."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-1BB44-3MA0","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/3RT1034-1BB44-3MA0 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}}