{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-3BM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-3BM40","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-3BM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3BM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1034-3BM40, size S2 power contactor, 18.5 kW at 500 V AC-3, screw-type terminals, 55 mm wide, DIN rail mount.","salesMarkdown":"## What This SIRIUS S2 Contactor Does Its AC-3 rating of 18.5 kW at 500 V means it handles standard squirrel-cage motors up to that power, and the 29 A AC-4 rating at 400 V covers reversing or inching duty where the contacts break full load current. The 18.5 kW motor rating at 500 V is the headline number, but the 10 kW at 690 V rating matters for systems running on higher supply voltages — it's not a simple linear derate, so check your line voltage against that column. The RoHS compliance date of May 1, 2012, confirms it meets the EU substance restrictions. CE marking is standard for the SIRIUS range, and the DIN rail mount per EN 50022 is a global standard, so it fits panels built to IEC or UL 508A practices.","metaTitle":"Siemens 3RT1034-3BM40 SIRIUS Power Contactor, 18.5 kW at 500","metaDescription":"Siemens SIRIUS 3RT1034-3BM40 power contactor, size S2, 18.5 kW at 500V AC-3. Screw terminals, DIN rail mount. In current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Solid":"2x (0.25 ... 2.5 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":"spring-loaded 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 (24 ... 14)","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 (0.25 ... 1.5 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 (0.25 ... 2.5 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":"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=26989&mlfb=3RT1034-3BM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3BM40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest second-source or alternative to the 3RT1034-3BM40?","answer":"The 3RT1034-1AN60-1AA0 is a peer in the same S2 frame size, but it uses spring-cage terminals instead of the screw-type terminals on this 3BM40. If your panel is wired for screw clamps, the 1AN60 variant would require re-terminating the power wiring. The 3RT1036-1AB00 is a larger S3 frame with higher current capacity, and the 3RT1044-1FB46 is a S6 frame for much bigger loads — neither is a direct drop-in for the S2 footprint."},{"question":"What wire sizes does the 3RT1034-3BM40 accept?","answer":"The screw-type main circuit terminals accept solid wire from 0.25 to 2.5 mm² (two conductors) and stranded wire from 0.75 to 25 mm² (two conductors). At 40 °C ambient, the minimum permissible conductor size is 16 mm² for full rated current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-3BM40","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/3RT1034-3BM40 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}}