{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT6018-1BG42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT6018-1BG42","canonicalUrl":"https://aoctrl.com/siemens/3RT6018-1BG42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT6018-1BG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT6018-1BG42, DC 125 V coil, 7.5 kW at 400 V AC-3, 3-pole with 1 NC auxiliary contact, size S00, screw-type terminals.","salesMarkdown":"The Siemens SIRIUS 3RT6018-1BG42 is a size S00 power contactor rated for 7.5 kW at 400 V in AC-3 duty and 4 kW at 230 V, with a DC 125 V coil. It switches three main poles and carries one normally-closed auxiliary contact — the 1NC in the order code. ## Switching frequency and duty Rated for 750 operations per hour in AC-3 and AC-3e duty, this contactor handles frequent motor starts typical of conveyor sections or pump cycling. That 750 1/h figure governs the thermal load on the coil and arc chamber — exceed it and the contactor overheats, shortening life. For less demanding resistive loads (AC-1) the permissible rate is higher, but for motor switching this is the number to respect in the PLC cycle time. Size S00 means 45 mm wide, 57.5 mm tall, 73 mm deep — a compact footprint that leaves room on the DIN rail for an overload relay or auxiliary contact block. The screw terminals accept 2x (0.5 to 2.5 mm²) solid or stranded, or 2x 4 mm² for the main circuit.","metaTitle":"Siemens 3RT6018-1BG42 SIRIUS Power Contactor, DC 125V, 7.5 k","metaDescription":"Siemens SIRIUS 3RT6018-1BG42 power contactor, DC 125V coil, 7.5 kW at 400V AC-3, 3-pole, 1 NC aux contact, size S00, screw terminals. Current lifecycle stage. Available to order ag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"at AC-3 maximum":"750 1/h","lifecycle_stage":"current","at AC-3e maximum":"750 1/h","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 230 V rated value":"4 kW","at 400 V rated value":"7.5 kW","at 690 V rated value":"7.5 kW","at AC-3 rated value maximum":"690 V","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"05/01/2012"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4ac500c0028de9eef455e781ab994713.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=723083&mlfb=3RT6018-1BG42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT6018-1BG42/alternatives.json"},"ai":{"faq":[{"question":"What is the motor power rating for 3RT6018-1BG42 at 400 V?","answer":"At 400 V AC-3 duty, it is rated for 7.5 kW. At 230 V AC-3 the rating is 4 kW, and at 690 V it also carries 7.5 kW."},{"question":"What is the AC-3 switching frequency of this contactor?","answer":"Rated at 750 operations per hour in AC-3 and AC-3e duty. That is the maximum switching rate for motor loads."},{"question":"Where can I buy 3RT6018-1BG42?","answer":"This part is sourced to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RT6018-1BG42 drop into a panel specified for 3RT6018-1AB02?","answer":"Both are size S00 SIRIUS contactors with the same 45 mm width and 35 mm DIN rail mounting, so the mechanical fit is identical. The main difference is the coil: 3RT6018-1BG42 uses a DC 125 V coil, while 3RT6018-1AB02 uses an AC 24 V coil. Verify the control voltage before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT6018-1BG42","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/3RT6018-1BG42 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}}