{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-1BG42-0CC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-1BG42-0CC0","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-1BG42-0CC0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1BG42-0CC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2018-1BG42-0CC0, AC-3 contactor, 7.5 kW / 400 V motor rating, DC 125 V coil, 1NC auxiliary, 3-pole, size S00 screw terminal.","salesMarkdown":"Its AC-3 rating of 7.5 kW at 400 V defines the maximum three-phase induction motor it can switch under full load — a standard 10 hp (7.5 kW) motor on a 400 V line. The DC 125 V coil means this variant is intended for systems with a DC control bus at that voltage, not the more common 24 VDC or 110 VAC coils. ## What the ratings mean in practice At 7.5 kW / 400 V, the contactor's rated operational current in AC-3 is approximately 16 A. The S00 frame size occupies roughly 45 mm width on DIN rail, leaving room for an overload relay and busbars in a standard motor starter assembly. Screw terminals on the S00 frame accept 1 x (0.75–4 mm²) or 2 x (0.75–2.5 mm²) solid/stranded copper. Torque to 1.2–1.5 Nm. The DC 125 V coil draws approximately 40 W inrush, 4 W hold — confirm the control transformer or DC supply can deliver the inrush without voltage sag. The contactor is IP20 rated for finger-safe installation inside an enclosure; no IP65 rating for external mounting.","metaTitle":"Siemens 3RT2018-1BG42-0CC0 Contactor, AC-3 7.5kW/400V, DC 12","metaDescription":"Siemens SIRIUS 3RT2018-1BG42-0CC0 contactor, AC-3 rated 7.5 kW at 400 V, DC 125 V coil, 1NC aux, S00 screw terminals. Current lifecycle stage: active production. Sourced to order a","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current"}},"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=216851&mlfb=3RT2018-1BG42-0CC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1BG42-0CC0/alternatives.json"},"ai":{"faq":[{"question":"What is the DC coil voltage on this contactor?","answer":"The coil is rated for DC 125 V, so it requires a DC control supply at that voltage — not compatible with 24 VDC or 110 VAC coils without a converter."},{"question":"What motor power can this contactor switch?","answer":"It is rated for AC-3 duty at 7.5 kW at 400 V, which covers a standard 10 hp three-phase induction motor on a 400 V line."},{"question":"Does this contactor include auxiliary contacts?","answer":"Yes, it comes with one normally-closed (1NC) auxiliary contact built in."},{"question":"What is the frame size and terminal type?","answer":"It is size S00 with screw terminals, designed for DIN-rail mounting and panel wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-1BG42-0CC0","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/3RT2018-1BG42-0CC0 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}}