{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-1UB42-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-1UB42-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-1UB42-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1UB42-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2018-1UB42-1AA0 power contactor, AC-3e/AC-3 16 A, 7.5 kW / 400 V, 3-pole, 24 V DC coil, integrated varistor, 1 NC auxiliary, screw terminal, Size S00.","salesMarkdown":"## Ratings and fit for motor loads The 3RT2018-1UB42-1AA0 is a Size S00 power contactor rated AC-3e/AC-3 at 16 A, switching 7.5 kW at 400 V across three poles. The AC-3e rating means it is certified for switching squirrel-cage motors — making and breaking the motor's locked-rotor current during starting and stopping. The 16 A AC-3e figure is the duty-class rating that governs real motor load fit, not a generic thermal current. The coil is 24 V DC with an integrated varistor for suppression. The varistor clamps the inductive kick when the coil de-energizes, which protects nearby PLC outputs or relay contacts sharing the same DC supply rail. The auxiliary contact is 1 NC — one normally-closed feedback contact for status indication or interlocking. Compliance documentation is available: RoHS compliant since October 1, 2009, and REACH Article 33 information is published on the current candidate list. Upright mounting position is specified — horizontal or inverted mounting may require derating. Screw terminals accept standard power and control wiring; the integrated varistor is internal, so no external suppression module is needed on the coil circuit. Packaged singly, dimensions 63 x 80 x 50 mm. The 1 NC auxiliary is built in; additional auxiliary contact blocks can be front-mounted if more feedback signals are needed, but the base unit carries one NC as standard.","metaTitle":"Siemens 3RT2018-1UB42-1AA0 Power Contactor, 16 A AC-3e, 24 V","metaDescription":"Siemens 3RT2018-1UB42-1AA0 power contactor, AC-3e/AC-3 rated 16 A, 7.5 kW at 400 V, 3-pole, 24 V DC coil with integrated varistor, 1 NC auxiliary contact, screw terminal, Size S00.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"title":"3RT2018-1UB42-1AA0","Group Code":"R711","description":"power contactor, AC-3e/AC-3, 16 A, 7.5 kW / 400 V, 3-pole, 24 V DC, with integrated varistor, auxiliary contacts: 1 NC, screw terminal, size: S00, upright mounting position","Product Group":"5330","Product class":"A: Standard product which is a stock item could be returned within the returns guidelines/period.","Quantity Unit":"1 Piece","Product Family":"Ordering Data Overview","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : N","Packaging dimensions (L x W x H)":"63.00 x 80.00 x 50.00 mm","Compliance with the substance restrictions according to RoHS directive":"Since: 01-10-09","REACH Art. 33 Duty to inform according to the current list of candidates":"Reach Information"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ba078c41f16603d9891652134ab380f5.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3RT2018-1UB42-1AA0?tree=CatalogTree"},"ai":{"faq":[{"question":"What is the group code and product group for this part?","answer":"The Group Code is R711 and the Product Group is 5330. These are Siemens internal classification codes used for catalog sorting and cross-reference."},{"question":"What compliance documentation is available?","answer":"RoHS compliance since October 1, 2009, and REACH Article 33 information is published. Export control is AL: N / ECCN: N, meaning no special export licensing is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-1UB42-1AA0","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/3RT2018-1UB42-1AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}