{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TF42-20","brand":"ABB","brandSlug":"abb","productSlug":"TF42-20","canonicalUrl":"https://aoctrl.com/abb/TF42-20","factsUrl":"https://aoctrl.com/api/mcp/products/TF42-20","rawCanonicalId":null},"summary":{"shortDescription":"Eaton A-Line TF42-20 thermal overload relay, 3-pole, 16-20 A adjustable, NEMA type, Trip Class 10, for AF9-AF38 contactors.","salesMarkdown":"The Eaton TF42-20 is a 3-pole thermal bi-metallic overload relay rated for 16 to 20 amps, adjustable via the dial. The relay is designed for use with AF Series contactors in the AF9 through AF38 frame sizes, so it bolts directly onto those contactor bodies without extra brackets. ## Integration with AF contactors This relay mounts directly to the output side of AF9 through AF38 contactors. The thermal element senses motor current through the contactor's power poles, so no separate current transformers are needed. Selectable manual or automatic reset — set it to auto for remote restart applications or manual for attended machinery where you want an operator to acknowledge the trip before restarting. The 16-20 A adjustable range covers motors drawing between roughly 7.5 and 10 HP at 460 V three-phase. Trip Class 10 matches the starting characteristics of most general-purpose induction motors — compressors, pumps, fans. The NEMA type designation means the overload relay follows NEMA ICS 2-322 mounting and performance standards, which is the common spec for North American industrial control panels. The A-Line family shares the same form factor as other Eaton A-Line components, so the visual lineup in a panel stays consistent.","metaTitle":"TF42-20 Overload Relay, 20 A, 3-Pole, NEMA, A-Line","metaDescription":"TF42-20 thermal overload relay, 16-20 A adjustable, Trip Class 10, for AF9-AF38 contactors. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Amps":"20","Type":"NEMA","Poles":"3","title":"TF42-20","Amps Range":"16 - 20","description":"16.0 - 20.0 Amp, IEC, Overload Relay|16.0 - 20.0 Amp, IEC, Overload Relay, Type: Thermal Bi-Metallic, Trip Class 10. Selectable Manual or Automatic Reset. For use with AF Series, AF9 - AF38 Frame Contactors.","Family / Style":"A-Line","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/76b9873ddd72eed8fd30a52ee6f035e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What contactors does the TF42-20 fit?","answer":"The TF42-20 is designed for use with AF Series contactors in the AF9 through AF38 frame sizes. It mounts directly to the output side of those contactors."},{"question":"What is the adjustable amp range on the TF42-20?","answer":"The TF42-20 adjusts from 16 to 20 amps via a dial on the front of the relay. Set it to match the motor nameplate full-load current."},{"question":"Where can I buy the TF42-20 and get current pricing?","answer":"The TF42-20 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/TF42-20","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/TF42-20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}