{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TF42-38","brand":"ABB","brandSlug":"abb","productSlug":"TF42-38","canonicalUrl":"https://aoctrl.com/abb/TF42-38","factsUrl":"https://aoctrl.com/api/mcp/products/TF42-38","rawCanonicalId":null},"summary":{"shortDescription":"Eaton A-Line TF42-38 thermal overload relay, 3-pole, 35-40 A range, Trip Class 10, for AF9-AF38 contactors.","salesMarkdown":"The Eaton TF42-38 is a thermal bi-metallic overload relay in the A-Line family, rated for 35.0 to 40.0 Amp motor circuits. Selectable manual or automatic reset gives the commissioning engineer a choice: auto for remote or unmanned sites, manual for attended lines where you want a positive reset after a fault. The 35-40 A range is the adjustable full-load current window, set via the dial on the relay face. For a controls integrator wiring a 15 kW (20 HP) motor at 400 V — which draws roughly 28-30 A full-load — you'd dial it to the motor nameplate FLA. The Trip Class 10 curve means it clears a fault before the motor insulation sees damaging heat, but won't drop out on a normal start that clears in under 10 seconds. Spring-cage terminals on the relay accept 0.2-2.5 mm² stranded or solid copper — standard for panel wiring. The reset mode selector (manual/auto) is a slide switch on the front; if you're wiring a safety circuit that requires manual reset after a trip, set it before power-up.","metaTitle":"TF42-38 Overload Relay, 35-40A, Trip Class 10, for AF Contac","metaDescription":"TF42-38 thermal overload relay, 35-0-40.0 A range, Trip Class 10, for AF9-AF38 contactors. Current lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Type":"NEMA","Poles":"3","title":"TF42-38","Amps Range":"35 - 40","description":"35.0 - 40.0 Amp, IEC, Overload Relay|35.0 - 40.0 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":"$25.83","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/76b9873ddd72eed8fd30a52ee6f035e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy TF42-38 and how do I get a price?","answer":"The TF42-38 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest pin-compatible alternative to TF42-38?","answer":"The TF42-38 is designed specifically for AF Series contactors, frames AF9 through AF38. Within that frame range, the TF42-38 is the direct thermal overload relay — no pin-compatible alternative exists in the same family for the same contactor interface."},{"question":"What is TF42-38's listed type (NEMA) on this component line?","answer":"The TF42-38 is listed as NEMA type, meaning it follows NEMA form-factor and mounting conventions rather than the slim IEC-style footprint."},{"question":"What is TF42-38's listed poles (3) on this component line?","answer":"The TF42-38 is a 3-pole overload relay, matching three-phase motor circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/TF42-38","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/TF42-38 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}}