{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L012/48WR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L012-48WR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L012-48WR","factsUrl":"https://icboms.com/api/mcp/products/1206L012%2F48WR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE® 1206L series, Polymeric PTC Resettable Fuse, 1206L012/48WR, 125 mA hold current, 48 V max, 10 A max current, 200 ms trip time, 1206 (3216 Metric) Concave package, Surface Mount.","salesMarkdown":"## What the hold and trip ratings mean for your circuit The 1206L012/48WR is a polymeric PTC resettable fuse from the POLY-FUSE 1206L series, rated for a hold current of 125 mA at 48 V max. At room temperature, the device will not trip below 125 mA continuous; once the fault current exceeds the trip current of 290 mA, the polymer heats up and the resistance jumps from a minimum of 1.5 ohms to a maximum of 6 ohms within 200 ms, effectively limiting the current to a low level. The 10 A max current rating is the fault current the part can withstand without damage during the trip event — it is not a continuous rating. For a 125 mA nominal load, a short-circuit current of up to 10 A at 48 V will be safely interrupted, and the fuse resets when power is removed and the polymer cools. The concave termination style provides a visible solder fillet on the side of the package, aiding inspection. Operating temperature range is -40°C to 85°C, which covers most indoor and outdoor telecom, industrial, and automotive cabin environments. The hold current derates with temperature — at 85°C the effective hold current is lower than the 25°C rating, so the circuit designer must apply the manufacturer's derating curve. ## Approvals and compliance The 1206L012/48WR carries cURus and TUV approvals, confirming it meets North American and European safety standards for overcurrent protection components. These marks are required for equipment sold into those regulated markets.","metaTitle":"Littelfuse 1206L012/48WR PTC Resettable Fuse, 125 mA Hold","metaDescription":"Littelfuse 1206L012/48WR POLY-FUSE polymeric PTC resettable fuse, 125 mA hold current, 48V max, 1206 concave package. Active production. cURus, TUV approved.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Polymeric","Series":"POLY-FUSE®, 1206L","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"200 ms","Current - Max":"10 A","Mounting Type":"Surface Mount","Voltage - Max":"48V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.049\\\" (1.25mm)","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.065\\\" W (3.20mm x 1.65mm)","Current - Trip (It)":"290 mA","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"125 mA","Resistance - Initial (Ri) (Min)":"1.5 Ohms","Resistance - Post Trip (R1) (Max)":"6 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5700","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b8fc92bc33c264d26251f523f168bfed.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the hold current and trip current of 1206L012/48WR?","answer":"The hold current (Ih) is 125 mA maximum, and the trip current (It) is 290 mA. The device will not trip below 125 mA continuous; above 290 mA it will trip within 200 ms."},{"question":"What approvals does 1206L012/48WR carry?","answer":"It carries cURus and TUV approvals, covering North American and European safety standards for overcurrent protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L012-48WR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L012-48WR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}