# K1210L050YR

**KUU** · Resettable Fuses · 1210

K1210L050YR from KUU, in a 1210. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1 | passive | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KUU |
| Package | 1210 |
| Category | Circuit Protection |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Maximum voltage (V max) |  |  |  | 13.2 | V |  | 1 |
| Maximum current (I max) |  |  |  | 40 | A |  | 1 |
| Minimum resistance (R min) | R min | 0.18 |  |  | Ω |  | 1 |
| Maximum resistance (R1 max) | R1 max |  |  | 0.9 | Ω |  | 1 |
| Hold current (IH) | IH |  | 0.5 |  | A | 25℃ | 1 |
| Trip current (IT) | IT |  | 1 |  | A |  | 1 |
| Time to trip |  |  | 0.1 |  | Sec. |  | 1 |
| Power dissipation (Pd) | Pd |  | 0.6 |  | W |  | 1 |
| Hold current vs ambient temperature | IH |  | 0.66 |  | A | ambient -20℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.58 |  | A | ambient 0℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.5 |  | A | ambient 25℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.42 |  | A | ambient 40℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.38 |  | A | ambient 50℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.35 |  | A | ambient 60℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.29 |  | A | ambient 70℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.23 |  | A | ambient 85℃ | 2 |
| Hold current vs ambient temperature | IH |  | 0.76 |  | A | ambient -40℃ | 2 |

## CAD (KiCad official)

- Symbol: `K1210L050YR`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `k1210l050yr-etched.step` / `k1210l050yr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `k1210l050yr.step` / `k1210l050yr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [KUU datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589041666279804928) (2 pp, sha256 `f1983841a4373ecd`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/k1210l050yr-datasheet.pdf)