# K1812L300DR

**KUU** · Resettable Fuses · 1812

K1812L300DR from KUU, in a 1812. 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 | 1812 |
| 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 |
|---|---|---|---|---|---|---|---|
| R min (minimum resistance, Ω column) | R min | 0.012 |  |  | Ω |  | 1 |
| R1 max (maximum resistance, R1 column) | R1 |  |  | 0.06 | Ω |  | 1 |
| Maximum voltage (V max) | Vmax |  |  | 6 | V |  | 1 |
| Maximum current (I max) | Imax |  |  | 100 | A |  | 1 |
| Maximum operating time (Sec. column) |  |  |  | 5 | s |  | 1 |
| Hold current (IH) | IH |  | 3 |  | A |  | 1 |
| Trip current (IT) | IT |  | 6 |  | A |  | 1 |
| Power dissipation (Pd typ) | Pd |  | 1.2 |  | W |  | 1 |

## CAD (KiCad official)

- Symbol: `K1812L300DR`
- Footprint: `Fuse:Fuse_1812_4532Metric`
- 3D model: 1812, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal _1806_ height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `k1812l300dr-etched.step` / `k1812l300dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `k1812l300dr.step` / `k1812l300dr.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/8588944099554967552) (3 pp, sha256 `b3fbc50fa7279685`, retrieved 2026-10-16, 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/k1812l300dr-datasheet.pdf)