# 0440002.WRA

**Littelfuse** · Disposable Fuses · 1206

0440002.WRA from Littelfuse, in a 1206. 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 | One termination (Ag/Ni/Sn) of the non-polarized fuse; 2 A rated, 32 V max, 50 A interrupting rating at 32VAC/DC, nominal resistance 0.0385 ohm. |
| 2 | 2 | passive | Other termination (Ag/Ni/Sn) of the non-polarized fuse, electrically interchangeable with the first; carries 2 A rated current for 4 hours minimum and opens in 5 s maximum at 350% of rating. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Opening time at 100% of rated current (minimum) |  | 4 |  |  | hours | 100% of ampere rating, 1.75A - 8A range, at 25ºC, minimum | 1 |
| Opening time at 350% of rated current (maximum) |  |  |  | 5 | s | 350% of ampere rating, 1.75A - 8A range, at 25ºC, maximum | 1 |
| Operating temperature |  | -55 |  | 150 | °C |  | 1 |
| Max. voltage rating |  |  |  | 32 | V | Amp code 002. (2A) row | 1 |
| Interrupting rating (AC/DC) |  |  |  | 50 | A | 50A @ 32VAC/DC, 2A row | 1 |
| Continuous operation recommended current |  |  |  | 80 | % of rated current | Recommended continuous operation, no more than 80% rated current | 1 |
| Ampere rating |  |  | 2 |  | A | Amp code 002. (0440002.) | 1 |
| Nominal resistance |  |  | 0.0385 |  | Ohms | Measured with <10% rated current | 1 |
| Nominal melting I2t |  |  | 0.4326 |  | A2Sec. | Measured at 1msec. opening time | 1 |
| Nominal voltage drop at rated current |  |  | 0.0792 |  | V | Measured at rated current after temperature has stabilized | 1 |
| Nominal power dissipation at rated current |  |  | 0.158 |  | W | At rated current | 1 |
| Reflow peak temperature | TP |  |  | 260 | °C | Pb-free reflow; printed 260+0/-5 °C; do not exceed 260°C | 2 |
| Wave soldering temperature |  |  |  | 260 | °C | Wave soldering, 10 seconds max | 2 |
| Wave soldering time |  |  |  | 10 | s | Wave soldering at 260°C | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass | 3 |

## CAD (KiCad official)

- Symbol: `0440002.WRA`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0440002-wra-etched.step` / `0440002-wra-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0440002-wra.step` / `0440002-wra.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588903822597238784) (3 pp, sha256 `1483cc8fb8ea4fd4`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (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/0440002-wra-datasheet.pdf)