0407004.WR

Littelfuse · Disposable Fuses · 1206

0407004.WR 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	Terminal 1 of an unpolarised fuse; either orientation.
2	2	passive	Terminal 2 of an unpolarised fuse; either orientation.

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	Min	Typ	Max	Unit	Conditions	Page
Opening time at 100% of ampere rating (4 A part)	4			hours	100% of ampere rating, at 25ºC; 1A-8A series	1
Opening time at 200% of ampere rating (4 A part)	1		120	sec	200% of ampere rating, at 25ºC; 1A-8A series (max is 120 secs)	1
Opening time at 300% of ampere rating (4 A part)	0.1		3	sec	300% of ampere rating, at 25ºC; 1A-8A series (max is 3 secs)	1
Opening time at 800% of ampere rating (4 A part)	0.002		0.05	sec	800% of ampere rating, at 25ºC; 1A-8A series (max is 0.05 secs)	1
Operating temperature	-55		150	ºC		1
Interrupting rating (AC/DC) for 4.00 A, 004. (32 V group)			50	A	50A@32VDC; AC tested at rated voltage with unity power factor; DC tested at rated voltage with time constant < 0.8 msec	2
Max. voltage rating (4.00 A, 004.)			32	V		2
Nominal resistance (4.00 A, 004.)		0.025		Ohms	measured with < 10% rated current	2
Nominal power dissipation at rated current (4.00 A, 004.)		0.56		W	at rated current	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% Leadfree) Element Cover Coating: Lead-free Glass	3

CAD (KiCad official)

Symbol: 0407004.WR
Footprint: Fuse:Fuse_1206_3216Metric
3D model: 1206 (KiCad packages3D, STEP)
3D model files: 0407004-wr-etched.step / 0407004-wr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 0407004-wr.step / 0407004-wr.glb are the bare package body.

Provenance

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

Datasheet: Littelfuse datasheet (4 pp, sha256 880b3d6222280844, retrieved 2026-10-19, 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

# 0407004.WR

**Littelfuse** · Disposable Fuses · 1206

0407004.WR 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 | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |

## 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 ampere rating (4 A part) |  | 4 |  |  | hours | 100% of ampere rating, at 25ºC; 1A-8A series | 1 |
| Opening time at 200% of ampere rating (4 A part) |  | 1 |  | 120 | sec | 200% of ampere rating, at 25ºC; 1A-8A series (max is 120 secs) | 1 |
| Opening time at 300% of ampere rating (4 A part) |  | 0.1 |  | 3 | sec | 300% of ampere rating, at 25ºC; 1A-8A series (max is 3 secs) | 1 |
| Opening time at 800% of ampere rating (4 A part) |  | 0.002 |  | 0.05 | sec | 800% of ampere rating, at 25ºC; 1A-8A series (max is 0.05 secs) | 1 |
| Operating temperature |  | -55 |  | 150 | ºC |  | 1 |
| Interrupting rating (AC/DC) for 4.00 A, 004. (32 V group) |  |  |  | 50 | A | 50A@32VDC; AC tested at rated voltage with unity power factor; DC tested at rated voltage with time constant < 0.8 msec | 2 |
| Max. voltage rating (4.00 A, 004.) |  |  |  | 32 | V |  | 2 |
| Nominal resistance (4.00 A, 004.) |  |  | 0.025 |  | Ohms | measured with < 10% rated current | 2 |
| Nominal power dissipation at rated current (4.00 A, 004.) |  |  | 0.56 |  | W | at rated current | 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% Leadfree) Element Cover Coating: Lead-free Glass | 3 |

## CAD (KiCad official)

- Symbol: `0407004.WR`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0407004-wr-etched.step` / `0407004-wr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0407004-wr.step` / `0407004-wr.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/8603134687745490944) (4 pp, sha256 `880b3d6222280844`, retrieved 2026-10-19, 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/0407004-wr-datasheet.pdf)