# RL1812A271K

**RUILON Shenzhen Ruilongyuan Elec** · Varistors · 1812

RL1812A271K from RUILON Shenzhen Ruilongyuan Elec, 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 | First terminal of the bidirectional, symmetrical varistor; RL1812A271K is rated 243~297 V varistor voltage at 1 mA, 175 Vac / 225 Vdc max allowable voltage, and 475 V max clamping at 400 A (8/20μs). |
| 2 | 2 | passive | Second terminal of the bidirectional, symmetrical varistor, interchangeable with the first; max energy 2.3 J (10/1000μs) and 10 A peak current rating (IP) per the electrical table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| Package | 1812 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `RL1812A271K`
- Footprint: `Resistor_SMD:R_1812_4532Metric`
- 3D model: 1812 (KiCad packages3D, STEP)
- 3D model files: `rl1812a271k-etched.step` / `rl1812a271k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl1812a271k.step` / `rl1812a271k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RUILON Shenzhen Ruilongyuan Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8771471801430097920) (5 pp, sha256 `61703208a13c9353`, retrieved 2026-10-09, 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/rl1812a271k-datasheet.pdf)