# RL1812A410K-142A

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

RL1812A410K-142A 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 | Varistor terminal 1 (end termination, WB 0.60±0.25 mm); bidirectional and symmetrical V/I characteristics, varistor voltage 36-45 V at 1 mA, max 30 Vdc / 21 Vac. |
| 2 | 2 | passive | Varistor terminal 2 (end termination, WB 0.60±0.25 mm); interchangeable with terminal 1, max clamping voltage 72 V at 1400 A (8/20μs). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RUILON Shenzhen Ruilongyuan Elec |
| 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 |
|---|---|---|---|---|---|---|---|
| Varistor Voltage (V1mA) | V1mA | 36 | 41 | 45 | V |  | 1 |
| Standard Tolerance (part-number code K) |  | -10 |  | 10 | % |  | 1 |
| Max. Allowable Voltage (AC) | VAC |  |  | 21 | V |  | 1 |
| Max. Allowable Voltage (DC) | VDC |  |  | 30 | V |  | 1 |
| Max. Energy (10/1000μs) |  |  |  | 3.6 | J | 10/1000μs | 1 |
| Max. Clamping Voltage | VC |  |  | 72 | V | 8/20μs | 1 |
| Max. Withstanding Surge Current | I |  |  | 1400 | A | 8/20μs | 1 |
| Leakage Current | IL |  |  | 30 | μA |  | 1 |
| Operating Temperature Range |  | -55 |  | 125 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `RL1812A410K-142A`
- Footprint: `Resistor_SMD:R_1812_4532Metric`
- 3D model: 1812 (KiCad packages3D, STEP)
- 3D model files: `rl1812a410k-142a-etched.step` / `rl1812a410k-142a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rl1812a410k-142a.step` / `rl1812a410k-142a.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/8602940548533796864) (4 pp, sha256 `2178ef941f5bbf92`, 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/rl1812a410k-142a-datasheet.pdf)