# Electromagnetic relay

An exposed coil pulls a hinged armature into one or two contact sets. Normally-open and normally-closed modes invert the contact result without changing the mechanism.

> For the complete index, see [llms.txt](https://robocn.dev/llms.txt). A Markdown version of any page is available by appending `.md` to its URL or by sending an `Accept: text/markdown` header.

## Install

```bash
bunx --bun shadcn@latest add https://robocn.dev/r/electromagnetic-relay.json
```

Registry item: `electromagnetic-relay` · [`https://robocn.dev/r/electromagnetic-relay.json`](https://robocn.dev/r/electromagnetic-relay.json)

## Notes

- The armature and contacts are geometric. Field loops are qualitative; the component does not model contact bounce, current, voltage, force or heating.

## Usage

```tsx
import { ElectromagneticRelay } from "@/components/ui/electromagnetic-relay"

<ElectromagneticRelay behavior="switch" poles={2} view="iso" />
<ElectromagneticRelay energized={1} normally="closed" />
```

## Props

| name | type | default | description |
| --- | --- | --- | --- |
| `energized` | `number` | — | Controlled coil energy from 0 released to 1 pulled. |
| `behavior` | `"switch" | "pulse" | "static"` | `"switch"` | Automatic armature motion when energized is omitted. |
| `poles` | `1 | 2` | `1` | One or two switched contact sets. |
| `normally` | `"open" | "closed"` | `"open"` | Contact state with the coil released. |
| `interactive` | `boolean` | `false` | Drag, arrow-key or toggle the armature. |
| `onEnergizedChange` | `(energized: number) => void` | — | Reports pointer and keyboard changes. |
| `showField` | `boolean` | `true` | Show qualitative activation loops around the coil. |
| `view` | `"plan" | "front" | "profile" | "iso"` | `"profile"` | Where the camera stands. One relay, four projections: straight down, straight on, side elevation, or three-quarter from above. |
| `animate` | `boolean` | `true` | Off parks the machine at phase and stops rendering. A reduced-motion preference does the same. |
| `paused` | `boolean` | `false` | Freeze where it stands. |
| `phase` | `number` | `0` | Seconds of offset, so a row of machines breaks step. |
| `variant` | `"solid" | "outline" | "blueprint" | "wire"` | `"solid"` | How the machine is painted. Geometry never changes between variants. |
| `size` | `"xs" | "sm" | "md" | "lg" | "xl" | number` | `"md"` | Rendered width in pixels, or a step on the scale. |
| `color` | `string` | `var(--robot-shell)` | Body panels — the colour the machine reads as. |
| `accent` | `string` | `var(--robot-accent)` | Status colour: tip light, live tool, readouts. |
| `metal` | `string` | `var(--robot-metal)` | Bare machined parts: collars, bolts, tool bodies. |
| `dark` | `string` | `var(--robot-dark)` | Cast joints, base, shadow side. |
| `palette` | `Partial<RobotPalette>` | — | Override any subset of roles at once, including glow and grid. |

## Source

- `src/components/ui/electromagnetic-relay.tsx`