> For the complete documentation index, see [llms.txt](https://docs.bituo-technik.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bituo-technik.com/product-document/srs-series.md).

# SRS Series

## SRS Series — Smart Relay Switches with Built-in Power Metering

Compact puck-style smart relay switches with integrated per-channel power monitoring. Designed for flush-mounted wall boxes and ceiling installations — no changes to existing switch panels required.

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2F6ZpNQ64FYzl4MVxj6vS6%2Fimgi_10_SRS01-and-02-Home-2_3%20(1).webp?alt=media&amp;token=7802c4b2-c35b-40e6-a606-502bd05762ff" alt=""><figcaption></figcaption></figure>

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### Product Variants

SRS products are defined across **two dimensions**:

#### 1. Channel Configuration

|                            | **SRS01 1PM**         | **SRS01 2PM**            |
| -------------------------- | --------------------- | ------------------------ |
| **Relay Channels**         | 1 × 16A               | 2 × 10A (max 16A total)  |
| **Power Monitoring**       | 1 channel             | 2 channels independently |
| **Rated Voltage**          | 110–240 VAC, 50/60 Hz | 110–240 VAC, 50/60 Hz    |
| **Type of Switching**      | Relay, Micro gap (μ)  | Relay, Micro gap (μ)     |
| **Dimension**              | 38 × 42 × 16 mm       | 38 × 42 × 16 mm          |
| **Active Energy Accuracy** | ±2%                   | ±2%                      |

#### 2. Connectivity

**Wireless** — select one variant per order:

<table><thead><tr><th width="116">Variant</th><th width="137">Communication</th><th width="235">Archetecture</th><th>API Style</th><th width="140">Typical Users</th></tr></thead><tbody><tr><td><strong>Tuya Wi-Fi</strong> (<code>*TW</code>)</td><td>Wi-Fi</td><td>BK7238 SoC (Tuya Firmware, Slave) + Metering MCU (Bituo Firmware, Master)</td><td>MQTT(Tuya Proprietary)</td><td>Tuya ecosystem, IoT beginners</td></tr><tr><td><strong>Std. Zigbee</strong> (<code>*TZ-U01</code>)</td><td>Zigbee 3.0</td><td>EFR32MG21 SoC (Bituo Firmware, Master) + Metering MCU (Bituo Firmware, Slave)</td><td>Standard Zigbee 3.0 Clusters</td><td>System Integrators, DIYers</td></tr></tbody></table>

> ℹ️ Open Wi-Fi and Tuya Zigbee versions are not currently offered for SRS — no suitable modules of sufficient compact size is available for this form factor at this time.

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### Sub Pages

<table><thead><tr><th width="186">Model</th><th>Description</th></tr></thead><tbody><tr><td><a data-mention href="/product-document/srs-series/srs01-1pm.md">SRS01-1PM</a></td><td>Single-channel, 16A, with power monitoring</td></tr><tr><td><a data-mention href="/product-document/srs-series/srs01-2pm.md">SRS01-2PM</a></td><td>Dual-channel, 2×10A, with independent per-channel monitoring</td></tr></tbody></table>

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