# SDM01 Combo

{% hint style="info" %}
 **Applies to:** SDM01 Combo | **Hardware Revision:** V1.0+ | **Last Updated:** 2026-05-13
{% endhint %}

### 1.  Introduction

<div align="left"><figure><img src="/files/pilWYjz17BZDmT9Z3nXq" alt=""><figcaption></figcaption></figure></div>

The **SDM01 Combo Compact Energy Meter** is a compact 18mm-wide DIN-rail device for real-time three-phase and multi-branch single-phase monitoring. With three split-core CTs, it precisely measures voltage, current, power, and energy, supporting wired and wireless communication for seamless integration.

#### Product Highlights

* **Bi-directional Measurement**: Measure power and energy flow in both consumption and generation.
* **Easy Installation**: The monitoring module requires just 1MW at DIN rail, paired with compact split-core CTs.
* **Local Automation**: Enable a wide range of local APIs, ideal for DLB and zero export for Home Energy Management Systems (HEMS).
* **Real-time Monitoring**: Monitor key electrical data like Voltage, Current, and Power in real time.
* **Versatile Connectivity**: Choose from various communication options such as Wi-Fi, Zigbee, Modbus, etc., catering to diverse system integration needs.
* **Modbus Support**: Modbus version & hybrid WiFi/Zigbee+Modbus variants are available for industrial installations.

#### Typical Application

* Home energy management systems (HEMS)
* energy management systems (EMS) for small business&#x20;
* Energy management systems (EMS) for buildings, Infrastructure, and Industry
* Dynamic load balancing (DLB) for electrical vehicle charging
* Export limitation for renewable power generation

***

### 2. Part Description

<figure><img src="/files/LeE9sv2rWxh5U7Jm76aV" alt=""><figcaption></figcaption></figure>

<table data-header-hidden><thead><tr><th width="84.5555419921875">#</th><th width="257.666748046875">Element</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>Connector for voltage take-offs connection</td><td>The monitor is powered by AC power supply and measures voltage through four cables: X, Y, Z, and N</td></tr><tr><td>2</td><td>Connector for current transformer connection</td><td>The Red (+) and Black (-) wires of CT(X), CT(Y), and CT(Z) must match the corresponding polarity of the connector.</td></tr><tr><td>3</td><td>Connector for RS485 communication</td><td>For Modbus RTU communication</td></tr><tr><td>4</td><td>Reset button</td><td>Press and hold for 3–5 seconds to enter pairing mode.</td></tr><tr><td>5</td><td>Status LED (ACT)</td><td>Indicates device operation and network status through different flashing patterns.</td></tr><tr><td>6</td><td>Alarm LED (AL)</td><td>Flashes to indicate system alarms or errors.</td></tr><tr><td>7</td><td>Product QR code</td><td>Contains manufacturing batch information.</td></tr><tr><td>8</td><td>Product model</td><td>See “Ordering Information” section for product selection</td></tr><tr><td>9</td><td>Locking clip for DIN rail mounting</td><td>Mounts onto a 35mm DIN rail.</td></tr><tr><td>10</td><td>Calibration ID </td><td>The calibration ID on the split-core CT must match the one on the monitor for optimal accuracy.</td></tr><tr><td>11</td><td>Split-core CT locking clasp</td><td>Ensure the clasp is securely locked for precise measurement.</td></tr><tr><td>12</td><td>Positive power flow direction</td><td>Indicates positive power flow direction for CT(X), CT(Y), and CT(Z) installation.</td></tr></tbody></table>

***

### 3. Technical Data

<table data-header-hidden><thead><tr><th width="342"></th><th></th></tr></thead><tbody><tr><td>Rated operating voltage <em>U</em><sub>n</sub></td><td>~220-240 VAC phase to neutral, 50/60 Hz<br>~380-415 VAC phase to phase, 50/60 Hz<sup>1)</sup></td></tr><tr><td>Max current <em>I</em><sub>max</sub></td><td>120A / 200A</td></tr><tr><td>Over-voltage category</td><td>III</td></tr><tr><td>Rated insolating voltage <em>U</em><sub>i</sub></td><td>440V</td></tr><tr><td>Rated impulse withstand voltage <em>U</em>imp</td><td>4kV</td></tr><tr><td>Pollution degree</td><td>3</td></tr><tr><td>Protection degree</td><td>IP20</td></tr><tr><td>Energy measurement accuracy</td><td>Class 1 (IEC 61557-12)</td></tr><tr><td>Maximum Power consumption</td><td>≤ 2VA</td></tr><tr><td>Rated operating temperature</td><td>-25℃ to 55℃</td></tr><tr><td>Main module dimension</td><td>113.7×18.0×65.9mm</td></tr><tr><td>Clamp CT apertures</td><td>Ø16mm / Ø20mm</td></tr><tr><td>Communication Type</td><td>Wireless<sup>2)</sup>: BLE; Wi-Fi; Zigbee<br>Wired: RS485</td></tr></tbody></table>

**Remark:**\
1\) Not suitable for 3P3W installation.

2\) Four variants of main module available with different connectivity - Tuya WiFI (SDM01-TWM-\*), Tuya Zigbee (SDM01-TZM-\*), Open WiFI (SDM01-EWM-\*), Standard Zigbee 3.0 (SDM01-TZM-\*-U01)

***

### 4. Mechanical Outline

* **Dimension:** Unit in mm
* **Main Unit:** Monitoring module for DIN-rail installation (18mm width)

<figure><img src="/files/oq6R0l94drelqUmTxecJ" alt=""><figcaption></figcaption></figure>

* **Split-core Current Transformer - 120A (CT Clamp - 120A):**

<figure><img src="/files/AOGOd1fsWOHrnj1rKSfo" alt=""><figcaption></figcaption></figure>

* **Split-core Current Transformer - 200A (CT Clamp - 200A):**

<figure><img src="/files/ZEjMHmD1tkqhS01q9tod" alt=""><figcaption></figcaption></figure>

***

### 5. Electrical Installation&#x20;

#### Wiring Diagram

**⚠️ Safety Remarks:**

* The device must be associated with easily accessible upstream protective devices ‒ such as miniature circuit breakers (MCB).
* The device must be installed, operated, serviced, and maintained **ONLY** by qualified professionals.
* Please read the user guide carefully before installation for detailed wiring diagrams and safety precautions.

<p align="center"><strong>Three-phase (3P4W) System Wiring</strong></p>

<figure><img src="/files/dPRq7danwKJZqNWOOwyj" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Single-phase System Wiring up to 3 Branch Circuits</strong></p>

<figure><img src="/files/mnN8MN0CkbIWcEc7D1EB" alt=""><figcaption></figcaption></figure>

**Note:** Naming conventions for three-phase systems vary by region (e.g., L1, L2, L3 in Europe vs. A, B, C in China). Additionally, this product supports monitoring three independent branch circuits in a single-phase system. Therefore, the terminals are universally labeled as **Lx, Ly, and Lz**.

#### Installation Video

{% embed url="<https://youtu.be/t6z_me6g-GM>" %}

***

### 6. User Interface

#### Reset Button

Press and hold for 3–5 seconds to enter pairing mode.

#### LED Indicator<br>

{% tabs %}
{% tab title="Tuya WiFi " %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Solid ON</strong></td><td>Device connected - the device is online and functioning normally with cloud connectivity.</td><td data-object-fit="contain"><a href="/files/C5FEHNWsbPZP5rckGS1b">/files/C5FEHNWsbPZP5rckGS1b</a></td></tr><tr><td><strong>Flashing at 2Hz</strong></td><td>Pairing mode – press and hold the reset button until the LED flashes rapidly.</td><td data-object-fit="contain"><a href="/files/UDRrPdkWrUAVixAXjdEG">/files/UDRrPdkWrUAVixAXjdEG</a></td></tr><tr><td><strong>Flashing at 0.5Hz</strong></td><td>Reconnecting to network - the device is attempting to reconnect using saved network settings.</td><td data-object-fit="contain"><a href="/files/nLck53YzFwgnN5tQDVem">/files/nLck53YzFwgnN5tQDVem</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.</td><td data-object-fit="contain"><a href="/files/KoGTMWOgrHVv6oVEMzOL">/files/KoGTMWOgrHVv6oVEMzOL</a></td></tr><tr><td><strong>Flashing at 0.25Hz</strong></td><td>The device failed internal self-check. Please power off, restart, and reconfigure the network settings.</td><td data-object-fit="contain"><a href="/files/SvxArPUlrbQEM1ynt8T1">/files/SvxArPUlrbQEM1ynt8T1</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Alarm reminder -<br>The device has detected a fault. Please check the wiring and power supply.</td><td data-object-fit="contain"><a href="/files/hQssYFp5MZDAzBSM2MG9">/files/hQssYFp5MZDAzBSM2MG9</a></td></tr></tbody></table>
{% endtab %}

{% tab title="Tuya Zigbee" %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Solid ON</strong></td><td>Device connected - the device is online and functioning normally with cloud connectivity.</td><td data-object-fit="contain"><a href="/files/C5FEHNWsbPZP5rckGS1b">/files/C5FEHNWsbPZP5rckGS1b</a></td></tr><tr><td><strong>Flashing at 2Hz</strong></td><td>Pairing mode – press and hold the reset button until the LED flashes rapidly.</td><td data-object-fit="contain"><a href="/files/UDRrPdkWrUAVixAXjdEG">/files/UDRrPdkWrUAVixAXjdEG</a></td></tr><tr><td><strong>Flashing at 0.5Hz</strong></td><td>Reconnecting to network - the device is attempting to reconnect using saved network settings.</td><td data-object-fit="contain"><a href="/files/nLck53YzFwgnN5tQDVem">/files/nLck53YzFwgnN5tQDVem</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.</td><td data-object-fit="contain"><a href="/files/KoGTMWOgrHVv6oVEMzOL">/files/KoGTMWOgrHVv6oVEMzOL</a></td></tr><tr><td><strong>Flashing at 0.25Hz</strong></td><td>The device failed internal self-check. Please power off, restart, and reconfigure the network settings.</td><td data-object-fit="contain"><a href="/files/SvxArPUlrbQEM1ynt8T1">/files/SvxArPUlrbQEM1ynt8T1</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Alarm reminder -<br>The device has detected a fault. Please check the wiring and power supply.</td><td data-object-fit="contain"><a href="/files/hQssYFp5MZDAzBSM2MG9">/files/hQssYFp5MZDAzBSM2MG9</a></td></tr></tbody></table>
{% endtab %}

{% tab title="Standard Zigbee 3.0" %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Solid ON</strong></td><td>Zigbee connected, BLE disconnected – the device is connected to a Zigbee network while BLE is turned off or not connected.</td><td data-object-fit="contain"><a href="/files/C5FEHNWsbPZP5rckGS1b">/files/C5FEHNWsbPZP5rckGS1b</a></td></tr><tr><td><strong>Flashing at 2Hz</strong></td><td>Pairing mode – press and hold the reset button until the LED flashes rapidly.</td><td data-object-fit="contain"><a href="/files/UDRrPdkWrUAVixAXjdEG">/files/UDRrPdkWrUAVixAXjdEG</a></td></tr><tr><td><strong>Flashing at 0.5Hz</strong></td><td>Reconnecting to network - the device is attempting to reconnect both BLE (if available) and Zigbee using saved settings.</td><td data-object-fit="contain"><a href="/files/nLck53YzFwgnN5tQDVem">/files/nLck53YzFwgnN5tQDVem</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>BLE connected(if available)  - the LED flashes at 1Hz whenever BLE is connected, regardless of Zigbee status.</td><td data-object-fit="contain"><a href="/files/KoGTMWOgrHVv6oVEMzOL">/files/KoGTMWOgrHVv6oVEMzOL</a></td></tr><tr><td><strong>Flashing at 0.25Hz</strong></td><td>The device failed internal self-check. Please power off, restart, and reconfigure the network settings.</td><td data-object-fit="contain"><a href="/files/SvxArPUlrbQEM1ynt8T1">/files/SvxArPUlrbQEM1ynt8T1</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>The device has detected a fault. Please check the wiring and power supply.</td><td data-object-fit="contain"><a href="/files/hQssYFp5MZDAzBSM2MG9">/files/hQssYFp5MZDAzBSM2MG9</a></td></tr></tbody></table>
{% endtab %}

{% tab title="Open WiFi" %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Solid ON</strong></td><td>Wi-Fi connected, BLE disconnected - the device is connected to Wi-Fi while BLE is disconnected.</td><td data-object-fit="contain"><a href="/files/C5FEHNWsbPZP5rckGS1b">/files/C5FEHNWsbPZP5rckGS1b</a></td></tr><tr><td><strong>Flashing at 2Hz</strong></td><td>Pairing mode – press and hold the reset button until the LED flashes rapidly.</td><td data-object-fit="contain"><a href="/files/UDRrPdkWrUAVixAXjdEG">/files/UDRrPdkWrUAVixAXjdEG</a></td></tr><tr><td><strong>Flashing at 0.5Hz</strong></td><td>Reconnecting to network - the device is attempting to reconnect both BLE and Wi-Fi using saved settings.</td><td data-object-fit="contain"><a href="/files/nLck53YzFwgnN5tQDVem">/files/nLck53YzFwgnN5tQDVem</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>BLE connected - the LED flashes at 1Hz whenever BLE is connected, regardless of Wi-Fi status.</td><td data-object-fit="contain"><a href="/files/KoGTMWOgrHVv6oVEMzOL">/files/KoGTMWOgrHVv6oVEMzOL</a></td></tr><tr><td><strong>Flashing at 0.25Hz</strong></td><td>The device failed internal self-check. Please power off, restart, and reconfigure the network settings.</td><td data-object-fit="contain"><a href="/files/SvxArPUlrbQEM1ynt8T1">/files/SvxArPUlrbQEM1ynt8T1</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Alarm reminder -<br>The device has detected a fault. Please check the wiring and power supply.</td><td data-object-fit="contain"><a href="/files/hQssYFp5MZDAzBSM2MG9">/files/hQssYFp5MZDAzBSM2MG9</a></td></tr></tbody></table>
{% endtab %}
{% endtabs %}

***

### 7. System Integration

#### Wireless communication

Products equipped with different communication SoC firmwares connect to different systems and cloud platforms. Users can select the appropriate version based on their specific application requirements.

{% tabs %}
{% tab title="Tuya WiFi " %}
The Tuya WiFi version can only be integrated into the Tuya Cloud using Tuya's encrypted MQTT communication. It cannot be directly integrated with any third-party cloud platforms, ecosystems, or gateways. Third-party clouds or edge gateways need to be integrated via Tuya cloud APIs. For details, please refer to Tuya's developer documentation.

**Note:**&#x20;

1. Tuya's strategy for adjusting the cloud data reporting frequency is not fully disclosed. Based on the latest updates as of April 2026, provided the daily data reporting traffic limit is not exceeded, the fastest expected reporting interval will be between 5 to 15 minutes.
2. Tuya's Smart Life App is user-friendly and straightforward, making it ideal for entry-level smart home users who prefer simplicity and basic energy consumption monitoring.
   {% endtab %}

{% tab title="Tuya Zigbee" %}
For standard operation, the Tuya Zigbee version must be integrated with a Tuya gateway, which then connects to the Tuya Cloud via Tuya's encrypted MQTT communication.

**Note:**&#x20;

1. Tuya's strategy for adjusting the cloud data reporting frequency is not fully disclosed. Based on the latest updates as of April 2026, provided the daily data reporting traffic limit is not exceeded, the fastest expected reporting interval will be between 5 to 15 minutes.
2. There are unofficial methods available on the market to integrate Tuya Zigbee products with third-party gateways or hubs - such as Home Assistant integration via Zigbee2MQTT. However, please be aware of the following potential issues when using these unofficial integration methods:

* **⚠️Network Congestion:** Tuya's proprietary Zigbee data transmission strategy does not bundle data packets. Consequently, high-frequency reporting of the extensive electrical data types from several energy meters, which generate significantly more data than typical smart home Zigbee devices, can easily cause Zigbee network congestion.
* **⚠️Security Risks:** Integrating with third-party Zigbee gateways using the default global Trust Centre Link Key “*ZigbeeAlliance09*” poses potential information security risks. Therefore, using non-Tuya gateways in commercial projects is highly discouraged. For third-party gateway integration, the **Standard Zigbee 3.0** version with Install Code is strongly recommended.
  {% endtab %}

{% tab title="Standard Zigbee 3.0" %}
The Standard Zigbee 3.0 version can seamlessly connects to third-party gateways. Thanks to the standardized application-layer integration of Zigbee 3.0, it is highly convenient and widely applicable for both residential and commercial building projects.

Currently supported smart home ecosystems include:

* **Home Assistant:** Integration via Zigbee2MQTT ([SPM01](https://www.zigbee2mqtt.io/devices/SPM02-U01.html#bituo-technik-spm02-u01), [SPM02](https://www.zigbee2mqtt.io/devices/SPM02-U01.html#bituo-technik-spm02-u01), [SDM01](https://www.zigbee2mqtt.io/devices/SDM01W-U01.html#bituo-technik-sdm01w-u01), and [SDM02](https://www.zigbee2mqtt.io/devices/SDM02-U01.html#bituo-technik-sdm02-u01))
* **SmartThings:** Integration via the SmartThings Hub driver (officially approved).
* **Homey:** Integration via the [Bituo Technik App ](https://homey.app/en-us/app/com.bituotechnik.iot/BITUO-TECHNIK/)

**You can find information about the commonly used Zigbee Cluster Library on** [**this page**](https://bituo-technik.gitbook.io/hc/device-api/zigbee/spm-sdm-zigbee-profile)**.**
{% endtab %}

{% tab title="Open WiFi" %}
The Open Wi-Fi version of SDM01 provides the following open APIs (refer to the Device API document), enabling users to implement local automation and connect to custom cloud platforms.

1. **Zero-Configuration Discovery Mechanism (LAN Addressing)**
   * **mDNS / DNS-SD:** Supports automatic discovery of the energy meter by EV chargers and PV inverters on the Local Area Network (LAN) without the need for IP scanning.
2. **BLE Near-Field Communication Mode (Offline/Maintenance)**
   * **BLE GATT (Time-limited activation):** Requires PIN code + PAKE algorithm authentication for local high-privilege configuration and network resets. Wakes up on demand and closes upon timeout.
   * **BLE Broadcast (Always-on 24/7):** Unidirectional broadcast of AES-encrypted real-time power data, allowing nearby low-power devices to listen with zero latency and without requiring a connection.
3. **LAN Standard Mode (Ultra-low Latency Device Communication)** *Plaintext or lightweight encryption for local networks.*
   * **Modbus TCP:** Used for local linkage with EV chargers and PV inverters.
   * **Local MQTT:** Used for local integration with open-source smart home ecosystems.
   * **WebSocket (WS) / Raw UDP:** Ultra-high frequency real-time power streaming subscription (enables DLB completion within 1-2 seconds).
   * **HTTP / CoAP:** Suitable for low-frequency parameter configuration and status queries.
4. **Cloud Device Access Layer (Device-to-Cloud / Southbound API)**
   * **MQTTS (MQTT over TLS 1.2/1.3):** Core main communication link.
   * **HTTPS (OTA dedicated):** Exclusively used for downloading large Over-The-Air (OTA) firmware upgrade packages.
     {% endtab %}
     {% endtabs %}

#### Wired communication

SDM01 provides a Modbus RTU over RS485 interface, making it convenient to use as a wired Modbus RTU meter. You can view the Modbus RTU register address information by clicking the page below.

{% content-ref url="/pages/cIwsN5OFt26gvjZMt9c1" %}
[SDM01 Modbus RTU Map](/device-api/sdm01-modbus-rtu-map.md)
{% endcontent-ref %}

***

### 8. Ordering Information

{% tabs %}
{% tab title="Tuya Wi-Fi" %}

<table><thead><tr><th width="75.7777099609375">#</th><th width="176.6666259765625">Ordering number</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>SDM01-TWM-12</td><td>SDM01 SCTA-3×120A/Φ16 Wi-Fi (Tuya)+RS485</td></tr><tr><td>2</td><td>SDM01-TWM-20</td><td>SDM01 SCTA-3×200A/Φ20 Wi-Fi (Tuya)+RS485</td></tr><tr><td>3</td><td>SDM01-TWM-12TS</td><td>SDM01 SCTA-3×120A/Φ16 Wi-Fi (Tuya LAN+)+RS485</td></tr><tr><td>4</td><td>SDM01-TWM-20TS</td><td>SDM01 SCTA-3×200A/Φ20 Wi-Fi (Tuya LAN+)+RS485</td></tr></tbody></table>

1\) Tuya LAN+: Tuya LAN+ is a specific Wi-Fi SoC firmware provided by Tuya Smart that features local area network (LAN) communication. It is suitable for local LAN communication with products such as EV chargers, microinverters, and micro-energy storage systems that are also equipped with Tuya LAN+ communication firmware. This model can only be purchased through Tuya's official or designated channels.
{% endtab %}

{% tab title="Tuya Zigbee" %}

<table><thead><tr><th width="69.8887939453125">#</th><th width="175.6666259765625">Ordering number</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>SDM01-TZM-12</td><td>SDM01 SCTA-3×120A/Φ16 Zigbee (Tuya)+RS485</td></tr><tr><td>2</td><td>SDM01-TZM-20</td><td>SDM01 SCTA-3×200A/Φ20 Zigbee (Tuya)+RS485</td></tr></tbody></table>
{% endtab %}

{% tab title="Standard Zigbee 3.0" %}

<table><thead><tr><th width="67.8887939453125">#</th><th width="186.6666259765625">Ordering number</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>SDM01-TZM-12-U01</td><td>SDM01 SCTA-3×120A/Φ16 Zigbee (Std. ZB3.0)+RS485</td></tr><tr><td>2</td><td>SDM01-TZM-20-U01</td><td>SDM01 SCTA-3×200A/Φ20 Zigbee (Std. ZB3.0)+RS485</td></tr></tbody></table>
{% endtab %}

{% tab title="Open WiFi " %}

<table><thead><tr><th width="72.8887939453125">#</th><th width="178.6666259765625">Ordering number</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>SDM01-EWM-12</td><td>SDM01 SCTA-3×120A/Φ16 Wi-Fi (ESP-8685)+RS485</td></tr><tr><td>2</td><td>SDM01-EWM-20</td><td>SDM01 SCTA-3×200A/Φ20 Wi-Fi (ESP-8685)+RS485</td></tr></tbody></table>

{% endtab %}
{% endtabs %}

***

### 9. FAQ&#x20;

{% content-ref url="/pages/149DFxm5iomFCS9alhv5" %}
[FAQ](/faq/overview.md)
{% endcontent-ref %}

***

### 10. Troubleshooting

{% content-ref url="/pages/td5Nnli4rm9AAhvTaYLk" %}
[Troubleshooting](/troubleshooting/overview.md)
{% endcontent-ref %}

***

### 11. Printed User Guide

{% file src="/files/ceZ4z84pGXUzF1ExKRsn" %}

### 12. Explore More


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