SPM01 MCBM
1. Introduction
The SPM01 Miniature Energy Meter (MCB-mounting version) is specifically designed for seamless integration with miniature circuit breakers (MCBs). It ensures easy and efficient energy monitoring within existing electrical systems, delivering real-time data and precise measurement.
Product Highlights
Space saving: Installs easily into new or existing distribution boards without occupying DIN-rail space, perfect for crowded panels
Real-time Monitoring: Measures Voltage, Current, Power and Power Factor in real-time to help users optimize energy usage.
Large Aperture: Supports cables up to 16mm² with a 9.6mm aperture, enabling measurement up to 63A.
Precise Measurement: Delivers accurate active energy measurements with a tolerance of 1%, ensuring precise monitoring of energy consumption.
Seamless Connectivity: Supports Wi-Fi, Zigbee, and BLE, offering a range of connectivity options for integration into home or industrial energy management systems.
Typical Applications
Energy management systems (EMS) for home and small business
Energy management systems (EMS) for buildings, Infrastructure, and Industry
2. Part Description
1
Terminal plate for L connection
Insert to protective device terminal box for power supply from Line1)
2
Cable for Neutral (N) connection
Connect to power supply from Neutral
3
Through-hole for L wire
Through-hole for L wire: Ensure the wire(L) passes through the hole.
4
Reset button
Press the button above 5 seconds to enter the pairing mode
5
LED indicator
Shows device operation and network status through different flashing patterns.2)
6
Current flow direction
Indicates forward / positive power flow for installation
7
Product model
Refer to the 'Ordering Information' section for product selection.
Remark:
1) The manufacturer has only verified the compatibility of SPM01 MCBM with Siemens 5SY/5SL series, including tests on wiring capacity, thermal performance, and mechanical fit etc. The flexible version is recommended if you are unsure about MCB-mounting compatibility with your circuit breakers.
2) Refer to the user guide of your selected models for detailed LED status indicators.
3. Technical Data
Rated operating voltage Un
220-240 VAC, 50/60Hz
Max monitoring current Imax
63 A
Over-voltage category
III
Rated insolating voltage Ui
250V
Rated impulse withstand voltage Uimp
4kV
Pollution degree
3
Protection degree
IP20
Energy measurement accuracy
±1%
Maximum power consumption
≤ 2VA
Rated operating temperature
-25°C to 55°C
Size: Height x Width x Depth
46.8mm x 17.8mm x 21.3mm
Integrated communication option1)
BLE; WiFi; Zigbee
4. Mechanical Outline
Dimension: Unit in mm
5. Electrical Installation
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.
The manufacturer has only verified the compatibility of SPM01 MCBM with Siemens 5SY/5SL series, including tests on wiring capacity, thermal performance, and mechanical fit etc. The flexible version is recommended if you are unsure about MCB-mounting compatibility with your circuit breakers.
Downstream Installation
Upstream Installation
Forward Energy Calculation: The energy flowing in the same direction as the energy flow arrow printed on the sensor housing is counted as forward energy.
Installation Video
🚧Coming soon...
6. User Interface
Reset Button
Press and hold for above 5 seconds to enter pairing mode.
LED Indicator
Solid ON
Device connected - the device is online and functioning normally with cloud connectivity.
Flashing at 2Hz
Pairing mode – press and hold the reset button until the LED flashes rapidly.
Flashing at 0.5Hz
Reconnecting to network - the device is attempting to reconnect using saved network settings.
Flashing at 1Hz
Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.
Flashing at 0.25Hz
The device failed internal self-check. Please power off, restart, and reconfigure the network settings.
Solid ON
Device connected - the device is online and functioning normally with cloud connectivity.
Flashing at 2Hz
Pairing mode – press and hold the reset button until the LED flashes rapidly.
Flashing at 0.5Hz
Reconnecting to network - the device is attempting to reconnect using saved network settings.
Flashing at 1Hz
Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.
Flashing at 0.25Hz
The device failed internal self-check. Please power off, restart, and reconfigure the network settings.
Solid ON
Zigbee connected, BLE disconnected – the device is connected to a Zigbee network while BLE is turned off or not connected.
Flashing at 2Hz
Pairing mode – press and hold the reset button until the LED flashes rapidly.
Flashing at 0.5Hz
Reconnecting to network - the device is attempting to reconnect both BLE (if available) and Zigbee using saved settings.
Flashing at 1Hz
BLE connected(if available) - the LED flashes at 1Hz whenever BLE is connected, regardless of Zigbee status.
Flashing at 0.25Hz
The device failed internal self-check. Please power off, restart, and reconfigure the network settings.
Solid ON
Wi-Fi connected, BLE disconnected - the device is connected to Wi-Fi while BLE is disconnected.
Flashing at 2Hz
Pairing mode – press and hold the reset button until the LED flashes rapidly.
Flashing at 0.5Hz
Reconnecting to network - the device is attempting to reconnect both BLE and Wi-Fi using saved settings.
Flashing at 1Hz
BLE connected - the LED flashes at 1Hz whenever BLE is connected, regardless of Wi-Fi status.
Flashing at 0.25Hz
The device failed internal self-check. Please power off, restart, and reconfigure the network settings.
7. System Integration
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.
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:
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.
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.
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:
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.
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.
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:
SmartThings: Integration via the SmartThings Hub driver (officially approved).
Homey: Integration via the Bituo Technik App
You can find information about the commonly used Zigbee Cluster Library on this page.
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.
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.
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.
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.
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.
8. Ordering Information
1
SPM01-D1TW
SPM01 MCBM-DI 63A/1PN Tuya Wi-Fi
2
SPM01-U1TW
SPM01 MCBM-UI 63A/1PN Tuya Wi-Fi
1
SPM01-D1TZ
SPM01 MCBM-DI 63A/1PN Tuya Zigbee
2
SPM01-U1TZ
SPM01 MCBM-UI 63A/1PN Tuya Zigbee
1
SPM01-D1TZ-U01
SPM01 MCBM-DI 63A/1PN Std. Zigbee (EFR32MG21)
2
SPM01-U1TZ-U01
SPM01 MCBM-UI 63A/1PN Std. Zigbee (EFR32MG21)
1
SPM01-D1EW
SPM01 MCBM-DI 63A/1PN Open Wi-Fi (ESP32-8685)
2
SPM01-U1EW
SPM01 MCBM-UI 63A/1PN Open Wi-Fi (ESP32-8685)
9. FAQ
FAQ10. Troubleshooting
Troubleshooting11. Printed Document
12. Explore More
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