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SPM02 MCBM

Applies to: SPM02 MCBM | Hardware Revision: V3.0+ | Last Updated: 2026-05-20

1. Introduction

The SPM02 Miniature Energy Meter (MCB-mounting Version) is an advanced electrical monitoring device designed for three-phase applications, specifically designed for seamless integration with miniature circuit breakers (MCB).

Product Highlights

  • Ultra-Compact Installation: Optimize your panel layout. It mounts directly alongside circuit breakers without consuming valuable DIN-rail space, ideal for high-density distribution boards.

  • Real-Time Power Tracking: Gain instant visibility into your electrical network. It captures voltage, current, and power factor metrics instantly to help drive energy efficiency strategies.

  • Built for Heavy Loads: Features a wide 9.6mm aperture that easily accepts up to 16mm² wiring, safely and reliably supporting measurements up to 63A.

  • Uncompromising Precision: Delivers accurate active energy measurements with a tolerance of 1%, ensuring precise monitoring of energy consumption.

  • Standard Zigbee 3.0 Integration: Powered by standard Zigbee 3.0. It ensures seamless, cloud-independent connectivity with major smart hubs and gateways for rapid deployment.

Typical Applications

  • Energy management systems (EMS) for home and small business

  • Energy management systems (EMS) for buildings, Infrastructure, and Industry

  • Energy monitoring for HVAC system

  • Energy monitoring for commercial lighting system

2. Part Description

#
Element
Description

1

Terminal plate for X connection

Insert to protective device terminal box for power supply from phase1)

2

Terminal plate for Y connection

Insert to protective device terminal box for power supply from phase1)

3

Terminal plate for Z connection

Insert to protective device terminal box for power supply from phase1)

4

Cable for N connection

Connect to power supply from Neutral (N)

5

Through-hole for X wire

Through-hole for X wire: Ensure the wire (X) passes through the hole.

6

Through-hole for Y wire

Through-hole for Y wire: Ensure the wire (Y) passes through the hole.

7

Through-hole for Z wire

Through-hole for Z wire: Ensure the wire (Z) passes through the hole.

8

Reset button

Press the button above 5 seconds to enter the pairing mode

9

LED indicator

Shows device operation and network status through different flashing patterns.2)

10

Power flow direction

Indicates forward / positive power flow for installation

11

Product model

Refer to the 'Ordering Information' section for product selection.

Remark:

1) The manufacturer has only verified the compatibility of SPM02 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

Parameter
Specification

Rated operating voltage Un

220-240 VAC (L-N), 50/60 Hz 380-415 VAC (L-L), 50/60 Hz

Max monitoring current Imax

63 A

Over-voltage category

III

Rated insolating voltage Ui

440V

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 70°C

Size: Height x Width x Depth

46.4x53.0x21.3mm

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 SPM02 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

Cover

Solid ON

Device connected - the device is online and functioning normally with cloud connectivity.

Cover

Flashing at 2Hz

Pairing mode – press and hold the reset button until the LED flashes rapidly.

Cover

Flashing at 0.5Hz

Reconnecting to network - the device is attempting to reconnect using saved network settings.

Cover

Flashing at 1Hz

Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.

Cover

Flashing at 0.25Hz

The device failed internal self-check. Please power off, restart, and reconfigure the network settings.

Cover

Flashing at 1Hz

Alarm reminder - The device has detected a fault. Please check the wiring and power supply.

Cover

Solid ON

Device connected - the device is online and functioning normally with cloud connectivity.

Cover

Flashing at 2Hz

Pairing mode – press and hold the reset button until the LED flashes rapidly.

Cover

Flashing at 0.5Hz

Reconnecting to network - the device is attempting to reconnect using saved network settings.

Cover

Flashing at 1Hz

Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.

Cover

Flashing at 0.25Hz

The device failed internal self-check. Please power off, restart, and reconfigure the network settings.

Cover

Flashing at 1Hz

Alarm reminder - The device has detected a fault. Please check the wiring and power supply.

Cover

Solid ON

Zigbee connected, BLE disconnected – the device is connected to a Zigbee network while BLE is turned off or not connected.

Cover

Flashing at 2Hz

Pairing mode – press and hold the reset button until the LED flashes rapidly.

Cover

Flashing at 0.5Hz

Reconnecting to network - the device is attempting to reconnect both BLE (if available) and Zigbee using saved settings.

Cover

Flashing at 1Hz

BLE connected(if available) - the LED flashes at 1Hz whenever BLE is connected, regardless of Zigbee status.

Cover

Flashing at 0.25Hz

The device failed internal self-check. Please power off, restart, and reconfigure the network settings.

Cover

Flashing at 1Hz

The device has detected a fault. Please check the wiring and power supply.

Cover

Solid ON

Wi-Fi connected, BLE disconnected - the device is connected to Wi-Fi while BLE is disconnected.

Cover

Flashing at 2Hz

Pairing mode – press and hold the reset button until the LED flashes rapidly.

Cover

Flashing at 0.5Hz

Reconnecting to network - the device is attempting to reconnect both BLE and Wi-Fi using saved settings.

Cover

Flashing at 1Hz

BLE connected - the LED flashes at 1Hz whenever BLE is connected, regardless of Wi-Fi status.

Cover

Flashing at 0.25Hz

The device failed internal self-check. Please power off, restart, and reconfigure the network settings.

Cover

Flashing at 1Hz

Alarm reminder - The device has detected a fault. Please check the wiring and power supply.

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:

  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.

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:

  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.

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, SPM02, SDM01, and SDM02)

  • 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.

  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.

8. Ordering Information

#
Ordering number
Description

1

SPM02-D1TW

SPM02 MCBM-DI 63A/3PN Tuya Wi-Fi

2

SPM02-U1TW

SPM02 MCBM-UI 63A/3PN Tuya Wi-Fi

#
Ordering number
Description

1

SPM02-D1TZ

SPM02 MCBM-DI 63A/3PN Tuya Zigbee

2

SPM02-U1TZ

SPM02 MCBM-UI 63A/3PN Tuya Zigbee

#
Ordering number
Description

1

SPM02-D1TZ-U01

SPM02 MCBM-DI 63A/3PN Std. Zigbee (EFR32MG21)

2

SPM02-U1TZ-U01

SPM02 MCBM-UI 63A/3PN Std. Zigbee (EFR32MG21)

#
Ordering number
Description

1

SPM02-D1EW

SPM02 MCBM-DI 63A/3PN Open Wi-Fi (ESP32-8685)

2

SPM02-U1EW

SPM02 MCBM-UI 63A/3PN Open Wi-Fi (ESP32-8685)

9. FAQ

FAQ

10. Troubleshooting

Troubleshooting

11. Printed User Guide

Document
Download

Datasheet

⬇️ PDF

User Guide

⬇️ PDF

12. Explore More

PreviousSPM01 MCBM
NextSPM01R FLEX

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