SONOFF SPM-4Relay Smart Stackable Power Meter – 4-Channel Relay Module for Smart Power Monitoring, Load Control & Energy Management.
Overview:
• The SONOFF SPM-4Relay Smart Stackable Power Meter is a 4-channel relay and power monitoring module designed to work as part of the SONOFF Smart Stackable Power Meter system.
• Each SPM-4Relay provides 4 isolated relay channels, allowing users to control and monitor multiple independent electrical circuits from one DIN rail module.
• The module communicates with SONOFF SPM-Main through RS-485, while the SPM-Main handles network connection, app management, and data storage.
• One SPM-Main can connect up to 32 × SPM-4Relay units, allowing a scalable system of up to 128 isolated electrical channels.
• Each channel supports up to 20A Max, with the full module supporting up to 80A Total Max, making it suitable for professional electrical panel monitoring and multi-circuit load management.
Key Features:
• 4-Channel Relay Module for controlling 4 independent electrical circuits.
• Power Monitoring for each connected relay channel.
• 20A Max per Gang for high-load circuit management.
• 80A Total Max for the full 4-channel module.
• RS-485 Communication with SONOFF SPM-Main.
• Remote Control & Monitoring through eWeLink App when connected to SPM-Main.
• Voltage, Current, Power & Energy Monitoring through the SPM system.
• Overload Protection for safer circuit operation.
• Physical ON/OFF Buttons on the relay module for local manual control.
• DIN Rail Installation suitable for electrical panels and distribution boards.
• Expandable System Design with up to 32 SPM-4Relay modules per SPM-Main.
• Important Note: SPM-4Relay requires SONOFF SPM-Main for app control, data reading, and full system operation.
Technical Specifications:
• Model Name: SONOFF SPM 4 Relay Smart Stackable Power Meter / SPM-4Relay.
• Brand: SONOFF.
• Product Type: 4-Channel Smart Relay Power Meter Module.
• System: SONOFF Smart Stackable Power Meter System.
• Compatible Main Unit: SONOFF SPM-Main.
• Channels: 4 Isolated Relay Channels.
• Communication: RS-485.
• Input Rating: 100–240V AC, 50/60Hz, 20A/Gang, 80A Total Max.
• Output Rating: 100–240V AC, 50/60Hz, 20A/Gang, 80A Total Max.
• Power Monitoring: Current / Voltage / Power / Energy Consumption.
• Maximum Current per Channel: 20A Max.
• Total Current Capacity: 80A Total Max.
• Control Method: Through SPM-Main / eWeLink App.
• Manual Control: Physical ON/OFF Buttons.
• Protection: Overload Protection.
• Material: PC V0 Flame-Retardant Material.
• Dimensions: 250 × 90 × 66.5 mm.
• Working Temperature: -10°C to 40°C.
• Installation Type: DIN Rail / Electrical Panel Installation.
• Application: Indoor Electrical Monitoring & Control.
Applications:
• Electrical distribution board monitoring.
• Multi-channel power consumption management.
• Commercial building energy monitoring.
• Shared electricity consumption tracking.
• Apartments and tenant electricity management.
• Offices and retail shops.
• Server rooms and equipment rooms.
• Smart electrical panel projects.
• Energy-saving and consumption analysis systems.
• Large-scale eWeLink power monitoring projects.
Connect Gates Recommendation:
• Recommended by Connect Gates for professional electrical panel projects that require 4 independent relay channels, 20A per-channel load management, accurate power monitoring, and scalable integration with SONOFF SPM-Main for multi-circuit energy management.