SONOFF SPM-MAIN Smart Power Monitoring Hub DIN Rail Central Unit Works with SPM-4RELAY
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The SONOFF SPM-Main is the central hub of the SONOFF Smart Power Management system, connecting up to 32 SPM-4Relay modules for centralized control of up to 128 circuits. With RS-485 communication, Ethernet & Wi-Fi connectivity, real-time energy monitoring, local microSD storage, and overload protection, it allows professional energy management for homes, offices, factories, and data centers. Controlled via eWeLink app or web dashboard, the SPM-Main ensures reliable, scalable, and intelligent smart power automation.
وحدة التحكم المركزية SONOFF SPM-Main هي قلب نظام إدارة الطاقة الذكي من SONOFF، وتدعم توصيل ما يصل إلى 32 وحدة SPM-4Relay للتحكم المركزي في 128 دائرة كهربائية. تتميز بالاتصال عبر RS-485، الشبكة السلكية واللاسلكية، مراقبة الطاقة في الوقت الحقيقي، تخزين البيانات محليًا على بطاقة microSD، وحماية من التحميل الزائد. يمكن التحكم بها عبر تطبيق eWeLink أو لوحة الويب لإدارة ذكية وموثوقة للطاقة في المنازل والمكاتب والمصانع.
The SONOFF SPM-Main Smart Power Monitoring Hub is the central unit and communication gateway of the SONOFF Smart Power Management ecosystem. It enables centralized control, energy monitoring, and automation for large-scale electrical installations by connecting up to 32 SPM-4Relay modules, providing management of up to 128 relay channels.
Designed for commercial, industrial, and residential projects, the SPM-Main collects real-time voltage, current, power, and energy consumption data from each relay channel. It supports local data storage on a microSD card (up to 256GB), ensuring historical energy data is always available, even if offline. Through the eWeLink app or web dashboard, users can remotely control circuits, automate schedules and scenes, view reports, and receive instant alerts for overload or short-circuit events.
Equipped with RS-485, Ethernet, and Wi-Fi 2.4GHz connectivity, the hub ensures stable communication with relay modules and secure cloud access. Its DIN rail industrial design allows neat installation inside control cabinets or distribution boxes. Built with flame-retardant PC V0, the SPM-Main delivers professional-grade reliability, scalability, and intelligent energy management, making it ideal for offices, factories, apartment complexes, server rooms, and other large-scale smart power systems.
Technical Specifications
| Specification | Details |
|---|---|
| Model | SONOFF SPM-Main |
| Communication | RS-485 to SPM-4Relay (Max 32 Modules / 128 Channels) |
| Network | Wi-Fi IEEE 802.11 b/g/n (2.4 GHz), RJ45 Ethernet |
| Power Supply | 100–240V AC, 50/60 Hz |
| Data Storage | microSD Card (Max 256GB) |
| Compatible Module | SONOFF SPM-4Relay |
| App Support | eWeLink (iOS / Android) |
| Protection Features | Overload, Short-Circuit Alerts |
| Installation | DIN Rail Mount |
| Operating Temperature | -10°C to +40°C |
| Material | Flame-retardant PC V0 |
| Dimensions | 143 × 90 × 66 mm |
Applications
Centralized energy management for smart homes and buildings
Industrial power monitoring for factories, workshops, and server rooms
Remote control of SPM-4Relay modules via app or web dashboard
Automation of multiple circuits with schedules, scenes, and alerts
Historical data tracking and energy usage analysis
Integration for office complexes, apartment buildings, and commercial spaces
Reliable overload and short-circuit protection for high-power installations
Why Choose SONOFF SPM-Main?
Central hub for professional energy management systems
Controls up to 128 relay channels when paired with SPM-4Relay
Ethernet + Wi-Fi connectivity for stable remote access
Energy monitoring, automation, and SD card data backup
Ideal for smart buildings, apartments, offices, factories, vending machines, and commercial setups