Description
The SONOFF SPM-4RELAY is a professional-grade 4-channel DIN rail-mounted smart relay designed for precise high-power control and energy monitoring. Ideal for smart homes, commercial spaces, server rooms, vending machines, and industrial energy management projects, it allows simultaneous management of up to four devices independently. When paired with the SPM-Main unit, the SPM-4RELAY provides remote control, real-time power usage monitoring, overload protection, and cloud-based data storage via the eWeLink platform. The relay supports automated schedules, scene integration, and instant alerts, enabling intelligent energy management and operational efficiency. Built with durable materials and compact DIN-rail design, the SPM-4RELAY ensures reliable performance, safe operation, and seamless integration into professional and residential electrical setups.
Key Features
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4 Independent Smart Relay Channels
Control and monitor up to four electrical circuits individually.
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Energy Monitoring (When Used with SPM-Main)
Real-time tracking of voltage, current, power consumption, and historical energy data.
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DIN Rail Mounting Design
Easy installation into power distribution boxes or control panels.
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High Power & Safety Protection
Supports up to 20A per channel (MAX 40A total) with overload and short-circuit protection.
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Remote Control via eWeLink App
Turn circuits ON/OFF anytime, anywhere using your smartphone.
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Cloud & Local Storage
Energy data is stored securely on the cloud or locally via microSD card (up to 256GB) on the SPM-Main.
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Works with Schedules & Automation Scenes
Supports timers, scenes, and smart schedules across multiple relay channels.
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Industrial & Commercial Grade Reliability
Perfect for offices, workshops, apartment complexes, rental properties, vending machines, and server rooms.
Technical Specifications
| Specification |
Details |
| Model |
SONOFF SPM-4RELAY |
| Channels |
4 × Independent Relays |
| Input / Output Voltage |
100–240V AC |
| Max Load per Channel |
20A |
| Total Max Load |
40A |
| Wireless Communication |
RS-485 (Connects to SPM-Main) |
| Energy Monitoring |
Yes (Requires SPM-Main Module) |
| Data Storage |
Cloud or microSD up to 256GB (via SPM-Main) |
| Installation Type |
DIN Rail Mount |
| Working Temperature |
-10°C to +40°C |
| Material |
Flame-Retardant PC V0 |
| Dimensions |
143 × 90 × 66 mm |
| App Support |
eWeLink (iOS & Android) |
| Certifications |
CE / FCC / RoHS |
Why Choose SONOFF SPM-4RELAY?
Smart 4-channel control for homes and commercial environments
Real-time energy monitoring and advanced protection
Works with timers, automation scenes, and cloud storage
Ideal for offices, smart buildings, vending machines, server rooms & factories
Modular and scalable – can connect multiple relay modules using SPM-Main
