Description
The SONOFF SPM-4Relay is the 4-channel relay unit of the SONOFF Smart Stackable Power Meter (SPM) system. It gives you 4 isolated channels of up to 20A each (80A total) in a DIN rail housing, so you can switch and monitor separate circuits or high-power devices.
Connected to the SPM-Main unit, it shows real-time current, voltage and power for each channel in the eWeLink app and cuts power automatically on overload. One SPM-Main connects up to 32 SPM-4Relay units, and the Main unit's microSD card stores over 20 years of power data and up to 20,000 operation logs per device.
Note: the SPM-4Relay works together with the SPM-Main unit. The Main unit must be connected to at least one SPM-4Relay to function.
Key Features
- 4 isolated relay channels, 20A per channel and 80A total maximum
- Real-time current, voltage and power monitoring per channel in the eWeLink app
- Overload protection that cuts power automatically to protect your devices
- Stackable system: up to 32 SPM-4Relay units on one SPM-Main (up to 128 channels)
- Power data and operation logs stored on the SPM-Main microSD card (8–32GB SDHC), with quick export of consumption reports
- RS-485 connection to the SPM-Main unit
- Remote on/off control, timers, schedules and scenes in the eWeLink app
- DIN rail mounting in distribution boards and control panels
Works With
-
Required main unit: SONOFF SPM-Main (one SPM-Main controls up to 32 SPM-4Relay units)
Technical Specifications
| Specification |
Details |
| Model |
SPM-4Relay |
| System |
SONOFF Smart Stackable Power Meter (SPM) |
| Channels |
4 isolated channels |
| Input |
100-240V~ 50/60Hz 20A/Gang 80A/Total Max |
| Output |
100-240V~ 50/60Hz 20A/Gang 80A/Total Max |
| Connection to Main Unit |
RS-485 (SPM-Main required) |
| Wi-Fi (via SPM-Main) |
802.11 b/g/n 2.4GHz |
| Data Storage (via SPM-Main) |
microSD card, 8GB–32GB SDHC |
| Installation |
DIN rail |
| App |
eWeLink |
| Color |
White |
| Shell Material |
PC V0 |
| Working Temperature |
-10°C ~ 40°C |
| Dimensions |
143 × 90 × 66 mm |
| Certifications |
CE, FCC, RoHS |
Why Choose the SONOFF SPM-4Relay?
- Per-circuit control and monitoring of high-power loads up to 20A per channel
- Scales from 4 to 128 channels as your installation grows
- Built-in overload protection for safer operation
- Long-term local data storage for energy reports
Downloads
⬇ Download User Manual (PDF)
Warranty: 12-month warranty from the Official Distributor.
