Smart Switch Module

SONOFF SPM-4Relay Smart Stackable Power Meter  The SONOFF smart stackable metering system realizes smart management with overload protection, metadata monitoring and electricity statistics. It supports up to 128 channels (up to 32 SPM-4Relay modules), a maximum current of 20A per channel, allows monitoring of 180 days of electricity consumption data, and management of each channel individually. The SPM-Main control panel allows 8Gb-32Gb SD memory card for secure local data storage. It is a high-performance professional smart home tool for managing homes, office buildings, industrial buildings or even shopping centres, enabling energy consumption monitoring for residents or tenants. Note: module requires SPM-Main control panel , which is sold separately.  Features:  The SPM-Main communicates with the cloud through Ethernet or WiFi using EWeLink app (Android, iOS), and communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission. One SPM-Main connects up to 32 relay modules and supports up to 128 channels of 20A for control and metering. The SPM-Main control panel allows the use of 8Gb-32Gb SD memory cards for secure storage of consumption data. SD cards are purchased separately. Remote on/off - you can switch all channels on and off remotely anytime, anywhere. Synchronisation status - check the actual status of the relay (on or off) using the app. Power consumption data for home equipment can be downloaded for accounting. LAN mode is supported. DIN rail mounted, like relay modules, to fit the electrical cabinet. Housing material made of flame-retardant V0 PC plastic. Protection for all channels against overload, overvoltage, overcurrent.  Specifications:  Compatible with: Sonoff SPM-4Relay. Voltage: 100V~240V AC. Frequency: 50/60Hz. Current: max. 50mA. Wi-Fi Frequency: 2.4 GHz. Wi-Fi standard: IEEE802.11b/g/n. Number of channels: 4. Works with Amazon Alexa & Google Assistant. App: eWeLink (Android, IOS). MCU: ESP32 GD32F. Dimensions: 142.5x90x66.5 mm. Housing material: PC V0 (flame-retardant). Mounting: on DIN rail. Connection: RS485. Operating temperature: -10°C~+40°C. Operating humidity: 5%-95% (non-condensing). Weight: 214g. Colour: white. Certification: CE/UKCA/FCC/ROHS.  Warranty: 24 months.