Catalog > Internet of Things (IOT) Related Products > Itead Studio SPM 4-Relay Unit SPM 4-Relay SONOFF SPM-4 RELAY A DIN-RAIL COMPATIBLE, STACKABLE RELAY WITH UP TO 20A PER CHANNEL MAX. CAPACITY. ONE SONOFF SPM-MAIN POWER METER CAN BE CONNECTED TO 32 SPM-4RELAYS. THE SPM-MAIN COMMUNICATES WITH THE SPM-4RELAYS THROUGH RS-485. SPM MAIN UNIT IS SOLD SEPARATELY. 1,239.13 ZAR inc for 1 Each 9 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Connect up to 32 SPM-4Relays : One SPM-Main can be connected 32 SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help you manage devices more conveniently. Power metering : You can monitor the power consumption by checking eWeLink App on your mobile phone. Obtaining current, voltage and power easily. Max. 20A/Gang : Each channel can support maximum current of 20A, no fear of high power load. Communicated by RS-485 : The SPM-Main communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission. Overload Protection : Once the overload protection is enabled, it can protect your devices from burning out. Specifications Model : SPM-4Relay Color : White Shell material : PC V0 Input : 100-240V ~ 50/60Hz 20A/Gang 80A/Total Max Output : 100-240V ~ 50/60Hz 20A/Gang 80A/Total Max Dimension : 250x90x66.5mm Downloads Specification - SPM-4Relay PDF File 586.28 KB User Manual - SPM-4Relay PDF File 1.28 MB Quick Start - SPM-4Relay PDF File 4.37 MB