KEY-IOT (StarElink) SR520 2-LAN Dual SIM 4G Industrial Router

The SR520 is a dual-card redundant 4G industrial router with 2 Gigabit LAN ports. Equipped with dual SIM card automatic switching backup function, it effectively avoids network disconnection and offline problems. It integrates RS485, RS232 and DI/DO IO interfaces, supports full VPN encryption and industrial MQTT protocol. Compact industrial design with DIN rail installation, ideal for unattended equipment, smart vending machines and remote monitoring scenarios requiring high network stability.