DC 5V Netzteil 4 Kanal NO NC Optokoppler Isoliert Relais Modul|relay design|modulations moviemodule board - AliExpress
Art Controller Relay Board Kit : ID 1038 : $17.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Controllable Four Outlet Power Relay Module version 2 [(Power Switch Tail Alternative)] : ID 2935 : $39.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Keyestudio 2CH 5V Relay Module Compatible with Arduino ARM PIC AVR DS