Power Relay Module X 2 - Relay 5V or 12V High Low Level Octocoupler - Free P&P

1/2/4/8 Arduino Pi Channel Relay Board Module Selectable High Low 5V 12V 24V

Power Relay Module X 4 - Relay 5V or 12V High Low Level Octocoupler - Free P&P

5V 12V 24V Dual Double Self-Locking Interlock Latching Relay Module High / Low

5V/12V/24V Relay Module with Optocoupler 1/2/4/6/8/16 Channel for Arduino Pi UK

5V 12V 24V Single Self Locking Latching Bistable Interlock Relay Module Switch

1 channel 12V Relay Module, Opto-coupler isolated, for Arduino and MCU projects.

Relay Module Interface Boards for Arduino Low Level Trigger 1/2/4/6/8 Channels