b>4-Channel Relay Module, 24 V,, 4-Channel Relay Module The relay module has 4 channels and is designed for an operating voltage of 24 V. Connections for the relay power supply, module power supply, ground, and relay control are provided. https://elecena.pl/product/29666263/developer-boards-relay-module-4-channels-5-v 2026-01-04 https://elecena.pl/product/29666263/developer-boards-relay-module-4-channels-5-v 2026-02-14