Dual Protection – Optocoupler + Fuse Safety. Unlike basic relay modules, ours features optocoupler isolation + fuse protection to block voltage spikes and prevent MCU damage (Arduino/RPi safe).
Fault-Tolerant & Safe Design – Even if the control line is disconnected, the relay remains inactive; All interfaces (NO, NC, COM) are accessible via screw terminals for easy wiring and secure connections.
Flexible Trigger Mode – Equipped with a jumper to select High or Low level trigger, making it compatible with various control systems (ARM, PIC, AVR, CNC, etc.).
Wide Compatibility & 5pcs Value Pack – Ideal for DIY electronics, home automation, and industrial control; Works seamlessly with Arduino, Raspberry Pi, PS4, and more. Includes 5 relay modules (red PCB) for extended projects.