8 Channel Relay Module (USB-RLY16L, Low Power Version, Up to 16Amp)

USB‑RLY16L low‑power USB relay controller provides reliable switching for high‑current electrical loads while drawing power directly from the USB interface. This compact relay control board integrates eight independent volt‑free relay outputs capable of handling up to 16A per channel, enabling safe isolation between control electronics and external circuits. Designed for embedded automation, industrial experimentation, and PC‑based control systems, this USB relay switching module eliminates the need for an external power supply while maintaining robust switching capability suitable for demanding electrical applications.

USB‑Powered Low‑Energy Relay Operation

This USB relay interface operates entirely from the USB bus, removing the requirement for auxiliary power wiring. The low‑power architecture simplifies system integration for desktop automation systems, embedded controllers, and experimental control setups. Direct USB power delivery also reduces installation complexity and improves deployment flexibility when integrating relay switching into computer‑controlled environments, test benches, or equipment automation platforms where convenient USB connectivity is available.

High‑Current SPCO Relay Switching

Eight Single Pole Change Over (SPCO) relays provide flexible switching configurations with position 0, position 1, and common terminals available through labeled screw connectors (0, C, and 1). Each relay channel supports switching currents up to 16A and voltages up to 277VAC, enabling control of motors, lighting systems, power circuits, and other high‑load equipment. Latching relay architecture ensures relay states remain preserved even when power is removed, supporting stable automation workflows.

Clear LED Status Indication

Integrated red status LEDs positioned beside each relay channel provide immediate visual confirmation of switching state. An illuminated LED indicates position 1, while an unlit LED represents position 0. This visual feedback simplifies debugging, monitoring, and system verification during installation or operation. Engineers and system integrators benefit from rapid status recognition when managing multiple relay channels in automation panels or computer‑controlled electrical systems.

Such USB relay switching hardware enables straightforward integration into PC‑controlled automation, equipment testing rigs, laboratory instrumentation, and remote switching solutions. Eight independent high‑current channels combined with USB bus power make this relay interface board well suited for electrical load control, automation prototyping, and embedded system experiments requiring reliable isolation and switching flexibility.