LCUS 4 USB Relay module

Reliable 4‑Channel USB‑Controlled Relay Module

The LCUS 4 USB Relay Module is a compact, high‑reliability solution for remotely controlling AC and DC loads from a PC, Raspberry Pi or Arduino via a standard USB interface. Each of the four relays is driven by a 5 V coil and offers 300 A / 250 V AC or 10 A / 30 V DC switching capability, making the board suitable for appliances, lighting, HVAC systems and industrial equipment. The relays are isolated from the USB host by opto‑couplers and an internal 5 V regulator provides clean power to the coil circuits while the logic side remains fully protected.

With the included USB–to–serial firmware driver, the module operates through simple serial commands – e.g., ON0 to energize relay 0 or OFF2 for relay 2 – allowing it to be integrated into automation scripts, network services or custom control panels. Durably plated contacts, 30 000 switching cycles per relay and robust PCB construction ensure long‑term operation in demanding environments.

• Key Spec 1: 4 independent solid‑state relays, 1 A / 5 V coil drive
• Key Spec 2: AC load: up to 300 A at 250 V; DC load: up to 10 A at 30 V
• Key Spec 3: USB 2.0 interface with 24‑bit FTDI/CP2102 driver support
• Common Use Case: Home automation – remote switching of lights, fans, or power outlets via PC or embedded systems