4-Terminal Relay Wiring Diagram - Color-Coded Connections Explained #2043144 (License: Personal Use)

This illustration shows a four-screw terminal block connected to a relay coil and contacts, with red (live), yellow (control signal), black (neutral/ground), and green (earth) wires routed to appropriate terminals. The layout emphasizes safe, standardized wiring practices used in low-voltage control circuits. Each screw terminal is clearly marked with a plus symbol, indicating polarity-sensitive connections.

Used on electronics tutorial pages, DIY automation guides, or product documentation for relay modules; targets hobbyists and technicians seeking visual wiring guidance for home automation or industrial control systems.