Relays

Relays are electrically-operated switches that use an electromagnet or solid-state mechanism to control high-power circuits with low-power signals — providing galvanic isolation between control and load. This category includes electromechanical relays (general purpose, signal, power), solid-state relays (SSR), reed relays, automotive relays, safety relays, and time delay relays. Key parameters: coil voltage (5V, 12V, 24V DC), contact configuration (SPST, SPDT, DPDT), contact rating (max switching voltage/current), contact material (Ag, AgNi, Au-plated), operate/release time, mechanical/electrical life, and coil power consumption. SSRs offer silent operation and longer lifetime vs electromechanical types. Popular manufacturers: Omron, Panasonic, TE Connectivity, Finder, Schneider Electric, Phoenix Contact, and Siemens.