Solid state relays (SSRs) are advanced contactless switches that utilize a combination of microelectronic circuits, discrete electronic devices, and power electronic components. These relays efficiently use small control signals to drive large current loads, offering enhanced performance and reliability.

SSRs feature built-in short circuit protection, overload protection, and overheat protection, making them ideal for integration into control systems. They are widely used in applications such as computer peripheral interfaces, temperature control systems, electric furnace heating, motor control, numerical control machinery, industrial automation devices, and remote control systems.