What Is the Difference Between a Relay and a Solid-State Relay?
A relay and a solid-state relay (SSR) both perform the same switching function but operate differently. A relay uses electromagnetic contacts to open or close circuits, while a solid-state relay uses semiconductor devices to control current flow without physical movement. Because of this, Autonics SSR models provide faster switching, longer lifespan, and silent operation compared to traditional mechanical relays.
Mechanical relays are more affordable and suitable for general applications, but their contacts wear out over time due to arcing. In contrast, solid-state relays have no moving parts, offering stable performance even in high-frequency or harsh environments. They are ideal where consistent switching and durability are required.
In short, mechanical relays are best for simple control circuits, while Autonics SSR units are preferred in industrial automation, temperature control, and motion systems, thanks to their reliability, precision, and maintenance-free design.