40-120A single phase solid state relay

SSRs have no mechanical parts, reducing the risk of arcing, making them more durable and reliable in high-frequency switching applications. Solid state relays can significantly decrease both downtime and maintenance costs.

A margin should be left when selecting the voltage and current of the solid state relay. For resistive load: the current is selected according to 2.5~4 times the load current, and the voltage is selected according to 2~2.5 times the load power. Inductive load: current is selected according to 3-7 times load current, voltage is selected according to 2.5-3 times load voltage.

The main differences between a Silicon Controlled Rectifier (SCR) module and a Solid State Relay (SSR) lie in their functions and composition. An SCR can regulate current by controlling the conduction angle, while an SSR primarily acts as a switch and cannot regulate current. A Solid State Relay consists of an SCR and a synchronous trigger drive, with an integrated isolation trigger terminal, whereas an SCR requires external isolation. Although they may have similar functions in some applications, they differ significantly in regulation capability and internal structure.