The KAQY214STLD SOP-4 RoHS with Solid State Relays manufactured by Cosmo is a 4-pin single-in-line package (SIP) solid state relay. It provides protection from inrush current, has a low-turn on voltage, and contains zero contact bouncing and arcing. This relay is designed for use in low-level switching applications, and requires a low input power to switch the relays on and off. The operating temperature range of this relay is from -40°C to +100°C, and it meets RoHS requirements for hazardous materials. The built-in flyback diode of the relay is a major component of its protection from inrush current.