The YSK-SS-105L with Relays Through Hole RoHS is a type of relay manufactured by YUANZE Relay, which is a PCB mountable, single coil miniature power relay. It offers a high sensitivity of 2.1W, long contact life up to 5,000,000 cycles, and a high dielectric strength of 2,500VAC between contacts and coil. The relay is designed to be soldered directly onto a PCB or to a DIP-style connector, and it is RoHS compliant. It is typically used in applications that require high contact reliability, such as industrial automation circuits, low power switching applications, security devices, and other DC circuit controls.