Zelio™ SSL, SSM and SSP relays do not have any moving parts to wear out. Combined with vibration resistance, arc-less switching and the lack of acoustical noise, solid state relays are the ideal product for switching applications that demand reliable execution. For added reliability, the Zelio™ SSL, SSM and SSP solid state relays use Direct Copper Bonding (DCB) technology to decrease internal temperatures and improve the overall quality of the product.