It is Durable because CURAMIK DBC substrate and high quality SCR, Strict production process,have 25 years experience workers we are the first production of SSR factory,have 25 years history.Durable is the customer's evaluation of our productOur Solid State Relay is Durable for CURAMIK DBC substrate, high quality SCR, Strict production process,have 25 years experience workersCE certificate