SOLID STATE RELAYS (SSR)

Watlow solid state relays (SSR) offer many of the advantages of solid state power controllers, but at a lower cost. SSRs contain a special fast cycle input card which enables it to work from a standard 4-20mA command signal. The zero-cross SSR combined with the fast cycle input card promote a longer heater life as well as improved temperature control. Available from 24 to 660VAC, these AC output models not only include back-to-back silicon controlled rectifiers (SCRs), but the internal design allows the SSR to tolerate high currents and severe electrical environments. The device also offers Belleville washers which ensure the relay is able to be mounted with sufficient pressure that also enables good heat transfer.