518APH Tattletale® Annunciators and Magnetic Switch

Allows for Swichgage and/or N.C. contacts to be wired "Closed Loop". Any contact open or Swichgage contact close in the circuit shunt trips the 518APH. 12 volt. The nerve centers that translate Swichgage contact operations into decisions and operate the alarm or shutdown device. They are the electrical load carrying devices for the alarm or shutdown device. Tattletale annunciators indicate which monitored function failed leading to the alarm or shutdown whereas magnetic switches do not. Magnetic switches operate basically as a latching relay.