The Murphy Tattletale Magnetic Switch 12 Volts 518APH-12 is the nerve center that translates Swichgage contact operations into decisions and operate the alarm or shutdown device. It allows for Swichgage and/or N.C. contacts to be wired "Closed Loop" (in series). Any contact open or Swichgage contact close in the circuit shunt trips the 518APH-12. Contacts are rated for 10 amps 12V. A 14 amp fuse is included. This model features a weather resistant case with screw terminals for ease of customer hookup, NCH and NOH control circuit output contact and manual reset. For distributor ignition or diesel engines.
Tattletale Annunciator indicates which monitored function failed leading to the alarm or shutdown whereas magnetic switches do not. Magnetic switches operate basically as a latching relay.