This is a Murphy 12V Tattletale®. Used in gas or diesel models with instant-trip (no delay).
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 this 518PH1-2. Contacts 10 amps 12V. 14 amp fuse.
Give us a call if you have any questions at 602-850-7399.