The Murphy Magnetic Switch 12V Negative Ground 760A-30-12N is used for distributor ignition or diesel. Time delay lockout of SWICHGAGE contacts on startup only; customer wired for delayed or immediate trip on shutdown. Breaks and makes contacts when tripped. Resets automatically when power is removed. 12V DC, 30 second time delay, negative ground. Contacts 10 Amps 24V, 14 Amp fuse.