Murphy Shutdown Relay - 518 Series

The 518 series are manually operated relays where the red button must be physically held in to bypass initial shutdown conditions eg low oil pressure.  One these initial shutdown conditions have been bypassed, the button can be released and the relay will function until a shutdown condition is reached eg high engine temp.  These relays have a NC and NO output and shutdown is triggered by receiving a ground on the SW1/2 terminals.  There are 12 and 24 volt DC versions available.

Design to be used with Switch Gauges.