Abstract: A fluid switch suitable for use as a fuel shut-off valve is disclosed. In one aspect, the fluid switch includes a housing defining a generally cylindrical bore and having an inlet port, an outlet port and a detent spring passage. A valve member having a spool portion and a detent portion is slidably disposed within the bore. The spool portion can selectively close or open the ports with respect to one another. A detent spring is inserted through the detent spring passage and across the bore to interfit with the detent portion of the valve member to maintain it in the open or closed position in the absence of control inputs. A solenoid core attached to the valve member and solenoid coils surrounding the housing may be provided for moving the valve member between the open and closed positions to operate the fluid switch.