In an initial state where a push rod is pressed down, a base of a movable contact point board supporting a movable contact point makes contact with inclined protruding portions of a moving block by a second spring to be inclined. When the movable contact point makes contact with a fixed contact point following the projecting of the push rod, the base makes contact with stoppers. Thereafter, since the moving block alone rises, the movable contact point board rotates following the end edges of the stoppers according to release of the pressing by the protruding portion. Thereby the movable contact point largely slides and is displaced to the fixed contact point.

A downhole system including a gun string configured to be deployed into a wellbore, the gun string including plural gun assemblies. A detonator block attached to a given gun assembly of the plural gun assemblies. The detonator block includes a switch assembly. The switch assembly includes a communication unit (CU) configured to receive, from an external controller, a fire command to activate a detonator associated with the detonator block, a measuring unit configured to measure a parameter (V) at the switch assembly, and a computing core (CC) configured to locally make a decision whether to activate or not the detonator, after the fire command is received from the external controller, based on whether a voltage measured by the measuring unit at the switch assembly is larger or not than a threshold voltage.

A terminal module (10) is provided with a case (22) and a terminal fitting (16) held in the case (22). The terminal fitting (16) includes a fixing portion (52) to be fixed to the case (22) and a leaf spring portion (54) cantilevered from the fixing portion (52) and deflectably and deformably accommodated in an empty space (20) of the case (22). A contact point portion (64) provided on a tip part (62) of the leaf spring portion (54) is displaced toward the fixing portion (52) and toward one side in a plate thickness direction by deflection and deformation of the leaf spring portion (54) when being pressed by a mating contact point (14).

A terminal module (10) is provided with a case (22) and a terminal fitting (16) held in the case (22). The terminal fitting (16) includes a fixing portion (52) to be fixed to the case (22) and a leaf spring portion (54) cantilevered from the fixing portion (52) and deflectably and deformably accommodated in an empty space (20) of the case (22). A contact point portion (64) provided on a tip part (62) of the leaf spring portion (54) is displaced toward the fixing portion (52) and toward one side in a plate thickness direction by deflection and deformation of the leaf spring portion (54) when being pressed by a mating contact point (14).