Abstract: An in line switch device (1) includes a switch housing (3, 4) providing a switch component chamber. A switch actuator (8, 9) is operable from the exterior of the switch housing (3, 4). At least two sets of switch terminals (17, 18, 19, 20, 21, 22) are accessible from the exterior of the switch component chamber and are covered by a removable closure or respective removable closures (26, 27). The removable closure(s) has two cable apertures (28) for passage of respective power cables to be connected to respective sets of switch terminals (17, 18, 19, 20, 21, 22). A first sealing device (29, 30) is associated with each cable aperture (28) for sealing around the associated power cable. The removable closure(s) (26, 27) are engaged with the switch housing (3, 4) with one or more second sealing devices (14, 15) provided at the interface between the or each removable closure (26, 27) and the housing (3, 4).

Abstract: A switch mechanism opens a contact set in the event of an electrical fault condition. The mechanism involves a contact lever biased by a spring for pivoting about one or other of two fulcrums to open or close the contacts respectively. The fault condition results in an out of balance current flow which causes a solenoid to release a plunger initiating operation about a fixed fulcrum to open the contacts. A reset device is used manually to initiate operation about a movable fulcrum to reclose the contact set, provided the fault condition has been removed. An arm is deflected by the plunger to shift the movable fulcrum and also acts to restore the plunger as the mechanism is tripped. The switch mechanism may be incorporated in a residual current device (ground fault circuit interrupter) which provides a detection circuit to trip the mechanism.

Abstract: A switch mechanism opens a contact set in the event of an undervoltage condition. The mechanism involves a lever assembly biased by a spring for pivoting about one or other of two fulcrums to open or close the contacts respectively. The undervoltage causes a solenoid to release a plunger which initiates operation about a fixed fulcrum. A reset device is used manually to initiate operation about a movable fulcrum, provided that the voltage is sufficient. An arm is deflected by the plunger to shift the movable fulcrum and also acts to restore the plunger during reset. The switch mechanism may be incorporated in a residual current device which provides the undervoltage condition on detecting an electrical fault.