An assembly including a support housing and an actuator device (20). The actuator device (20) includes an extendable initiator cup (22) including at least one non-random fold (40) and at least in part defining a storage chamber (26) containing a reactive charge (28) reactable to produce reaction products. The extendable initiator cup (22) longitudinally extends from a first length to a second greater length upon reaction initiation of the reactive charge (28). The extendable initiator cup (22) is at least partially disposed within a longitudinally extending bore of the support housing (260). The support housing (260) is effective to limit lateral expansion of the extendable initiator cup (22) upon reaction initiation of the reactive charge (28). The assembly can include an electrical conductive member (250) or an electrical switch. The extendable initiator cup (22) can extend to sever the electrical conductive member (250) or disengage the electrical switch, thereby interrupting the conduction of electricity through an electrical system. Alternatively, the extendable initiator cup (22) can extend to engage the electrical switch thereby allowing the conduction of electricity through an electrical system.