The Viking CS03FTGPR390 is a manual reset, normally closed (NC) open frame plunger limit switch. It is designed for use in harsh industrial and factory environments, where it can be used for a range of safety, security, and general automation applications. The switch features an aluminum body, gold-plated contacts, stainless steel actuator pin, and an IP67 rated NEMA 4x enclosure. It is designed to open and close when an external force is applied to the plunger, providing a direct mechanism for actuation. The switch is compatible with most standard enclosure systems and can be used with a range of control systems and automation components.