Normally Open:

A term used to describe contacts which interrupt the circuit when in their normal position.

PCB:

Printed circuit board.

Shroud:

A wall or housing that surrounds a switch, button or toggle to protect the switch from accidental operation.

Life Mechanical:

The number of cycles of operation that a switch will perform with no voltage applied to the contacts.

Limit Switch:

A type of switch used to determine the position of a moving component that activates it.