1.2 Scope of This Section

This section covers definitions, terminology, and symbols of relays for general switching purposes, military applications, electronic circuits, and airborne and space-age equipment. Certain specialized forms of relays have their own set of standards and may be designated by other terms.
For a discussion of relays associated with electric power apparatus see Relays and Relay Systems Associated with Electric Power Apparatus, C37.90-1971 of the American National Standards Institute. Also, see NEMA Standard for Industrial Control, ICI-1954, as revised to May, 1958, or later.