Descriptors | Graphic symbols, Symbols, Data representation, Graphic representation, Circuit diagrams, Switchgear, Electric control equipment, Contactors, Switches, Electric contacts, Delay circuits, Control switches, Limit switches, Proximity switches, Position switches, Selector switches, Mercury switches, Block diagrams, Circuit-breakers, Isolator switches, Electric starters, Relays, All-or-nothing relays, Polarized relays, Measuring relays, Protective relays, Pushbutton switches, Switch-fuses, Fuses, Electrical protection equipment, Fire extinguishers |