125
M4.1-2720-005
03 Rev. 10/06
ELECTRICAL
Electrical System
Switches
Switch symbols convey:
1. Type of switch.
2. Number of terminals.
3. Momentary or maintained contact.
4. How the switch is held and wired.
5. How the switch is activated.
6. Application.
Type of Switch
• With common
or
• Without common
or
Number of Terminals
• All terminals are shown even if not wired.
Momentary or Maintained Contact
• Momentary contact is a shaded triangle.
or
• Maintained is an open circle (an open circle also
denotes the common terminal).
or
How the Switch is Held and Wired
To determine how the switch is held and wired, look
closely at the contact symbols. An open circle denotes
a maintained contact so therefore it is the normally
closed terminal. A shaded triangle denotes a momen-
tary contact, therefore it is the normally open terminal.
Switches having more than one maintained contact do
not have a normally open or normally closed terminal,
although they may have a common. Symbols for these
switches include the markings present on the actual
switch.
Example:
Figure 8115-01
Figure 8116-01
Figure 8117-01
Figure 8118-01
Figure 8119-01
Figure 8120-01
Figure 8115-01
Figure 8117-01
Figure 8121-01
Crown 2000 PF11845-5 Rev. 10/06
To Next Page
Loading...