Theory And Diagnostic Information; Electrical Component Symbols - Jacobsen AR-3 Technical/Repair Manual

ELECTRICAL
Theory and Diagnostic
Information

Electrical Component Symbols

The following symbols are used in the electrical
schematics to represent various electrical components.
1
Switches
4
1 The sample switch symbols shown are just a few of the many switch configurations. Switches are
designated by the number of "poles" (circuits controlled) and "throws" (actuator positions). Unless otherwise
specified, switches are shown in the "Normally Open" (N.O.) position.
Switching Devices
t˚
86 30
85 87 87A
Circuit Protection Devices
4-6
Single Pole, Single Throw
(SPST)
Single Pole, Double Throw
(SPDT)
Temperature Switch
Relay
Fuse
Double Pole, Single Throw
(DPST)
Double Pole, Double Throw
(DPDT)
Pressure Switch
P
Circuit Breaker
4181384 First Edition