Electrical Schematic Symbols And Definitions
SENR6616 February 1994
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Pressure Symbol
Circuit Breaker Symbol
Flow Symbol
Level Symbol
Temperature Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Normally closed switch that will open with an increase of a specific condition. No circle indicates that the wire cannot be disconnected from the component. This indicates that the component has a wire connected to it that is connected to ground. This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine. Reed Switch - A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
930t Series II Wheel Loader
Sender- A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.
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Relay (Magnetic Switch) - A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay.
17B2000-UP
Solenoid - A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work.
Harness And Wire Symbols Pin
Socket
Wire Color
A
Circuit Number Identification
AA
105-9344
Receptacle
Wire Gauge
Ground Connection
Fuse
1
325-PK-14
Single Wire Connector
Component Part Number
Wire, Cable, or Harness Assembly Identification
Plug
2
200-BK-14
Pin or Socket Number 1 2
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
© 2003 Caterpillar All Rights Reserved
SENR6616-00 4 Page, B/W, D.M.
1 2
Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets. Printed in U.S.A.