3-1
CHAPTER 3
CIRCUIT CONTROL DEVICES
LEARNING OBJECTIVES
Upon completion of this chapter you will be able to:
1.
State three reasons circuit control devices are used and list three general types of circuit control
devices.
2.
Identify the schematic symbols for a switch, a solenoid, and a relay.
3.
State the difference between a manual and an automatic switch and give an example of each.
4.
State the reason multicontact switches are used.
5.
Identify the schematic symbols for the following switches:
Single-pole, double-throw
Double-pole, single-throw
Double-pole, double-throw
Single-break
Double-break
Rotary
Wafer
6.
State the characteristics of a switch described as a rocker switch.
7.
State the possible number of positions for a single-pole, double-throw switch.
8.
Identify a type of momentary switch.
9.
State the type of switch used to prevent the accidental energizing or deenergizing of a circuit.
10.
State the common name for an accurate snap-acting switch.
11.
State the meaning of the current and voltage rating of a switch.
12.
State the two types of meters you can use to check a switch.
13.
Select the proper substitute switch from a list.
14.
State the conditions checked for in preventive maintenance of switches.
