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Snap-Acting Switches
MAINTENANCE AND REPLACEMENT OF SWITCHES

Neets Module 03-Introduction to Circuit Protection, Control, and Measurement
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3-14 marked C, NO, and NC. These letters stand for common, normally open, and normally closed. The common terminal is connected to the normally closed terminal until the plunger is depressed. When the plunger is depressed, the spring will "snap" into the momentary position and the common terminal will be connected to the normally open terminal. As soon as the plunger is released, the spring will "snap" back to the original condition. This basic accurate snap-acting switch is used in many applications as an automatic switch. Several different methods are used to actuate this type of switch. Some of the more common actuators and their uses are shown in figure 3-14. Figure 3-14.—Common actuators and their uses for accurate snap-acting switches. Q10.   What classification of a switch is used when you describe it as a rocker switch? Q11.   In describing a switch by the number of positions of the actuator, what are the two possible configurations for a single-pole, double-throw switch? Q12.   What type of switch should be used to control a circuit that requires a temporary actuation signal? Q13.   What type of switch is used if it is necessary to guard against a circuit being accidentally turned on or off? Q14.   What is the common name used for an accurate snap-acting switch?






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