Break-make pushbutton switch: Break-before-make pushbutton is a switch whose top level section contacts are Normally Closed (NC) and bottom level section contacts are Normally Open (NO). The top level contacts will be opened before the bottom level contacts get closed when the pushbutton is pressed. An electrical symbol used to represent break-make pushbutton switch is given below. Given: The conventional hardwired relay circuit should perform the following circuit functions when two break-make pushbuttons are used. The light L1 must turn ON when pushbutton PB1 is pressed. The light L2 must turn ON when pushbutton PB2 is pressed. The pushbuttons must be interlocked electrically, such that L1 and L2 cannot be turned ON simultaneously.

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Chapter 6, Problem 2P

Program Plan Intro

Break-make pushbutton switch:

Break-before-make pushbutton is a switch whose top level section contacts are Normally Closed (NC) and bottom level section contacts are Normally Open (NO).

The top level contacts will be opened before the bottom level contacts get closed when the pushbutton is pressed.

An electrical symbol used to represent break-make pushbutton switch is given below.

Given:

The conventional hardwired relay circuit should perform the following circuit functions when two break-make pushbuttons are used.

The light L1 must turn ON when pushbutton PB1 is pressed.

The light L2 must turn ON when pushbutton PB2 is pressed.

The pushbuttons must be interlocked electrically, such that L1 and L2 cannot be turned ON simultaneously.

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