Question 318Electricity/Electronics - QMED70% to pass
In the illustrated motor controller, what do the contacts across terminals "3" and "4" of the control circuit represent? Illustration EL-0017
AI Explanation
The correct answer is B) normally closed overload relay contact.
The contacts across terminals "3" and "4" of the control circuit represent a normally closed overload relay contact. This means that under normal operating conditions, the contacts are closed, allowing current to flow through the circuit. However, if an overload condition occurs, the overload relay will trip, opening the contacts and interrupting the circuit to protect the motor from damage.
The other options are incorrect because they do not accurately describe the function of the contacts shown in the illustration. A) thermal overload heater and C) magnetic overload coil are components of the overload protection system, but not the specific contacts depicted. D) normally open overload relay contact is incorrect because the question states the contacts are across terminals "3" and "4", indicating they are normally closed.
Related Questions
#316 What is the primary functional purpose of the KM1 contactor as shown in the illustration? Illustration EL-0080 #317 As shown in figure "B" of the illustration, which of the operations listed will happen when the 'jog button' is pushed? Illustration EL-0010 #319 Referring to figure "B" of the illustrated control circuit schematic diagram, which of the following statements is true when the motor is running in the forward direction? Illustration EL-0011 #320 As shown in the illustration, assuming power is available at the control circuit, which listed action will occur FIRST when the "off-run" switch is placed in the "run" position? Illustration EL-0017 #321 What type of control circuit logic is featured in the electrical schematic diagram for the motor starting circuit shown in figure "B" of the illustration? Illustration EL-0007