Question 318Electricity & Electronics - QMED

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.