In a wiring diagram for a motor with a starter, where are the overloads (heaters) typically drawn?

• A. Between the motor and the starter
• B. Between the power contacts and the motor
• C. Parallel to the motor circuit
• D. Before the starter contacts

Answer: (B)

In a wiring diagram for a motor with a starter, the overloads (heaters) are typically drawn between the power contacts and the motor. This placement serves a critical safety function. The overload relays are designed to protect the motor from overheating due to excessive current, which can occur when the motor is overloaded or experiences a fault.

By positioning the overloads after the starter contacts in the circuit, they can effectively sense the current flowing to the motor. If the current exceeds a predetermined level, the overloads will trip, interrupting the power supply to the motor and preventing damage. This arrangement ensures that the entire motor circuit is monitored, contributing to the reliability and longevity of the motor.

Additionally, positioning the overloads in this manner allows for a clear separation between the control section of the starter and the power load, which is essential for effective circuit control and protection.