Final answer:
Current sensitive relays and centrifugal switches have different functions; the former detects excessive current for protective purposes, while the latter disconnects the start winding of a motor based on speed.
Step-by-step explanation:
A current sensitive relay and a centrifugal switch do not serve the same function, though they can both be part of electric motor control circuits. A current sensitive relay is a device that operates when the current flowing through it exceeds a predetermined level, typically used for protection and control purposes. In contrast, a centrifugal switch is employed in single-phase induction motors to disconnect the start winding of the motor once it has reached a certain speed, which is determined by centrifugal force.
The current sensitive relay is commonly used in applications where there is a need to detect overcurrent conditions that could lead to circuit damage or other hazardous situations. It serves to protect the circuit by either tripping a breaker or by activating an alarm. Conversely, the centrifugal switch is more of a mechanical device specifically designed for the motor start-up process, ensuring that the start winding is only engaged when necessary for the initial torque required to bring the motor up to speed.