Which of the following statements represents the main difference between an electromagnetic relay and an electromagnetic contactor as used in motor control and power circuits?
• Function and typical use of an electromagnetic relay vs an electromagnetic contactor in motor/power circuits • Current and power handling capability of each device • Where each device is normally found in a shipboard electrical system (control vs power circuits)
• Think about which device is normally used to switch large motors on and off from a distance. • Consider which device is usually found in low‑power signal/control circuits rather than in the main power lines to the motor. • Ask yourself: in practice, which devices have larger, heavier-duty contacts designed to interrupt higher currents?
• Verify which option talks about load/current handling capability rather than how the devices are connected. • Check whether series vs parallel connection is really what distinguishes relays and contactors in real installations. • Confirm from your basic electrical theory which device is specified and rated for heavier loads and frequent switching in motor circuits.
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