🔍 Key Concepts

• Time lag (dual-element) fuses and why they are different from normal fuses • What happens electrically during motor starting / inrush current • Which circuits on a ship must trip immediately on even a small overload for safety

💭 Think About

• Think about which type of circuit experiences a brief, high inrush current under NORMAL operation but should NOT trip during that brief surge. • Ask yourself: which circuits must be protected so that even a small overload or fault causes an IMMEDIATE interruption of power for safety? • For each answer choice, decide: would a short delay in blowing the fuse be desirable, or would it be dangerous?

✅ Before You Answer

• Identify which circuit type regularly has short-duration high starting current compared to its running current. • Decide which circuits (like alarms or emergency lighting) must have fast-acting protection to avoid any risk of losing them in an emergency. • Confirm that time lag / dual-element fuses are specifically designed to tolerate brief overcurrents but still protect against sustained overloads and short circuits.