Which statement describes the current limiter used in heavy-current draw circuits?

• A. Current limiter
• B. Glass tubular fuse
• C. Push-to-reset circuit breaker
• D. Relay

Answer: (A)

In heavy-current draw circuits, the goal is to prevent the current from exceeding a safe maximum while the load changes. A current limiter is designed to do exactly that: it actively constrains the current to a set value, so the circuit operates within safe heating and component limits regardless of fluctuations in load or supply voltage. This ongoing regulation is different from fuses or push-to-reset circuit breakers, which protect by disconnecting the circuit when an overcurrent event occurs but do not continuously manage the current at a fixed level. A relay, on the other hand, is just a switch controlled by another signal and does not inherently limit current. So the device described as the limiter that controls maximum current in heavy-current situations is the current limiter.