Definition

1. Noun:
   • A safety device in an electrical system: A "circuit breaker" is an automatic switch designed to stop the flow of electricity in a circuit if the current becomes too strong, thereby preventing damage from overload or short circuits.

Usage

• A "circuit breaker" is a specific component found in electrical panels (e.g., in homes, buildings, or industrial equipment). It functions as a reusable safety switch.
• It is used to describe the device itself or its action of interrupting the circuit.
• Example:
• Example:

Examples

• Noun:
  • Every modern home has a circuit breaker box for safety.
  • The power outage was just a circuit breaker shutting off due to a fault.
  • You need to reset the circuit breaker to restore electricity to that room.

Advanced Usage

• "To trip a circuit breaker": This is the common phrase used when the device activates and cuts off power.
  • Using the hairdryer and microwave at the same time might trip the circuit breaker.
• "Circuit breaker" as a metaphorical term: In finance or economics, it can refer to a temporary trading halt on an exchange to prevent panic selling.
  • Stock exchanges have circuit breakers that pause trading during extreme volatility.

Variants and Related Words

• Breaker (n): A common short form for "circuit breaker" in informal contexts (e.g., "Check the breaker box").
• Fuse (n): An older, non-reusable safety device that melts to break a circuit. While similar in function, a fuse is a different component.
• Residual-current device (RCD) / Ground Fault Circuit Interrupter (GFCI) (n): More specialized types of safety switches that protect against electric shock, often found in bathrooms or kitchens.

Synonyms

• Safety switch: A general term for a device that breaks an electrical circuit for protection.
• Overload protector: A descriptive term highlighting its function.

Related Phrases

• Flip the breaker / Switch the breaker back on: The action of manually resetting a tripped circuit breaker to the "on" position.
  • After unplugging the faulty appliance, he flipped the breaker back on.
• Blow a fuse: An idiom (using the older fuse technology) meaning to become very angry, or literally, to cause a fuse to melt.
  • When he saw the mess, he blew a fuse. (idiomatic use)
  • That old lamp blew a fuse. (literal use)

Noun

1. a device that trips like a switch and opens the circuit when overloaded