Australian Circuit Breaker Sizes

Australian circuit breaker sizes are determined by the amount of current that the breaker can safely interrupt. The size of the breaker is typically expressed in amps, and the correct size for a particular application can be determined by consulting the breaker's manufacturer or by using a circuit breaker sizing chart.

Circuit breakers are used to protect electrical circuits from damage caused by excessive current. When a circuit breaker is tripped, it opens the circuit and stops the flow of electricity. This prevents damage to the wiring and appliances connected to the circuit.

The size of the circuit breaker must be large enough to handle the maximum current that the circuit is likely to draw. If the breaker is too small, it will trip frequently, which can be inconvenient and disruptive. If the breaker is too large, it will not provide adequate protection for the circuit.

When choosing a circuit breaker, it is important to consider the following factors:

  • The maximum current that the circuit is likely to draw
  • The type of load that is connected to the circuit
  • The ambient temperature

Circuit breakers are available in a variety of sizes, styles, and features. It is important to choose a breaker that is suitable for the specific application.

For more information on Australian circuit breaker sizes, please consult the following resources:

  • The Australian Standard AS/NZS 3000:2018 - Electrical installations
  • The Australian/New Zealand Wiring Rules (AS/NZS 3000:2018)
  • The manufacturer's instructions for the specific circuit breaker

By following these guidelines, you can ensure that you choose the correct circuit breaker size for your application and protect your electrical system from damage.


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