Australian Standard Circuit Breaker Sizes

Australian Standard Circuit Breaker Sizes

Circuit breakers are an essential part of any electrical system, and their size is an important consideration for safety and reliability. The Australian Standard AS/IEC 60898-1 specifies the minimum sizes of circuit breakers for different applications.

The size of a circuit breaker is determined by its current rating, which is the maximum current that the breaker can safely interrupt. The current rating is expressed in amps (A).

The table below shows the minimum current ratings for circuit breakers for different applications, as specified by AS/IEC 60898-1.

| Application | Minimum Current Rating (A) | |---|---| | General lighting | 10 | | Power outlets | 16 | | Cookers | 20 | | Air conditioners | 32 | | Electric water heaters | 40 |

It is important to choose a circuit breaker with a current rating that is appropriate for the application. A circuit breaker that is too small for the application may not be able to protect the circuit from overloads or short circuits, while a circuit breaker that is too large for the application may not provide adequate protection against nuisance tripping.

If you are not sure what size circuit breaker you need, you can consult with an electrician.

In addition to the current rating, there are other factors to consider when choosing a circuit breaker, such as the voltage rating, the type of trip mechanism, and the interrupting rating.

The voltage rating of a circuit breaker is the maximum voltage that the breaker can be used with. The interrupting rating of a circuit breaker is the maximum current that the breaker can interrupt without damage.

The type of trip mechanism determines how the circuit breaker is triggered. There are two main types of trip mechanisms: thermal and magnetic.

Thermal trip mechanisms are triggered by an increase in temperature, while magnetic trip mechanisms are triggered by a sudden increase in current.

When choosing a circuit breaker, it is important to consider the specific application and the environmental conditions in which the breaker will be used. By choosing the right size and type of circuit breaker, you can ensure the safety and reliability of your electrical system.


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