In what configuration should a fuse or circuit breaker be connected for circuit protection?

For effective circuit protection, a fuse or circuit breaker should be connected in series with the load. When connected in series, the fuse or breaker provides a direct path for current flow from the power source to the load. This configuration ensures that all the current flowing to the load also passes through the protective device.

If there is an overload or a short circuit, the increased current will cause the fuse to blow or the circuit breaker to trip, interrupting the flow of electricity and protecting the circuit from damage. This is crucial because it prevents excessive current from reaching the wiring and devices connected to the circuit, which could lead to overheating, fires, or failure of components.

The other configurations do not provide the same level of protection. For instance, connecting a fuse in parallel would not interrupt current flow through the load in case of a fault, allowing potentially harmful levels of current to continue flowing. Thus, series configuration is essential for effective circuit protection.