What is a key feature of a thermo-magnetic breaker?

A thermo-magnetic breaker is specifically designed to provide protection against both overloads and short circuits. The key feature of this type of circuit breaker is its dual mechanism of operation: it utilizes thermal protection to respond to overload conditions and magnetic protection for quick interruption during short circuit situations.

When an overload occurs, the thermal element heats up and eventually trips the breaker after a predetermined period, which allows for temporary overload situations without immediately interrupting the circuit. In contrast, during a short circuit condition, the rapid increase in current generates a magnetic field that triggers an instantaneous trip, protecting the circuit from damage. This combination of features enables thermo-magnetic breakers to effectively safeguard electrical systems from a range of potential fault conditions.

Other options do not encompass the fundamental principle that underscores the operation of a thermo-magnetic breaker, thereby highlighting why the correct answer accurately captures its essential functionality.