Final answer:
The two types of breakers in electrical circuits are thermal and magnetic, which protect against excessive current and rapid current variations, respectively.
Step-by-step explanation:
In electrical circuits, the two types of breakers are thermal and magnetic. A thermal breaker uses a bimetallic strip that bends and breaks the connection if overheated by excessive current. On the other hand, a magnetic breaker, such as a Ground Fault Circuit Interrupter (GFCI), responds to changes in magnetic field caused by current variations, rapidly interrupting the electric circuit to protect against electric hazards.