Introduction to Circuit and Motor Protection – CIRCUIT PROTECTION (8) – Finish

A bimetal breaker responds in an inverse time manner. As the current passes, it bends the bimetal breaker and makes the circuit trip (see Figure 23).

A magnetic breaker has an electromagnet element which responds to a high current generated by a short circuit. The activation in a magnetic breaker is instantaneous (see Figure 24).


Therefore, the most desirable circuit breaker has both bimetal and magnetic mechanisms: an element that responds to time delay and an element that responds instantaneously (see Figure 25).

The symbols shown in Figure 26 represent a thermal-magnetic circuit breaker. Notice that one side represents the bimetal or thermal mechanism and the other side represents the magnetic component.

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