Thermal circuit breaker has
A. delayed trip action
B. instantaneous trip action
C. both of the above
D. none of the above
Answer:A
Thermal circuit breaker has
A. delayed trip action B. instantaneous trip action C. both of the above D. none of the above
Explanation: This type depends upon the effect of heat on a bimetal strip for its operation. Such a strip bends on heating and, in the thermal circuit breaker, bending of the strip causes contact to open, which breaks the circuit. The bimetal strip is usually in series connection in the electrical circuit, its temperature being governed by the current flowing through it. As the current increases, the temperature of the bimetal strip rises, bending more the hotter it becomes.