Question

Why does an overload Electric circuit catch fire

Answer 1

Overloading a circuit will eventually cause heat, depending on how much overload. More overload then more heat. The heat will eventually melt the plastic insulation of the conductors and allow them to touch causing sparks and even more heat due to the lower resistance of the circuit. Without a fuse in the circuit the current will increase to whatever the supply will give it and the conductors will glow red hot until they melt and will catch anything in contact with them on fire.

Answer 2

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Electrical circuits are designed to handle a limited amount of electricity. An overload occurs when you draw more electricity than a circuit can safely handle. If there were no breaker in the circuit, an overload would cause the circuit wiring to overheat, which could melt the wire insulation and lead to a fire.