A fuse in a household electrical circuit is designed to automatically "blow," or break the circuit, when a threshold amperage (amount of electrical current) is exceeded. This protects the appliances that are on the circuit, as well as the house's wiring.
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Two Reasons a Fuse Blows
A fuse blows because a circuit becomes overloaded. This happens for one of two reasons. One, there is too much load on the circuit--there are too many appliances drawing power at once. Two, there is a sudden surge of power that temporarily overloads the circuit.
The usual installation for a home dryer uses a circuit breaker. A circuit breaker works very much like a fuse, except it is designed to carry a heavier load. A circuit breaker that blows can be reset by flipping a switch; a fuse partially melts and has to be replaced.
All recently built houses will have the dryer on its own 40 to 50 ampere circuit breaker. Older houses will have fuse boxes, and the dryer might share a circuit with other appliances.
Fuse Box--Older Houses
If the circuit is shared with other appliances, or even an overhead light bulb, turning on those other appliances while the dryer is running might overload the circuit and blow the fuse. The best solution is to rewire the circuit with higher-load wire and circuit breakers.
Circuit Breaker Trips
If you have a newer house with the dryer the only appliance on its circuit and the breaker repeatedly trips, your dryer could have an electrical fault, most likely with its motor. Even a momentary surge in power drawn will trip the breaker. This generally means that the dryer will need a new motor or that you will need a new dryer.
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