Construction Of Automatic Phase Changer

The curent bpath within a typical fuse is through the end caps or ferrules to a metallic fusible element the resistance of the fusible element develop heat that cause a portion of the matalto malt or disintegrate upon reaching the melting temperature of the metal. This property is exploited to achieve accurate thermal activation of a fuse in response to a particular level of over load current. In normal operation, the temperature of the device remain relatively law and the resistance of the device also remain low when on overload current flow through the device the internal temperature of the fuse rises sufficiently to cause the fuse to electrically open an alloy type thermal fuse is widely used as a thermo protector for an electrical appliance or a circuit element for example a semi conductor device a capacitor or a resistor such an alloy type thermal fuse has a configuration in which an alloy of a predetermined melting point is used as a fuse element and the flux applied element is seated by an insulator.
A time delay fuse is a type of fuse that designed to allow temporary and harmless currents to pass there through without triggering the fuse time delay fuses are typically used in circuit subject to temporary transient such as motor starting currents.
Time delay fuses often employ a fusible element and a spring loaded heat mass a deposit of solder retains the heat mass from movement by the spring. The dimension of fusible element is selected such that it melts quickly under short circuit condition.
Solid state fuses are also known which transistor and thyristors are placed in series with the load and turnoff in response to a load fault condition.
fuse are commonly used in automotive element system to protect circuits against damage caused by overload condition fuse for various often grouped together at clustered location where circuit junction exist in a fuse box power distribution block or junction block many automotive vehicle are equipped with a fuse junction box which service to hold a plurality of fuses associated with the various electrically powered device of the vehicle.
Fuse are commonly used in integrated circuits to provide reblundancy programming capabilities such fuses can provide for redundancy for the purpose of preventing education of yield of the semi conductor device which may be caused by random defects generated in the manufacturing process.
Fuse are typically used in the design of monolithic integrated circuits (ic) and in particular in memory device as element for altering the configuration of the circuitry conta1ined there in to increase yield integrated circuit such as memory chips it is common to include redundant memory cell on the chip if a memory circuit is found to be defective or is not needed, the fuse May be blown thereby activating or deactivating the redundant memory cells