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  • Chapter 9: Aircraft Electrical System › Current Limiting Devices › Circuit Breakers

    Circuit Breakers A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by an overload or short circuit. Its basic function is to detect a fault condition and immediately discontinue electrical flow ... Unlike a fuse that operates once and then has to be replaced, a circuit breaker can be reset to resume normal operation. All resettable circuit breakers should open the circuit in which they are installed regardless of the position…

  • Chapter 12: Fundamentals of Electricity & Electronics › Circuit Protection Devices › Circuit Breaker

    Circuit Breaker The circuit breaker is commonly used in place of a fuse and is designed to break the circuit and stop the current flow when the current exceeds a predetermined value. Unlike the fuse, the circuit breaker ... Schematic symbol for thermistor. Figure 12-66. Photoconductive cell schematic symbol component. There are several types of circuit breakers in general use in aircraft systems. One is a magnetic type. When excessive current flows in the circuit, it makes…

  • Chapter 12: Fundamentals of Electricity & Electronics › Basic Circuit Analysis & Troubleshooting › Troubleshooting Open Faults in a Parallel Circuit

    Tracing Shorts with the Voltmeter To locate the shorted resistor while the circuit is functioning, a voltmeter can be used. Figure 12-182 illustrates that when a voltmeter is connected across any of the resistors that are not shorted ... scale. When it is connected across the shorted resistor, the voltmeter reads zero. Troubleshooting Open Faults in a Parallel Circuit The procedures used in troubleshooting a parallel circuit are sometimes different from those used in a series circuit. Unlike…