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*Instructions are at the bottom*
This circuit represents a fuse modular terminal with integrated LED. These fuses are commonly used in cabinets for automation to protect the (24Vdc) control circuit. A glass type fuse is placed into an hinge opening part of the terminal. This hinge opening part is also used for interupting the circuit for maintenance. Parallel to the fuse is a (red) LED in series with a resistor. When the current flows through the fuse, the voltage will be the same on both sides of the LED. No current will flow through the LED. When the fuse melts, the LED will be placed in series with the circuit behind the fuse. Because of this, current will flow through the LED, which will emit light. The resistance of the circuit behind the fuse will be low enough for the LED to work.
How to use:
On top there's a 24 Vdc power supply. Underneath that, there's a switch for powering the circuit. Beneath that, the fuse modular terminal is placed with a switch (the fuse) and the LED with resistor. At the bottom there are 3 lamps which will represent the circuit behind the fuse.
Close the top switch, letting current flow through the circuit. Notice the LED will not emit light, because the voltage on both sides of it, is the same. The 3 lamps will be on.
Open the fuse switch, placing the LED in series with the rest of the circuit. Notice the LED will emit light. The 3 lamps will not burn, or very weak.
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