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What colour insulation leads would you use to colour code the leads of a thyristor?
CameronBarker
Red for anode, black for cathode, blue for gate.
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∙ 10y ago
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Can a thyristor work as a circuit breaker?
A thyristor is primarily a very fast "switch-on" device and is not designed to be used as a "switch-off" device.A circuit breaker is primarily a "switch-off" device which is used to automatically break the flow of current from a source to a load whenever the amount of current exceeds the rated current value of the breaker.So, because a thyristor does not, all by itself, "open" a circuit, a thyristor cannot be used to work as a circuit breaker.NotesCurrent flow through a thyristor can only stop if - external to it - the current flowing through it gets reduced to below its minimum holding current or, of course, to zero, as would happen either:i) if the load was disconnected from it by a separate circuit breaker that is wired into the circuit between the thyristor and the load;orii) if the source was disconnected from it by a separate circuit breaker that is wired into the circuit between the supply and the thyristor.Further notesA thyristor is designed to close or "make" a circuit whenever:a) an appropriate value of trigger voltage is put onto its gateand then only if:b) the current from the source to the load can flow through it in its "forward" direction.One way of ensuring it automatically disconnects the load from the source is to use an alternating current supply and always "trigger" the thyristor so that it turns on during each positive-going part of each ac cycle.Then, whenever the ac supply voltage returns to zero at the end of each positive half-cycle (after which it goes into the negative half-cycle) the thyristor will automatically break any further flow of current.By using other electronic circuitry to determine exactly when the gate is triggered (earlier or later in each positive-going part of each cycle) the amount of power supplied to the load can be controlled very accurately.That is why the main application for thyristors is to provide a precisely controlled way too use alternating currents to allow varying amounts of power to be supplied to electrical loads.
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The 3 wires on a Thyristor are colour coded in order not to connect the wrong wire to the incorrect part of the circuit. The three wires are called: anode (OV), cathode (output) and gate (input signal). Sorry I don't know the colours but I hope this helps.
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