Discrete semiconductor transient suppression devices such as the Metal-oxide Varistor, or MOV, are by far the most common as they are available in a variety of energy absorbing and voltage ratings making it possible to exercise tight control over unwanted and potentially destructive transients or over voltage spikes. Transient suppression devices can take on many forms from arc contacts, to filters, to solid state semiconductor devices. Either way, transients are bad as they can damage electronic equipment and therefore need to be suppressed and controlled. We must also realise that voltage transients do not always start at zero volts or at the beginning of a cycle, but can be superimposed onto another voltage level. This sudden release of energy back into the circuit due to some switching action creates a transient voltage spike in the form of a steep impulse of energy which can in theory be of any infinite value. Transients are very steep voltage steps that occur in electrical circuits due to the sudden release of a previously stored energy, either inductive or capacitive, which results in a high voltage transient, or surge being created. These inductive switching voltage transients can reach the 1,000’s of volts. The rapidly collapsing of its magnetic field induces a transient voltage which becomes superimposed onto the steady-state supply. ![]() Inductive switching transients occur when some form of inductive or reactive load, such as a motor, a solenoid coil or a relay coil, is suddenly switched off. However, the switching of AC inductive loads or the switching of DC relay contacts and DC motors all combine to produce a quality of power supply that is difficult to maintain and so Transient Suppression Devices are required We would like to think that the AC or DC power supplies we use to power our circuits are both clean and well-regulated supplies.
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