Contents
What is the symbol for varistor?
The varistor circuit symbol can be seen to be very similar to that of a thermistor. It consists of the basic resistor symbol of a rectangle with a diagonal line through it that has a small added section parallel to the body of the resistor symbol. This indicates the no-linear nature of the varistor.
What is varistor and for what it is used for?
Varistors are used to protect a circuit from high voltage surges. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit. A capacitor may be installed across the signal lines.
Is varistor a semiconductor?
Nowadays the resistive body of a varistor is made from semiconductor material making it a type of semiconductor resistor with a non-ohmic symmetrical voltage and current characteristics suitable for both AC and DC voltage applications.
How does a varistor work?
This is how a varistor works in a circuit: When the voltage to a circuit is low or within acceptable limits, the varistor has a very high resistance. Since the varistor has such a high resistance, current does not flow through it; instead it flows to the device which needs power in the circuit.
What does varistor mean?
Definition of varistor in English: varistor. noun. A semiconductor diode with resistance dependent on the applied voltage. ‘The range is built by optimising combinations of various styles of inductors with the appropriate capacitors, varistors and other components to give a comprehensive range of suppression levels.’.
What is a MOV circuit protection?
MOV Definition and General Electrical Circuit Protection. MOV Definition. – A Metal Oxide Varistor (MOV) is a voltage suppression device that filters and clamps the transient in an electrical circuit. A Varistor is a Variable Resistor, sometimes referred to as Voltage Dependant Resistors (VDRs) by some manufacturers.
What is a voltage dependent resistor?
A special type of resistor whose resistance can be varied by varying the applied voltage is termed as a voltage dependent resistor (VDR) and is also simply called as varistor. It is a non-linear semiconductor element and its name is obtained from the words variable resistor.