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Metal-oxide varistor manufactured by Siemens & Halske AG. Modern varistor schematic symbol, which is the same as a thermistor symbol [1]. A varistor (a.k.a. voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. [2]
A metal-oxide varistor (MOV) consists of a bulk semiconductor material (typically sintered granular zinc oxide) that can conduct large currents when presented with a voltage above its rated voltage. [ 13 ] [ 29 ] MOVs typically limit voltages to about 3 to 4 times the normal circuit voltage by diverting surge current elsewhere than the ...
Strontium titanate is an oxide of strontium and titanium with the chemical formula Sr Ti O 3.At room temperature, it is a centrosymmetric paraelectric material with a perovskite structure.
Metal-oxide varistor (MOV) + Up to 70 000 Amps surge + Lifetime @ 100 Amps, 8x20 uS pulse shape: 1000 surges - Shunt capacitance >500 pF - Leakage approximately 10 micro amps Avalanche diode + Lifetime @ 50 Amps, 8x20 uS pulse shape: infinite + Shunt capacitance: 50 pF - Low surge capability: 50 Amps @ 8x20 uS pulse shape - Leakage ...
In some DC circuits, a varistor made of inexpensive metal oxide, called a metal oxide varistor (MOV) is used. They may be unipolar or bipolar, like two inverse-series silicon Zener diodes, but are prone to wear out after about a dozen max-rated joules of energy absorption such as lightning protection, but are suitable for lower energy.
A common type of axial-leaded resistor today is the metal-film resistor. Metal Electrode Leadless Face resistors often use the same technology. Metal film resistors are usually coated with nickel chromium (NiCr), but might be coated with any of the cermet materials listed above for thin film resistors.
Metal oxide varistor (MOV), surge absorber, TVS – Over-voltage protection; Inrush current limiter – protection against initial Inrush current; Gas discharge tube – protection against high voltage surges; Spark gap – electrodes with a gap to arc over at a high voltage; Lightning arrester – spark gap used to protect against lightning ...
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