Varistor (MOV) symbol
Also called MOV, Metal oxide varistor, Voltage dependent resistor, VDR
A resistor whose resistance drops sharply above a set voltage, so it clamps surges. Marked U for voltage dependent.
ANSI / IEEE
IEC 60617What the varistor (MOV) symbol means
A resistor whose resistance drops sharply above a set voltage, so it clamps surges. Marked U for voltage dependent.
ANSI and IEC symbols
Where you see it
Surge protection across supplies, contactor coils and electronics inputs.
What is written next to it
On a schematic, the varistor (MOV) usually carries its designator and clamping voltage, such as RV2 275 V AC.
Related symbols
Frequently asked questions
What does the varistor (MOV) symbol look like?
On ANSI drawings: A rectangle with a Z-shaped line through it, sometimes marked U or V. In IEC 60617: The same rectangle with a bent line, marked U.
Is the varistor (MOV) symbol the same in IEC and ANSI?
Yes, it is drawn the same way in most legends.
Where is a varistor (MOV) used?
Surge protection across supplies, contactor coils and electronics inputs.
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