MOV Surge Protection for LED Drivers and Outdoor Lighting
LED lighting combines long expected service life with exposure to switching transients, long outdoor cables and lightning-induced surges. An MOV...
MOV Protection for AC-DC Power Supplies: Placement, Fusing and Coordination
An MOV at the input of an AC-DC power supply can limit short-duration overvoltage, but its effectiveness depends on placement,...
MOV Standards and Approvals: IEC 61051, IEC 61643 and UL 1449
“Compliant MOV” can mean very different things depending on whether the subject is a component, a complete piece of equipment...
IEC 61000-4-5 Surge Test Explained: Waveforms, Coupling and Interpretation
IEC 61000-4-5 is an electromagnetic compatibility (EMC) immunity test for equipment exposed to surge transients. It defines a repeatable laboratory...
MOV Placement: Line-to-Line vs Line-to-Ground Protection
An MOV placed across line and neutral does not solve the same problem as an MOV placed from line to...
Can MOVs Be Connected in Series or Parallel?
MOVs can be drawn in series or parallel on a schematic, but the connection does not automatically multiply the rating....
MOV Failure Modes and Thermal Protection
A metal-oxide varistor (MOV) protects a circuit by conducting transient current when voltage rises into its nonlinear region. That useful...
MOV Marking Codes and Part Numbers Explained
Clear answers to common questions about MOVs, MLVs, SMD varistors, MCOV, V1mA, markings, failure modes and device selection.
MOV Protection Circuit Basics: Placement, Fusing and Layout
Learn where an MOV sits in a protection circuit, what a fuse can and cannot do, why thermal disconnection matters,...
MOV Surge Waveforms Explained: 8/20 μs, 10/1000 μs and IEC 61000-4-5
Understand how common surge waveforms differ, why MOV ratings cannot be transferred between them, and how component pulse ratings relate...
