Bourns MOV-KC Metal Oxide Varistors

Introduction

Bourns MOV-KC metal oxide varistors are radial-leaded surge protection components designed to help safeguard electronic circuits from damaging voltage transients. As passive protection devices, they respond rapidly to overvoltage events and divert excess energy away from sensitive circuitry.

Part Description

The MOV-KC series from Bourns consists of metal oxide varistors (MOVs) with radial leads for through-hole PCB mounting. These devices use a copper-based electrode construction and are available in a range of disc diameters and voltage ratings to support different protection requirements.

Under normal operating conditions, an MOV presents a high resistance and has little effect on the circuit. When a transient overvoltage occurs, its resistance drops sharply, allowing surge current to be shunted or clamped. This behavior helps limit the voltage experienced by downstream components.

Bourns MOV-KC varistors are intended to handle fast, high-energy surge events associated with lightning activity, power-line disturbances, inductive loads, accidental power contact, and power induction. Their fast response time and high surge-current capability make them suitable for general-purpose circuit protection designs.

Applications

Potential applications for Bourns MOV-KC varistors include:

• AC mains input surge protection
• Switched-mode power supplies
• Power adapters and chargers
• Consumer appliance protection
• Industrial control equipment
• Relay, solenoid, and motor transient suppression
• LED lighting drivers
• Telecom and communication equipment
• Smart meters and energy-monitoring systems
• Electrical distribution and control panels
• Battery charging systems
• Home automation devices

Industries

Bourns MOV-KC metal oxide varistors can be used in a variety of industries, including:

• Consumer electronics
• Industrial automation
• Power and energy
• Building automation
• Lighting and LED systems
• Telecommunications
• Home appliances
• Transportation electronics
• Security and access-control systems
• HVAC equipment
• Test and measurement
• Renewable energy systems

Usage Ideas

1. AC Power Entry Protector
   Place an appropriately rated MOV across the AC input after the fuse to help clamp transient voltage spikes before they reach a power supply.

2. Motor Control Board Protection
   Use an MOV across an AC motor input or switching path to reduce the impact of inductive switching transients on relays, triacs, and control electronics.

3. Outdoor LED Driver Surge Suppression
   Add an MOV to the mains input of an LED driver enclosure to improve resilience against lightning-induced and utility-line surge events.

Conclusion

Bourns MOV-KC metal oxide varistors provide a compact and practical solution for protecting electronic equipment from transient overvoltage conditions. With radial-leaded construction, fast response characteristics, copper-based electrodes, and multiple voltage and disc-size options, the series is well suited for AC power entry, industrial controls, lighting products, appliances, and many other surge-sensitive electronic designs.