ALLCONNE

Varistors and surge-protection components

About the manufacturer

ALLCONNE International is a manufacturer of electronic components intended to protect circuits against overvoltage events. The company’s technical documentation focuses primarily on metal-oxide varistors from the MYG series, designed to limit short-duration voltage surges in power supplies as well as consumer and industrial electronics.

A varistor is a voltage-dependent resistor. Under normal operating conditions it has little effect on the circuit, but once a defined voltage level is exceeded, its conductivity rises sharply and helps divert surge energy. This limits the voltage reaching more sensitive electronic components.

The MYG family includes devices with different disc diameters, varistor voltages, continuous operating voltages and energy-handling capabilities. This makes it possible to select protection for both compact electronic devices and circuits exposed to higher surge currents.

In practice, this type of component is widely used as a simple and cost-effective protection element at power inputs, in power supplies, controllers and equipment connected to mains or long cabling where switching transients and impulse disturbances may occur.

Applications

ALLCONNE varistors are primarily intended to protect equipment against short-duration overvoltage and voltage impulses. Typical application areas include:

– mains power supplies and converters – limiting surges appearing at the power input;

– industrial automation – protecting controllers, I/O modules and actuator electronics;

– home appliances and consumer electronics – protecting power and control circuits;

– LED lighting – protecting drivers and power supplies against mains transients;

– telecommunications and communication equipment – surge protection for supply lines;

– relay, motor and inductive circuits – limiting transients generated when switching loads.

ALLCONNE products available from Maritex

The ALLCONNE range available from Maritex includes varistors for protecting electronic and power circuits against overvoltage. The portfolio includes devices from the MYG family in a range of voltage ratings and disc sizes.

Available product groups include:

– Metal-oxide varistors for surge protection.

– MYG-series devices with different varistor-voltage ratings.

– Varistors with several disc diameters matched to the required energy-handling capability.

– Components for protecting power inputs and circuits exposed to voltage impulses.

Depending on the version, ALLCONNE varistors differ in continuous operating voltage, clamping voltage, maximum surge current and energy absorption. This allows the protection device to be matched to the protected circuit and the expected disturbance level.

When selecting a varistor, the key parameters are the circuit’s maximum operating voltage, varistor voltage, clamping level, surge-current rating and energy capability. The component should remain inactive during normal operation while reacting quickly enough when a surge occurs.

Fuses