B72210S0381K351 Circuit Protection

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The B72210S0381K351 is a Varistors - also known as voltage Dependent Resistor (VDR) - designed to protect electrical circuits against overvoltages and transients. This type of protection is especially important for sensitive electronic equipment, such as computers and communication devices. The B72210S0381K351 is rated for an operating voltage of 200 volts, with a 20 amps surge current rating. It also has an insulation rating of 250 volts and a break-down voltage of 890 volts.

Application Field

A Varistor, such as the B72210S0381K351, is used to protect electronic circuits from transients or overvoltages. These transients can be caused by many sources, such as power surges, electrostatic discharge (ESD), or lightning strikes. In such cases, a varistor can short-circuit and divert the surplus voltage from the circuit, protecting it from damage.

The B72210S0381K351 is typically used in industrial, home automation, and consumer electronics applications. It is also used in automotive and railway applications, as well as in military and aerospace systems.

Working Principle

The B72210S0381K351 works by acting as a short-circuit when the voltage across it exceeds its rated voltage. This is known as the “breakdown” voltage. When the voltage across the B72210S0381K351 reaches or exceeds its breakdown voltage, current is diverted away from the sensitive components of the circuit, protecting them from damage or destruction.

When the overvoltage is removed, the B72210S0381K351 will restore itself to its normal, non-conducting state, allowing the circuit to continue functioning as normal. This makes the B72210S0381K351 an ideal choice for protecting sensitive electrical components in industrial, automotive, and other applications.

Conclusion

The B72210S0381K351 is a Varistor designed for protection against overvoltages and transients. It is rated for an operating voltage of 200 volts, with a 20 amp surge current rating, and has an insulation rating of 250 volts and a break-down voltage of 890 volts. It is used in a variety of applications, including industrial, automotive, home automation, and consumer electronics. It works by short-circuiting and diverting the surplus voltage away from the sensitive components of the circuit when the voltage across it is greater than its breakdown voltage, protecting those components from damage or destruction.

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