B72280B0381K001

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The B72280B0381K001 varistor is widely used today as a proactive component in electrical and electronic circuits, for shielding from high transient voltage surges and spikes. Different sizes and values of varistors are available in the market, and B72280B0381K001 is one among them used for high impact surge currents applications over a wide range of frequencies.

Application Field

B72280B0381K001 is mainly used in electrical circuits such as audio-visual equipment, communications equipment, power supplies, communication lines and a variety of high-frequency set-ups. They are used to protect circuits from overvoltage surges due to electrostatic discharge (ED), lightning strikes, high power switching operations or other causes. The varistor also provides a protective shield to devices from short and over-currents, thus preventing permanent damage.

It can be used between the mains switch and the AC terminal of a device, or directly on a circuit board for better performance. As it requires some current to be conducted for its protective work, its connection must be able to conduct current. The varistor also provides protection against ground faults.

Working Principle

The B72280B0381K001 works by conducting the excess current away from the device to the ground. This varistor is made of a “metal-oxide-semiconductor” (MOS) which is also known as a diac (diode-like component). Enclosing it in an enclosure, it normally has two pins, providing an electrical connection between the device and the ground. It works by quickly diverting electric current away from the circuit, once the current reaches an unsafe level.

Normal working current of B72280B0381K001 is between 5mA to 100mA. In case of an overload condition beyond this limit, the varistor rapidly pushes the current to an extremely low level, thus preventing the circuit from enduring any damage due to excessive current.

A surge suppressor works in the same way as a varistor, but it is designed to allow smooth passage of current at all times except when excessive current is detected by it. In such cases, the surge suppressor momentarily eliminates the current from the circuit.

The B72280B0381K001 Varistor is widely used in modern electrical appliances as a proactive component that helps to protect the circuit from short-term voltage surges. With its higher DC rating, it is suitable for use in many high frequency circuits. Its fast response time and steady current limit make it a great choice for controlling transient erosion of the circuit.

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