B72207U2151K501

TVS - Varistors, MOVs

The B72207U2151K501 is a varistor commonly used in applications that require overvoltage and overcurrent protection. Varistors, or metal-oxide varistors (MOVs) are passive components that are actively used in electrical protection. A varistor is a voltage-dependent semiconductor device that is characterized by a nonlinear, symmetrical voltage-current (VI) curve with a negative resistance. Varistors are used to protect sensitive electrical components from damage due to overvoltage, overcurrent, and transient surges.

Varistors, like the B72207U2151K501, are typically made of two layers of zinc oxide (ZnO) crystals sandwiched between two electrodes. The ZnO layers act as a dielectric between the two electrodes, providing the electrical insulation needed. The ZnO layers are wired to the terminals, and when a voltage is applied across the terminals, the voltage is transferred to the ZnO layers. When a voltage is applied, the ZnO layers become “electrically active” and develop an electric field that is proportional to the applied voltage.

The B72207U2151K501 is a two terminal component rated for a voltage between 71V and 315V and is designed to limit overvoltage transients on equipment such as computers, control systems, and measuring systems. It has a special non-linear resistive character that can limit peak voltages and currents to acceptable levels. The B72207U2151K501 is designed to provide maximum protection to sensitive electrical components against overvoltage transients due to surges, lightning, and electromagnetic interference.

The B72207U2151K501 is used in applications where it is necessary to protect critical components against power spikes and surges. It is typically used in combination with an additional protection circuit such as a fuse, TVS diode, or snubber circuit. It can be used to protect low or medium voltage DC and AC circuits. The B72207U2151K501 also has a low leakage current, which ensures that it will not drain the circuit of power when not in use.

In applications where the B72207U2151K501 is used in combination with other protection circuits, it is important to consider the VI curve of the varistor. The VI curve of a varistor is the plot of the operating voltage and the operating current. The VI curve is non-linear in shape and shows the relationship between the applied voltage and the current passing through the varistor. For the B72207U2151K501, the VI curve is symmetrical, meaning that the resistance is the same at both low and high voltages.

The B72207U2151K501 is designed to protect sensitive electrical components against overvoltage transients. It is typically used in combination with other components to protect against power spikes and surges. The varistor’s non-linear resistive characteristic limits peak voltages and currents to acceptable levels, protecting the circuit from damage. The B72207U2151K501 is an essential component in many overvoltage protection applications.