B72220S0170K551 Circuit Protection

Varistor Voltage (Typ):	27V
Package / Case:	Disc 20mm
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 105°C (TA)
Capacitance @ Frequency:	15600pF @ 1kHz
Number of Circuits:	1
Energy:	14J
Current - Surge:	2kA
Varistor Voltage (Max):	29.7V
Series:	StandarD
Varistor Voltage (Min):	24.3V
Maximum DC Volts:	22V
Maximum AC Volts:	17V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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B72220S0170K551 is a TVS - Varistor, MOVs produced by EPCOS, which can be used in many applications, including electric motor control, relay interface, and other high current Peak Pulse Protection applications.The Varistor provides a control and regulation of voltage by using a variety of resistive elements. These elements, combined with a non-linear resistance characteristic, create a product that can protect sensitive components from overvoltage conditions, while also protecting against voltage transients and spikes.In order to understand how this Varistor works, it is important to understand the components that make up a typical varistor. The most common component of a Varistor is a dielectric material, which is typically a ceramic or polymers. The dielectric material is placed between two metal layers, which act as electrodes. When voltage is applied to the electrodes, the dielectric material creates a nonlinear resistance characteristic, whereby voltage increases and decreases following the applied voltage. When current is applied to the electrodes, the dielectric material reacts to the applied current and the non-linear resistance characteristic of the material causes the resistance to change, thus regulating the current. This is due to a displacement of charges in the dielectric material. As a result, the non-linear resistance characteristic of the material causes the current to remain constant, regardless of the applied voltage. The Varistor is especially suitable for applications with high peak current, such as switching power supplies. In these applications, a high peak current can cause system failures. The Varistor is designed to provide the necessary protection from current overshoots and transients. Additionally, because the Varistor has a non-linear resistance characteristic, it is ideal for providing protection from voltage transients and spikes.In addition to the obvious advantages related to circuit protection, the Varistor also has other important functions. For example, it can be used to reduce circuit noise by providing an appropriate damping. Additionally, it can be used to reduce EMI/RFI emissions in circuits. As a result, the Varistor is well-suited for use in industrial and consumer electronics, where compliance to EMI requirements is necessary.In summary, the B72220S0170K551 Varistor is an integral component in many applications, including electric motor control, relay interface, and other high current Peak Pulse Protection. It combines a dielectric material with two metal electrodes to form a non-linear resistance characteristic. This resistance characteristic enables the Varistor to provide protection from overvoltage conditions, as well as from voltage transients and spikes. Additionally, it can reduce circuit noise and EMI emissions, making it suitable for use in industrial and consumer electronics.

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