The 25E561K Varistor with Through Hole RoHS manufactured by COV is a ceramic disc component with a lead that acts as a voltage-dependent non-linear resistor. It is typically used to protect circuits from transient overvoltages that can cause power surges or spikes, providing a protective circuit barrier to guard the circuit against power surges and spikes. Its radial lead construction and RoHS compliant design help to maintain a robust construction. The part features a high capacitance rating of 560pF, with a clamping voltage range of 11V-21V and a lead diameter of 8mm. Its breakdown voltage is 17V and its insulation resistance is rated over 10GO. Its features help to provide better protection from circuit, power and static surges.