The Z21D201 from Semitec is a Metal Oxide Varistor that has been designed to handle large surge currents and transient over-voltage spikes. It has an AC voltage rating of up to 130 V, a DC voltage rating of less than 170 V, and a clamping voltage of 340 V. This varistor is produced using a sintering process, which involves heating a mix of minerals based on zinc oxide to temperatures ranging from 1200 to 1400°C, resulting in high durability and stability that is capable of withstanding high levels of electrical stress. It is available in a through-hole package that measures 22.5 x 25.5 x 9.5 mm and is ideal for semiconductor protection, diodes, transistors, thyristors, ICs, home electronics protection: TVs, air conditioners, refrigerators, microwave ovens, office automation device protection: PPC copy machines, fax machines, PCs, industrial device protection: robots, boilers, machine tooling, in-rush surge protection: electromagnetic clutch/brake devices, relay control devices, short circuit breakers, automotive electrification, vending machines, and communication/broadcasting device applications.