The 271KD05J varistor is a radial-leaded, bi-directional over-voltage protection device manufactured by Yageo. It is a non-linear semiconductor device with a voltage dependent resistance that can automatically clamp and limit voltage transients. The device is housed in a through hole package, and is RoHS compliant. The device has a DC breakdown voltage of 5 volt, an AC volt-ampere rating of 600VAC, 40A and a capacitance of 270pF. The varistor can be used to protect circuits against over-voltage conditions in a wide variety of applications, such as power supplies, communications, automotive, and computing.