Function:24 VAC short circuit protection kit can prevent the circuit board and transformer from being damaged due to improper fuse replacement  LED Indicator Light: Equipped with a bright LED indicator, it displays the circuit status in real time, facilitating the identification of short circuit locations  Automatic Reset: Conduct continuous testing without human intervention to ensure that you can continue working without interruption  Easy To Install: The simple interface and lightweight design make it easy for users of all skill levels to use  High Quality: Made of high-quality materials, durable, compact in size, easy to carry, providing accurate readings and reliable performance for all your electrical testing needs