Behaviour – Efuse is tripped

What to do if EFUSE is tripped

Please note: Due to the speed and precise switching threshold of the EFUSE, you may find that the start-up current of your device causes the EFUSE to unintentionally trip when it is first switched on with the EFUSE attached. It is therefore advisable to select a version of the EFUSE with double the rated value of your device fuse. Despite the higher value, your device will still be much better protected than when using a conventional fuse. The value of the conventional fuse, also known as the interrupting rating, is stamped onto the metal cap, e.g. F 300 mA. The “F” here stands for “flink” (German for “swift”) and indicates that it is a fast-blow fuse. By contrast, “T” for “träge” (German for “sluggish”) is stamped onto a slow-blow fuse. The rating of the fuse is indicated behind this. In our experience, a 1A fuse is adequate for small devices. Medium-sized CD players and preamplifiers with generously sized power packs sometimes need a 2A fuse and high-performance amplifiers require 4A. If the EFUSE is sti tripped, it must be assumed that the internal design of your device is causing an unusually high startup current. In this case, we recommend using our EFUSE start-up current limiter, which restricts the current consumed during the start-up procedure to an acceptable level.