BK1/S505H-2-R is a 2A time-delay ceramic tube fuse designed for 250 Vac / 400 Vdc applications with a 5x20mm physical size and electroplated end caps. The fuse features a typical DC cold resistance of 0.055 O and a typical voltage drop of 128 mV at rated current, with an I²t value of 11.44 A²s. It is designed to IEC 60127-2 standard and provides high breaking capacity of 1500 A at maximum voltage, with an interrupting rating of 400 A at 250 Vac. The fuse is RoHS compliant, lead-free, and halogen-free, with agency approvals including TUV, CQC, PSE/JET, and cURus. It is commonly used in power supplies, adapters, battery chargers, and consumer electronics such as desktops, notebooks, TVs, and set-top boxes.