Iec 60269 1 pdf

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This engineering-related article is a stub. You can help Wikipedia by expanding it. This page was last edited on 5 January 2018, at 01:07. In electrical engineering, IEC 60269 is a set of technical standards for low-voltage power fuses. In IEC standards, the replaceable element is called a fuse link and the assembly of fuse link and fuse holder is called a fuse.

North American standards call the replaceable element only the fuse. IEC 60269 unifies the electrical characteristics of fuses that are dimensionally interchangeable with fuses built to earlier British, German, French or Italian standards. The standard identifies application categories which classify the time-current characteristic of each type of fuse. The application category is a two-digit code.

The first letter is g if the fuse is intended to operate even with currents as low as those that cause it to blow in one hour. These are considered general-purpose fuses for protection of wires. Fuses of the same application category can be substituted for each other provided the voltage rating of the circuit does not exceed the fuse rating. The designation of a size consists of the letter D and a Roman numeral.

In some jurisdictions, replacement of the fuse cartridge by unskilled personnel is allowed only for fuses up to a certain maximum rating. If the fuse cartridge is inserted into the socket without the cap, a shock hazard exists. Fuseholders may be secured by screws to a panel, attached to bus bars, or mounted on DIN rails. For the Neozed fuses, there are also fuse bases with integrated disconnecting switches. Changing fuses with the circuit off increases the safety of the user. With new versions of these load disconnecting switches, the fuse cartridges are no longer screwed, but are held by spring clips. Traditional diazed fuse holders are made as a conducting metal envelope covered with non-conducting porcelain cover.