IEC 60296 PDF

The application category is a two-digit code. The first letter is a if the fuse is for short-circuit protection only; an associated device must provide overload protection. 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. The second letter indicates the type of equipment or system to be protected: D — North American time-delay fuses for motor circuits, UL fuses G — General purpose protection of wires and cables M — Motors N — Conductors sized to North American practice, UL fuses PV — Solar photovoltaic arrays as per R, S — Rectifiers or semiconductors as per Tr — Transformers[ citation needed ] Any fuses built to the IEC standard and carrying the same application category for example, gG or aM will have similar electrical characteristics, time-current characteristics, and power dissipation as any other, even if the fuses are made in the packages standardized to the earlier national standards. 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.

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The application category is a two-digit code. The first letter is a if the fuse is for short-circuit protection only; an associated device must provide overload protection. 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. The second letter indicates the type of equipment or system to be protected: D — North American time-delay fuses for motor circuits, UL fuses G — General purpose protection of wires and cables M — Motors N — Conductors sized to North American practice, UL fuses PV — Solar photovoltaic arrays as per R, S — Rectifiers or semiconductors as per Tr — Transformers[ citation needed ] Any fuses built to the IEC standard and carrying the same application category for example, gG or aM will have similar electrical characteristics, time-current characteristics, and power dissipation as any other, even if the fuses are made in the packages standardized to the earlier national standards.

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. They are available with interrupting ratings up to 50kA RMS, and are intended for use as incoming main protection from an electrical supply utility.

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. Under mechanical stress it is possible for the cover to crack partially or fully, uncovering the conducting element.

It may happen if a fuse holder was accidentally dropped or someone was using too much force to screw it in. Uncovered metal envelopes present a serious risk of shock and should be replaced immediately under extreme precautions by trained personnel. The smaller end cap the "top" of the bottle has a diameter that varies with the fuse rating: higher ratings have wider end caps.

The fixed part of the fuse holder contains a usually colour-coded gauge ring, which will accept end caps up to a certain diameter. It is therefore not possible to fit a fuse of a higher rating than allowed for by the gauge ring.

The size of the gauge ring is determined by the current rating of the circuit to be protected. Gauge rings are intended to be changed only by authorized personnel. The larger end cap the "bottom" of the bottle has at its centre a small spring-loaded button retained by a thin wire, which serves as a "fuse blown" indicator.

When the fuse blows, the wire breaks and the indicator button is ejected by the spring. A missing or displaced indicator thus pinpoints a blown fuse. The removable part of the fuse holder has a small window to allow inspection of the indicator without removal of the fuse. The indicator button usually has a coloured dot indicating the fuse rating see table.

The most common operating class is gG general purpose, formerly gL , but other classes are available. A gG class fuse will typically blow within 2—5 seconds at five times the rated current, and within 0.

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