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In electrical distribution, a fuse cutout or cut-out fuse (often referred to as a cutout) is a combination of a fuse and a switch, used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads. An overcurrent caused by a fault in the transformer or customer circuit will cause the fuse to ...
DIN 43700, was the specification by the Deutsches Institut für Normung for nominal front- and cut-out dimensions of measurement and control instruments for panel mounting. It has now been superseded by DIN IEC 61554:2002-08.
IEC 60269-7 – Low-voltage fuses – Part 7: Supplementary requirements for fuse-links for the protection of batteries and battery systems; 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.
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[7] [8] On a 3-phase circuit, a recloser is more beneficial than three separate fuse cutouts . For example, on a wye to delta conversion, when cutouts are used on the wye side and only 1 out of 3 of the cutout fuses open, some customers on the delta side have a low voltage condition, due to voltage transfer through the transformer windings .
UL 248 currently has 19 "parts". UL 248-1 sets the general requirements for fuses, while the latter parts are dedicated to specific fuses sizes (ex: 248-8 for Class J, 248-10 for Class L), or for categories of fuses with unique properties (ex: 248-13 for semiconductor fuses, 248-19 for photovoltaic fuses).
The Lucas 1/4" diameter glass tube fuse have a different length as compared to the standard US item. The Lucas 1/4" diameter glass tube fuse is 1 + 5 ⁄ 32 in (29 mm) long, while the US standard 1/4" glass tube fuse is 1 + 1 ⁄ 4 in (32 mm)] long. However, many Lucas fuse holders permit the longer US version to be installed easily.
Because standard safety fuse burns at around half a metre per minute, it is not practicable to provide delays of more than a few minutes in this way. It was also possible to connect a pencil detonator to so-called "instantaneous fuse" (not to be confused with detonating cord) which had an unusually fast burn rate of over 7 metres per second.
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