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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 ...
In electrical engineering, IEC 60269 is a set of technical standards for low-voltage power fuses. [1] The standard is in four volumes, which describe general requirements, fuses for industrial and commercial applications, fuses for residential applications, and fuses to protect semiconductor devices.
An assortment of thermal fuses. A thermal cutoff is an electrical safety device (either a thermal fuse or thermal switch) that interrupts electric current when heated to a specific temperature. These devices may be for one-time use (a thermal fuse), or may be reset manually or automatically (a thermal switch).
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. Low voltage ...
11:29, 7 May 2017: 870 × 520 (83 KB) Havarhen: More fixes, the blade on the side view of the low-profile mini fuse was converted from a rectangle to a path. 11:19, 7 May 2017: 870 × 520 (83 KB) Havarhen: Some minor fixes: 10:54, 7 May 2017: 870 × 520 (83 KB) Havarhen: Fixed a small drawing mistake on the low-profile mini fuse, as reported by ...
Fuses for high-voltage equipment, up to 115,000 volts, are rated by the total apparent power (megavolt-amperes, MVA) of the fault level on the circuit. Some fuses are designated high rupture capacity (HRC) or high breaking capacity (HBC) [6] and are usually filled with sand or a similar material. [7] HRC fuse with red blown indication
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.
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.