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NH (H.R.C) Fuses

NH (H.R.C) Fuses
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Catalog excerpts

Selective Protection (Selectivity) 2 Super Flink NH Fuses 3 NH Fuse Order Codes and Technical Drawings 4 Tempereture Effect on NH Fuses 5 Mounting Position Relative Humidity Ambient Temperature

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Fuse is a protective device and it breaks current when the wire inside melts and protects its circuit against over current risks. Federal NH fuse and fuse base are manufactured in accordance with CE. Federal NH fuses are manufactured of steatite material and capable of breaking short circuit currents up to 120 kArms. Federal Electric NH fuses with rated up to 630A protect several devices and facilities such as transformer, cable, switch panel against overloading and short circuit safely. Current-time characteristics of fuses are seen in Figure-6. These curves indicate opening duration (t)...

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Selective protection (selectivity): It is the method of design to ensure elimination of a failure (fault), which occurs at any point of the network, by the protection element on that faulty operating element and to allow other sections of the system to continue operation. NH fuse, which have a nominal current difference of 60% according to "gL/gG" operating class, should open the circuit selectively in high short circuit currents. NH fuses should be chosen according to the table in Figure-3 in order to ensure o three phase, selective at 380 V. * three phase, selective at 500 V. Expected...

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Loading current (rms value). Current-time characteristic of NH fuses "gL/gG" Loading current Current-time characteristic of super flink NH fuses "gR" Super Flink NH Fuse: These are fuses used in protection against over current and short circuits of AC and DC power circuits, where power electronic elements such as diode, thyristor are present. The most important feature discriminating super flink fuses from NH type fuses is the material type of the melting wire used inside the NH fuse. Pure silver material is used as the melting wire in super flink fuses. As it can be seen in current-time...

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Order code Size amper value amper value amper value amper value amper value amper value amper value

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Dual Indicator Order Code amper value amper value amper value Example: Rated current of 100 A NH fuse at 50°C is found as 100 x 0.92 = 92 A according to table.

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Order code □ C- with screw □ K- with Clemens □ X-with screw and Clemens Rated current Order code □ C- with screw □ K- with Clemens □ X-with screw and Clemens Rated current

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