1.1 Scope
This Part specifies requirements for expulsion fuses designed for use outdoors or indoors on alternating current systems of 50 Hz, and of rated voltages exceeding 3 kV.
Expulsion fuses are classified according to the Transient Recovery Voltage (TRV) capability in classes A, B and C.
This Part covers only the performance of fuses, each one comprising a specified combination of fuse-base, fuse-carrier, and fuse-link which have been tested in accordance with this Part; and successful performance of other combinations cannot be implied from this Part.
This Part may also be used for non-expulsion fuses in which the interruption process waits for natural current zero to clear the circuit.
Note 1: See Chapter 3 and Chapter 10 for specific information regarding the selection of fuse class.
Note 2: Fuses required for the protection of capacitors and for transformer circuit applications are subject to additional requirements (see GB/T 15166.4-2008 or GB/T 15166.5-2008).
Note 3: This standard does not cover load-switching nor fault-making capabilities.
Note 4: This standard does not cover aspects related to the level of noise, nor the emission of hot gases inherent to some types of expulsion fuses during the process of interruption of fault currents.
