Jun. 26, 2018
First, the general fuse selection:1 Conductor protection (gG/gL characteristics): Overcurrent and short-circuit current in the line will cause the conductor and cable temperature to be too high, which will cause insulation damage and even breakage of the conductor and cable. The fuses for the overload protection of the conductors and cables can be arranged at the incoming end or outgoing end of the conductors and cables. The rated current of the fuse is approximately 1.25 times of the line current; the fuses must be installed at the incoming end of the conductors and cables for short-circuit protection. The rated current of the fuse is approximately 1.45 times the trip current.2 Motor protection (aM/gM characteristics): A simple motor circuit is usually composed of fuses, contactors, thermal relays, motors, etc. According to experience, in this circuit, the rated current of the fuse is selected to be approximately 1.2 to 1.5 times the rated current of the motor.3 Capacitor switch equipment protection: In the capacitor switchgear, the fuse is stored for short circuit protection and the rated current of the selected fuse is not to be less than 1.6 times the rated current of the capacitor.