4. Current limiting fuses: MV current limiting fuses are primarily used in protection of transformers, motors and other loads. This is a device that, by the fusing of one or more of its specially designed and proportioned components, opens the circuit in which it is inserted when this exceeds a given value for a sufficient time.
Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10 horsepower motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor s efficiency tends to decrease dramatically below about 50% load.
01/06/1995· Taking a closer look at the time delay fuse, by industry standards it must be able to hold five times its rating for at least 10 sec. In this case it would be able to hold 11 times the full load current for a full 10 sec. The same fuse will hold eight times its rating for 2.3 sec.
If you are proficient with a volt ohm ammeter, continue. . Do not leave this circuit on with excessive amp draw. This will save on fuses.
June 10, 2020
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