Multimeter Fuse Input Protection
A common mistake is to put the test leads in the current jacks while trying to test the voltage. Small value resistors in DMMs can short-circuit the voltage source. A large current flows through the digital multimeter. If the multimeter is not adequately protected, it will not only damage the meter and circuit, but also harm the operator. In the case of high-voltage circuits (480 volts or higher), there is a greater danger.
Therefore, the digital multimeter should have a large enough current input protection fuse. Meters without current input fuses cannot be used in high energy circuits (>240V ac). Using a digital multimeter with a fuse, the fuse should have a large enough capacity.
amount to remove high-energy faults. The voltage rating of the fuse should be greater than the maximum voltage you expect. For example, one of the multimeters
The 20A, 250V fuse cannot protect the multimeter when measuring the 480V circuit. A 20A, 600V fuse can play a protective role when the multimeter measures a 480V circuit.
