Have some common sense of toggle switches

When choosing a switch, in addition to considering the shape, but also consider the parameters, especially to pay attention to voltage, rated current and contact resistance.

The easiest way to check the band switch is to use the minimum ohm file of a digital multimeter to measure the contact resistance between the pole and the bit at the connected position. When detecting, the switch should be rotated or toggle several times, and the insulation resistance value between several knives and bits should be detected.