Magnetic contactors are electromagnetically operated switches that provide a safe and convenient means for repeatedly making and breaking branch circuits. The principal difference between a contactor and a motor starter is that contactor does not contain overload relays. Contactors are used to switch, with pilot control device, such loads as lighting, heating and controlling electric motors where overload protection is [...]
Air switches are classified as air-break switches and isolators (or disconnect switches). (i) Air-Break Switches: The air-break switch has both the blade and the contact equipped with arcing horns. Arcing horns are pieces of metal between which the arc resulting from opening a circuit carrying current is allowed to form. As the switch opens, these horns are spread farther and [...]
In this article we will discuss about the use of various types of switches for domestic and commercial purposes. Use of Single-Pole and Double-Pole Switches: A single-pole switch may be used in a circuit in which normally the current does not exceed 5 amperes. Where the current exceeds 5 amperes, the practice is to use a double-pole switch there. When [...]