A bell switch with an indicator is an upgraded version of the bell-switch. The mechanism used is the same along with some added features. A??bell switch of this category comes in a pack of 10 pieces. In includes a contact plate that is made of phosphor bronze to??ensure high productivity and low voltage drop. In most cases, it is also nickel coated to prevent dust from accumulating. It incorporates IP??20 protection to guard against accidental fire.