ComponentsThe TC-1157-B-A is a tactile switch manufactured by XKB Components. It is a through-hole component, which means it is installed by inserting its pins into plated holes in printed circuit boards (PCBs). The tactile switch is RoHS compliant, meaning that it is designed to be environmentally friendly and does not contain hazardous materials such as lead. This switch is composed of a flat bottomed cap and body. The body houses the contact tab-shaped domes which come in contact when pressed. This part is designed to provide a short, momentary contact when pressed, allowing for signal changing applications. The switch requires a minimum of 0.175N force to activate. The switch is an SPST (single pole, single throw) type, and is rated for 3 A/125 VAC and 6 A/28 VDC. Its total travel is 0.30mm and the actuator travel is 0.10mm. The switch is rated at a mechanical life of 100,000 cycles and is made from Polyester Polyamide 6.6 (UL 94V-2).