The B3FS-1015 is a part of the Omron Estop Switch series. It is an emergency stop switch that is used to shut down a machine quickly in the case of an emergency. This switch is designed with a momentary contact and operates up to a 10A, 250 VAC. The case is made of dust-proof resin and is designed to meet all international safety requirements. It also has a red mushroom head, making it easy to locate and activate quickly.