The OP1-W01-B11 Safety Switch is a fire warning hand switch manufactured by Spamel. It has OP1, NC + NO contacts and a Polycarbonate/ABS shell with an IP65 (dust and water) protection rating. This switch also utilizes a rotary action for extra safety and reliability. It is suitable for a variety of industrial and home applications, as it is designed to detect a potential fire, activate an alarm, and/or power an emergency lighting system. It also features an LED indicator to show users when the switch is in use.