This is a Danfoss HSSQLY-1 High-speed Safety Switch. It is a compact, surface-mounted switch designed to provide a safe and reliable emergency stop switch for machines and systems. It is suitable for a wide range of applications, including emergency shut-down of machines, systems, and processes. It features manual activation, three normally opened and three normally closed contacts, dual safety contacts, and a tamper-proof locking device. It has an actuator lever with a maximum travel distance of 25mm and an adjustable release force of 10-125N. The housing of this switch is made of polyester, and it is IP65 and IP67-rated for dust and water ingress.