A safety device is a device that is designed to protect people from harm or damage. FUSE (4 letters) is an electrical device that is designed to protect circuits from overloads by breaking the circuit when too much current flows through it. NET (3 letters) is a barrier made of rope, metal, or other material that is used to protect people or objects from danger. STRAP (5 letters) is a band or cord used to secure something in place or to keep it from moving. FIREALARM (9 letters) is an electronic device that is designed to detect smoke and alert people to the presence of a fire.