The LITTELFUSE 57020-000 Mini Firecracker sensor is a magnetically operated switch offering a compact and reliable solution for position, limit, security, and level sensing applications. Its hermetically sealed contacts ensure long-term operation even in harsh environments. The sensor's ability to operate through non-ferrous materials like wood, plastic, and aluminum expands its versatility. It features a normally open contact and is available with various customer options including sensitivity, cable length, and termination types. This sensor is ideal for linear actuators and other applications requiring a robust and dependable proximity sensing solution.