Magnetic switch alarm with normally closed NC contact. The circuit is conductive (light on) when the magnet is present, and opens (light off) when the magnet is removed. Specification - Current: 0.5 A; Voltage: 100 V; Rated power: 10 W; Action distance: 40-50 mm - Cable length: 50 cm (19.7 in) - Dimensions: total size 105 x 37 x 9.7 mm, or 105 x 15.7 x 15.3 mm (L x W x H) - Material: durable zinc alloy housing for better rust resistance - Normally closed: when magnet is together the circuit is conductive (light on); when magnet disconnects the circuit is not conductive (light off) Benefits - Clear status indication: LED on when magnet is present, off when separated - Robust and durable: zinc alloy housing resists rust in typical environments - Compact options: two size variants to fit different installations - Simple integration: low current draw and low power requirement for reliable sensing Use scenarios - Home or office door/window security: mount on frame with magnet on door to monitor closed status - Cabinet, drawer, or safe status indicator: ensures you know if access is restricted or opened - Industrial equipment safety interlock: position sensing for guards or covers to verify correct assembly This design emphasizes function, durability, and straightforward installation while delivering reliable magnetic proximity sensing for monitoring and indicator purposes.