This item is proudly manufactured and/or assembled in the United States of America.
Open or Closed Loop?
When the magnet is next to the switch, the contacts are closed. This is by far the most common type of alarm switch. (AKA: Normally Closed.)
When the magnet is next to the switch, the contacts are open. Uncommon for alarms, more common for access control and automation. (AKA: Normally Open)
GRI's 4400 Switch Series is a heavy duty surface mounted industrial grade contact. A weather resistant rugged aluminum housing and a variety of optional mounting brackets make it ideal for securing chain link gates, overhead garage doors, safes or walk-in freezer doors. Kits include hardware, brackets and mounting instructions.