Contacts are the devices that tell an alarm panel when an entryway is open or closed. The act of opening or closing an entryway, such as a door or window, causes a physical change in the contact. This in turn changes the state of the circuit to which it is connected.
In this note, we will examine and compare:
- Reed switches - Form A vs B vs C
- Surface mount magnetic contacts
- Recessed magnetic contacts
- Wide gap magnetic contacts
- High security magnetic contacts
- Plunger contacts