The Banner SI-MAG Non-Contact Magnetic Safety Interlock Switch is a magnetically operated position switch based on reed contact technology. It is a two-piece coded magnetic field safeguarding device. And the switching function is triggered by a permanent magnet approaching the active face or side. The operating distance depends on the size, strength, and direction of the actuating magnet and on the sensitivity of the reed contact. It is used to monitor the position of a guard to detect its movement, opening, or removal. A "guard" can be a gate, door, cover, panel, barrier or other physical means that separates an individual from a hazard. Safety switches will issue a signal to the machine control system to prevent or stop (halt) hazardous situations when the guard is not in the proper position.

Coded magnets minimize the risk of intentional defeat
Maximum switching voltage is 170 V DC and 120 V AC
Maximum switching current is 400 mA DC and 280 mA AC
Operating frequency is 1 Hz
Sealed components resist water and dirt
Switching capacity is 0.25 VA
Switching elements are three pole-stable reed switches