Magnetic contacts are used to detect the opening of doors, windows, etc. The B-21 sealed magnetic contacts with flange are designed for recessed mounting. The contacts are supplied with a magnet holder, which allows the contacts to be mounted in hard-to-reach places. The contacts are offered in white (B-21) and brown (B-21 BR) colour versions.

- recessed mounted
- medium-sized sealed body with a square flange
- body diameter of 6.5 mm
- flange side length of 10 mm