Knight Fire & Security Products Ltd surface contact range is huge ! We sell the basic 2 or 5-terminal favourites, potted contacts,
mini-surface, aluminium, heavy duty, and wire/cable versions.
Our Grade 3 offerings include biased versions of many of the standard ranges, but also versions
which have selectable resistors such as YEND74 (2-reed with magnetic interference detection)
and END21 which is the same size as a standard surface.
Both can be used will all mainstream UK control panels.
For a larger G3 contact for say exit doors etc.. try the YM10