This unit is designed to make the installation of FAIL SAFE security interlock (airlock style) systems simple and economical.
Use of this unit ensures that one door has to be closed before another door can be released. Can be used in conjunction with monitored release or alternatively, standard door releases, alarm contacts and push-buttons can be used, eliminating the necessity for expensive monitored releases.
The relay is housed in a small relay box (SLPB3)
Relay box dimensions: 103 x 81 x 32mm