For use with and without time delay, with 4-wire bus cabling in Hi-O Technology|Emergency open module for controlling and monitoring electrical locking elements along escape and rescue routes, approved in accordance with EltVTR for the basic function without time delay.|The time delay that differs from this is tested in accordance with the specifications of DIN EN 13637:2015 (Electrically controlled escape door systems for doors in escape routes) in accordance with EN 61508 Safety Integrity Level 2 (SIL2).|In accordance with current building law, approval from the responsible building inspectorate is mandatory for use with time delay.