Fire protection module, In addition to the UII 901IC-4, the FS module 519ZBFS is required when using motor locks on fire doors., In the event of a fire or power failure, both modules ensure that the motor lock changes from any functional state to the locked state and the door can fulfil its fire protection function. Of course, the panic function via the handle or grab bar is still available., An on-site fire alarm system or a smoke detector, e.g. model 60 030, can be connected for smoke detection.