The guard locking device HST-TZ1 comprises a lock and slam-type locking actuator mechanism suitable forhinged doors and flaps. It can be used on misaligned and sagging doors. Inserting and trapping the coded keyin the HST-TZ1 releases the actuator allowing the door to open. If the guard locking device is used to protect access to a hazard, measures are required that secure that prior to access the hazardous movements are topped, for instance by HST-S or HST-M devices. In conjunction with other components, the guard lockingdevice HST-TZ1 is used for locking guards in precipitators, quarry machines, or power plants etc.Please note: Not allowable for hazardous areas where full-body access is possible. At guards with full-body access, a model with personal safety key must be installed, e.g. HST-TZ2.