Switching element with locking mechanism HST® M is used on machines with run-down time. The key can be removed only if a signal from the machine control is present that the dangerous movement has stopped. An illuminated pushbutton indicates the standstill. You have to press this button to remove the key. Turning the key activates a rotary switch with selectable contact configuration. The HST® M is supplied as a panel version (as shown) or in metal case. Versions with one and two locks are available.