At a glance:

General safety switch knowledge

Escape release

In the event of danger, the escape release must allow unlocking without aids from the danger area/machine side. The device must be manually operated and act positively on the locking means. The actuation must lead to a permanent blocking of the guard locking (see also auxiliary unlocking).

Emergency unlocking/emergency unlocking

Emergency unlocking is used to unlock guard locking in an emergency. Unlocking can be performed without tools from the access side/outside. During emergency unlocking, the switch engages in the unlocked position and can only be reset to the initial position with a repair-like effort.

Safety Integrity Level (SIL)

Safety Integrity Level is the level that describes the probability that a safety-related system will perform the required safety functions under all specified conditions within a specified period of time. For this purpose, the Safety Integrity Level to be achieved (SILr; the "r" stands for "required") is compared with the "actual" SIL that is achieved.

Auxiliary release

If a guard locking device fails, it can be unlocked with an auxiliary unlocking device from the access/external side. Unlocking is performed using a tool or a key. The auxiliary release should be secured against misuse (lead seal, varnish).

Performance Level (PL)

Discrete level that specifies the ability of safety-related parts of a control system to perform a safety function under foreseeable conditions (definition according to standard DIN EN ISO 13849). In simpler terms, the performance level is a measure of the reliability of a safety function. A distinction is made between the performance level to be achieved (PLr; the "r" stands for "required") and the "actual" PL that is actually achieved. There are five performance levels, which represent different residual risks.

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