Safety Switch and Trapped Key Interlock
Safety switch with locking
Electromechanical solenoid locking units prevent the opening of access or safety gates, until a hazardous area can be entered.
Electromechanical safety switches with a solenoid locking unit secure that safety gates and – covers as well as other safe guards will remain closed, as long as there is a dangerous state or a risk of injury to persons. For example with safety applications like overrun movements of a machine, high temperatures or systems which are under high pressure (pneumatic, hydraulic etc.).
An access can only be opened after a release signal was given from the machine control to the locking unit. As long as the signal continues, the movable part of the safe guard can be opened and closed. If no signal applies and the safe guard is closed, the interlock unit will be activated again and the machine can be restarted again.
There are two different types of interlock units: on the one hand the spring powered interlocking (quiescent current) and on the other hand the magnetic locking of interlock units (operating current).
Current datasheets to download as PDF-file
Safety switch design 2 with locking | ||
| Function | Description | Download |
|---|---|---|
| Guard locking switch | The actuator can be removed after a release signal is present | STS- |
| Guard locking switch with optional key release | The key is released after a release signal is present and the actuator has been removed | STS- |
| Guard locking switch with key | The actuator is released after a release signal is present and the key is removed | STS- |
| Key- |
The key can be removed after a release signal is present | STS- |