The mechanical safety switches in the SMS 2000, SMS 3000 and SMS 4000 series are suitable for the reliable position monitoring of movable guards (EN 60947-5-3).
If the associated guard on the machine is opened, the hazardous machine movement is switched off.
In addition to 3 physical sizes, the extraction force of the actuator can be selected to acoomodate smaller or heavier doors or to prevent nuisance trips in machine with high shock and vibration.The SMS line is complemented by a range of actuators to accomodate larger forces, smaller doors, and applications where alignement issues may occasionally arise.
More: http://www.wieland-safety.com/feature/sensors/interlock-switches