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Trapped key interlock system

Key interlocks systems are used for controlling access control to machinery and installations.
Brands
Safety key switch S
Safety key switch in enclosure SR
Solenoid controlled safety key switch in enclosure MSSR
Solenoid controlled safety key switch SS1

Trapped key interlock system

Trapped key interlocking is a tried and tested method of mechanically safeguarding dangerous machines and hazardous processes by releasing or trapping coded keys in a pre-determined order.