Allen-Bradley 440T Prosafe Trapped Key Switch with Electronic Timed-delay

The Allen-Bradley 440T Electronic Timed-delay Unit Trapped Key Interlock Switches are ideal for applications requiring an elapsed time to occur before access to a hazardous area. Using a combination of Guardmaster® SI and Guardmaster EMD safety relays to execute the timing sequence by turning a non-removable key. When the EMD times out an internal solenoid is energised allowing the removal of either one or two trapped keys ensuring a high level of safety to a hazardous area.