FD 21R2-L20F3 - Metal Safety Interlock Switch with Mechanical time delay lockThe FD 21R2 L20F3 is a highly durable safety interlock switch designed to provide reliable access control for industrial machinery. Featuring a robust metal housing and a manual mechanical delay 20 seconds (long knob) lock style, this switch ensures that hazardous equipment remains secure during operation. It comes equipped with 3nc safety contacts for dependable safety circuit integration and utilizes a standard m20x1. 5 conduit entry connection type