Residential Electric Door and Gate Operators Commercial-Industrial Trolley type-ceilling, Wall Mounts, B1-Parting, Sliding Doors Electric Operators Waterproof Trolley Type-Ceillling and Jack-Shaft-Wall Mount Explosion-proof Trolley Type-Ceillling and Jack-Shaft-Wall Mount Sliding Gate Electric Operators Swing Gate Electric Operators Trafic control barriers To control of vehicular traffic in private and public parking areas. Rolling &Fire Doors Rolling Service Doors & Fire Doors. Jack Shaft - Wall Mount Accessories Different accessories for your needs Safety Devices Reverse Systems and Sensor Entry-Exit Devices Loop Detectors, Card Reader and more Operating Controls   Modifications   Special applications   Electric Thru-Bolt Interlock Switch This Thru-Bolt Side-lock is engaged to locking position on any upward acting door, this interlock switch will "CUT-OFF" power to push button or any other electrical devices, thus preventing damage to door, if opening devices are energized accidentally while thru-bolt side lock is still in locking position. Operating voltage: 24V A.C. or 120V A.C. Part No. 50345