The Model 854 Electric Switch Lock is used to securely lock the hand-throw lever of a hand-operated switch machine or ground-throw switch stand in the normal position. It provides a means of interlocking a manually operated switch with the signal circuits so that the switch may not be operated unless traffic conditions permit, or unless the normally-sealed emergency release is operated. This switch lock may be applied to ether a right or left hand layout.
The Model 854 Switch Lock has a durable cast-costruction. The relay is designed to operate at 100 ohms on 8 to 12V dc. If AC operation is required, a transformer and rectifier are required in separate housing.